park assist DODGE TOWN AND COUNTRY 2004 Service Manual

ence these symptoms, try another brand of gasoline
before considering service for the vehicle.
Over 40 auto manufacturers world-wide have
issued and endorsed consistent gasoline specifications
(the Worldwide Fuel Charter, WWFC) to define fuel
properties necessary to deliver enhanced emissions,
performance and durability for your vehicle. We rec-
ommend the use of gasolines that meet the WWFC
specifications if they are available.
REFORMULATED GASOLINE
Many areas of the country require the use of
cleaner burning gasoline referred to as ªreformu-
latedº gasoline. Reformulated gasoline contain oxy-
genates, and are specifically blended to reduce
vehicle emissions and improve air quality.
We strongly support the use of reformulated gaso-
line. Properly blended reformulated gasoline will pro-
vide excellent performance and durability for the
engine and fuel system components.
GASOLINE/OXYGENATE BLENDS
Some fuel suppliers blend unleaded gasoline with
oxygenates such as 10% ethanol, MTBE, and ETBE.
Oxygenates are required in some areas of the country
during the winter months to reduce carbon monoxide
emissions. Fuels blended with these oxygenates may
be used in your vehicle.
CAUTION: DO NOT use gasoline containing METH-
ANOL. Gasoline containing methanol may damage
critical fuel system components.
MMT IN GASOLINE
MMT is a manganese-containing metallic additive
that is blended into some gasoline to increase octane.
Gasoline blended with MMT provide no performance
advantage beyond gasoline of the same octane num-
ber without MMT. Gasoline blended with MMT
reduce spark plug life and reduce emission system
performance in some vehicles. We recommend that
gasoline free of MMT be used in your vehicle. The
MMT content of gasoline may not be indicated on the
gasoline pump; therefore, you should ask your gaso-
line retailer whether or not his/her gasoline contains
MMT.
It is even more important to look for gasoline with-
out MMT in Canada because MMT can be used at
levels higher than allowed in the United States.
MMT is prohibited in Federal and California refor-
mulated gasoline.
SULFUR IN GASOLINE
If you live in the northeast United States, your
vehicle may have been designed to meet California
low emission standards with Cleaner-Burning Cali-fornia reformulated gasoline with low sulfur. If such
fuels are not available in states adopting California
emission standards, your vehicles will operate satis-
factorily on fuels meeting federal specifications, but
emission control system performance may be
adversely affected. Gasoline sold outside of California
is permitted to have higher sulfur levels which may
affect the performance of the vehicle's catalytic con-
verter. This may cause the Malfunction Indicator
Lamp (MIL), Check Engine or Service Engine Soon
light to illuminate. We recommend that you try a dif-
ferent brand of unleaded gasoline having lower sulfur
to determine if the problem is fuel related prior to
returning your vehicle to an authorized dealer for
service.
CAUTION: If the Malfunction Indicator Lamp (MIL),
Check Engine or Service Engine Soon light is flash-
ing, immediate service is required; see on-board
diagnostics system section.
MATERIALS ADDED TO FUEL
All gasoline sold in the United States and Canada
are required to contain effective detergent additives.
Use of additional detergents or other additives is not
needed under normal conditions.
FUEL SYSTEM CAUTIONS
CAUTION: Follow these guidelines to maintain your
vehicle's performance:
²The use of leaded gas is prohibited by Federal
law. Using leaded gasoline can impair engine perfor-
mance, damage the emission control system, and
could result in loss of warranty coverage.
²An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your dealer for service assistance.
²When pulling a heavy load or driving a fully
loaded vehicle when the humidity is low and the tem-
perature is high, use a premium unleaded fuel to
help prevent spark knock. If spark knock persists,
lighten the load, or engine piston damage may result.
²The use of fuel additives which are now being
sold as octane enhancers is not recommended. Most
of these products contain high concentrations of
methanol. Fuel system damage or vehicle perfor-
mance problems resulting from the use of such fuels
or additives is not the responsibility of
DaimlerChrysler Corporation and may not be covered
under the new vehicle warranty.
RSLUBRICATION & MAINTENANCE0-5
FLUID TYPES (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
SCRAPING (METAL-TO-
METAL).1. Foreign object interference with
brakes.1. Inspect brakes and remove foreign
object.
2. Brake shoes worn out. 2. Replace brake shoes. Inspect rotors and
drums. Reface or replace as necessary.
OTHER BRAKE CONDITIONS
CONDITION POSSIBLE CAUSES CORRECTION
BRAKES CHATTER 1. Rear brake drum out of round or
disc brake rotor has excessive
thickness variation.1. Isolate condition as rear or front.
Reface or replace brake drums or
rotors as necessary.
BRAKES DRAG (FRONT
OR ALL)1. Contaminated brake fluid. 1. Check for swollen seals. Replace all
system components containing rubber.
2. Binding caliper pins or bushings. 2. Replace pins and bushings.
3. Binding master cylinder. 3. Replace master cylinder.
4. Binding brake pedal. 4. Replace brake pedal.
5. Brake lamp switch not adjusted
properly and mounting bracket is
bent.5. Straighten mounting bracket and
replace brake lamp switch.
BRAKES DRAG (REAR
ONLY)1. Parking brake cables binding or
froze up.1. Check cable routing. Replace cables
as necessary.
2. Parking brake cable return spring
not returning shoes.2. Replace cables as necessary.
3. Service brakes not adjusted
properly (rear drum brakes only).3. Follow the procedure listed in the
adjustment section.
4. Rear disc brake parking brake not
properly adjusted.Adjust parking brake shoes.
BRAKES GRAB 1. Contaminated brake shoe linings. 1. Inspect and clean, or replace shoes.
Repair source of contamination.
2. Improper power brake booster
assist.2. Refer to power brake booster
diagnosis and testing.
EXCESSIVE PEDAL
EFFORT1. Obstruction of brake pedal. 1. Inspect, remove or move obstruction.
2. Low power brake booster assist
(vacuum leak).2. Refer to power brake booster
diagnosis and testing.
3. Glazed brake linings. 3. Reface or replace brake rotors as
necessary. Replace brake shoes.
4. Brake shoe lining transfer to brake
rotor.4. Reface or replace brake rotors as
necessary. Replace brake shoes.
EXCESSIVE PEDAL
TRAVEL (VEHICLE STOPS
OK)1. Air in brake lines. 1. Bleed brakes.
2. Rear drum brake auto-adjuster
malfunctioning.2. Inspect and replace drum brake
components as necessary. Adjust rear
brakes.
5 - 6 BRAKES - BASERS
BRAKES - BASE (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
EXCESSIVE PEDAL
TRAVEL (ONE FRONT
WHEEL LOCKS UP
DURING HARD BRAKING)1. One of the two hydraulic circuits
to the front brakes is malfunctioning.1. Inspect system for leaks. Check
master cylinder for internal malfunction.
PEDAL PULSATES/
SURGES DURING
BRAKING1. Rear brake drum out of round or
disc brake rotor has excessive
thickness variation.1. Isolate condition as rear or front.
Reface or replace brake drums or
rotors as necessary.
PEDAL IS SPONGY 1. Air in brake lines. 1. Bleed brakes.
2. Power brake booster runout
(vacuum assist).2. Check booster vacuum hose and
engine tune for adequate vacuum
supply. Refer to power brake booster
diagnosis and testing.
PREMATURE REAR
WHEEL LOCKUP1. Contaminated brake shoe linings. 1. Inspect and clean, or replace shoes.
Repair source of contamination.
2. Inoperative proportioning valve
(non-ABS vehicles).2. Refer to proportioning valve
diagnosis and testing. Replace valve as
necessary.
3. Improper power brake booster
assist.3. Refer to power brake booster in the
diagnosis and testing section.
STOP/BRAKE LAMPS
S TAY O N1. Brake lamp switch out of
adjustment.1. Replace brake lamp switch.
2. Brake pedal binding. 2. Inspect and replace as necessary.
3. Obstruction in pedal linkage. 3. Remove obstruction.
4. Power Brake Booster not allowing
pedal to return completely.4. Replace power brake booster.
VEHICLE PULLS TO
RIGHT OR LEFT ON
BRAKING1. Frozen brake caliper piston. 1. Replace frozen piston or caliper.
Bleed brakes.
2. Contaminated brake shoe lining. 2. Inspect and clean, or replace shoes.
Repair source of contamination.
3. Pinched brake lines. 3. Replace pinched line.
4. Leaking piston seal. 4. Replace piston seal or brake caliper.
5. Suspension problem. 5. Refer to the Suspension group.
PARKING BRAKE -
EXCESSIVE HANDLE
TRAVEL1. Rear drum brakes or rear disc
brake parking brake shoes out of
adjustment.1. Adjust rear drum brake shoes, or
rear parking brake shoes on vehicles
with rear disc brakes.
STANDARD PROCEDURE - BASE BRAKE
BLEEDING
NOTE: This bleeding procedure is only for the vehi-
cle's base brakes hydraulic system. For bleeding
the antilock brakes hydraulic system, (Refer to 5 -
BRAKES - ABS - STANDARD PROCEDURE)CAUTION: Before removing the master cylinder
cover, thoroughly clean the cover and master cylin-
der fluid reservoir to prevent dirt and other foreign
matter from dropping into the master cylinder fluid
reservoir.
RSBRAKES - BASE5-7
BRAKES - BASE (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
DISC BRAKE SQUEAK AT
LOW SPEED (WHILE
APPLYING LIGHT BRAKE
PEDAL EFFORT) 1. Brake shoe linings. 1. Replace brake shoes.
DRUM BRAKE CHIRP 1. Lack of lubricant on brake shoe support plate where shoes ride. 1. Lubricate shoe contact areas on brake
shoe support plates.
DRUM BRAKE CLUNK 1. Drum(s) have threaded machined braking surface. 1. Replace brake drums as necessary.
DRUM BRAKE HOWL OR
MOAN 1. Lack of lubricant on brake shoe
support plate where shoes ride and
at the anchor. 1. Lubricate shoe contact areas on brake
shoe support plates and at the anchor.
2. Rear brake shoes. 2. Replace rear brake shoes.
DRUM BRAKE SCRAPING
OR WHIRRING 1. ABS wheel speed sensor or tone
wheel. 1. Inspect, correct or replace faulty
component(s).
SCRAPING (METAL-TO-
METAL). 1. Foreign object interference with
brakes. 1. Inspect brakes and remove foreign
object.
2. Brake shoes worn out. 2. Replace brake shoes. Inspect rotors and drums. Reface or replace as necessary.
OTHER BRAKE CONDITIONS
CONDITION POSSIBLE CAUSES CORRECTION
BRAKES CHATTER 1. Rear brake drum out of round or disc brake rotor has excessive
thickness variation. 1. Isolate condition as rear or front.
Reface or replace brake drums or
rotors as necessary.
BRAKES DRAG (FRONT
OR ALL) 1. Contaminated brake fluid. 1. Check for swollen seals. Replace all
system components containing rubber.
2. Binding caliper pins or bushings. 2. Replace pins and bushings.
3. Binding master cylinder. 3. Replace master cylinder.
4. Binding brake pedal. 4. Replace brake pedal.
5. Brake lamp switch not adjusted
properly and mounting bracket is
bent. 5. Straighten mounting bracket and
replace brake lamp switch.
BRAKES DRAG (REAR
ONLY) 1. Parking brake cables binding or
froze up. 1. Check cable routing. Replace cables
as necessary.
2. Parking brake cable return spring
not returning shoes. 2. Replace cables as necessary.
3. Service brakes not adjusted
properly (rear drum brakes only). 3. Follow the procedure listed in the
adjustment section.
4. Rear disc brake parking brake not
properly adjusted. Adjust parking brake shoes.
BRAKES GRAB 1. Contaminated brake shoe linings. 1. Inspect and clean, or replace shoes. Repair source of contamination.
2. Improper power brake booster
assist. 2. Refer to power brake booster
diagnosis and testing.
RS
BRAKES5s-5
BRAKES - BASE (Continued)

LEARNED FEATURES
FEATURE LEARNING KEY
CENTRAL LOCKING (WITH VTSS ONLY) DRIVER KEY CYLINDER SWITCH PRESENT
AUTOMATIC HEADLAMPS PCI MESSAGE FROM OVERHEAD OR HEADLAMP
SWITCH POSITION (AUTO)
REMOTE KEYLESS ENTRY RKE MESSAGE RECEIVED FROM MODULE
FRONT FOG LAMPS HEADLAMP SWITCH POSITION (PARK W/FRONT
FOG LAMPS)
POWER SLIDING DOOR PCI IFR RECEIVED FROM MODULE
THE BCM HAS FOUR SWITCH INPUTS FOR THE POWER SLIDING DOOR FEATURE; LOCATED IN THE
OVERHEAD CONSOLE ARE THE LEFT AND RIGHT SIDE SLIDING DOOR SWITCHES TO ACTIVATE EITHER
OR BOTH SLIDING DOORS UNDER THE PROPER CONDITIONS. ALSO ARE B-PILLAR SWITCHES LOCATED
ON THE LEFT AND RIGHT B-PILLAR POSTS.
POWER LIFTGATE PCI IFR RECEIVED FROM MODULE
THE BCM HAS ONE LIFTGATE INPUT LOCATED IN THE OVERHEAD CONSOLE.
POWER LOCKOUT SWITCH INPUT
THE BCM HAS ONE LOCKOUT SWITCH INPUT THAT WHEN ENABLED WILL DISABLE THE B-PILLAR
SLIDING DOOR SWITCHES FROM ACTIVATING EITHER SLIDING DOOR WHEN DEPRESSED.
PCI AUDIO SYSTEM PCI MESSAGE RECEIVED FROM MODULE
REMOTE RADIO CONTROLS REMOTE RADIO SWITCHES PRESENT
VEHICLE THEFT SECURITY DRIVER DOOR CYLINDER LOCK SWITCH
MEMORY SEAT AND MIRRORS MEMORY SEAT SWITCH PRESENT AND OR PCI
MESSAGE RECEIVED FROM MEMORY MODULE
ABS W/TRACTION CONTROL PCI MESSAGE RECEIVED FROM CAB
SENTRY KEY IMMOBILIZER SYSTEM PCI MESSAGE RECEIVED FROM SKIM OR VTSS
PRESENT
ADJUSTABLE PEDAL MODULE PCI MESSAGE RECEIVED FROM ADJUSTABLE
PEDAL MODULE (APM)
When replacing a BCM there are three modules
available:
²Base
²Midline
²RG - Export
The Midline controller is used on vehicles that
have Power Door Locks. If a vehicle is equipped with
the Vehicle Theft Security System, the Midline con-
troller becomes a Premium when the theft feature is
enabled.
CAUTION: Do not swap Body Control Modules
between vehicles or body controller's off the shelf.
The BCM has internal diagnostic capability that
assists in diagnosing the system error. When an
OPEN or a SHORT circuit exists, the diagnostic tool
can be used to read the BCM faults. The faults are
very descriptive in identifying the appropriate fea-
ture that has faulted.The only two faults that the BCM logs that con-
clude the replacement of a BCM are faults;
²# 01 - Internal BCM failure (replace BCM)
²# 1F - J1850 Internal Hardware Failure (replace
BCM)
Otherwise the appropriate diagnostic procedures
for each of the features should be taken when the
BCM logs a fault.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the lower instrument panel silencer.
(3) Remove the knee blocker and reinforcement
(Refer to 23 - BODY/INSTRUMENT PANEL/KNEE
BLOCKER REINFORCEMENT - REMOVAL).
(4) Disconnect the five wire connectors from the
bottom of the Body Control Module (BCM).
(5) Move bulkhead wiring aside.
8E - 4 ELECTRONIC CONTROL MODULESRS
BODY CONTROL MODULE (Continued)

found on the original equipment battery label. Be
certain that a replacement battery has the correct
Group Size number, as well as CCA, and RC or AH
ratings that equal or exceed the original equipment
specification for the vehicle being serviced. Refer to
Battery Specificationsin this group for the loca-
tion of the proper factory-installed battery specifica-
tions.
OPERATION
The battery is designed to store electrical energy in
a chemical form. When an electrical load is applied to
the terminals of the battery, an electrochemical reac-
tion occurs. This reaction causes the battery to dis-
charge electrical current from its terminals. As the
battery discharges, a gradual chemical change takes
place within each cell. The sulfuric acid in the elec-
trolyte combines with the plate materials, causing
both plates to slowly change to lead sulfate. At the
same time, oxygen from the positive plate material
combines with hydrogen from the sulfuric acid, caus-
ing the electrolyte to become mainly water. The
chemical changes within the battery are caused by
the movement of excess or free electrons between the
positive and negative plate groups. This movement of
electrons produces a flow of electrical current
through the load device attached to the battery ter-
minals.
As the plate materials become more similar chem-
ically, and the electrolyte becomes less acid, the volt-
age potential of each cell is reduced. However, by
charging the battery with a voltage higher than that
of the battery itself, the battery discharging process
is reversed. Charging the battery gradually changes
the sulfated lead plates back into sponge lead and
lead dioxide, and the water back into sulfuric acid.
This action restores the difference in the electron
charges deposited on the plates, and the voltage
potential of the battery cells. For a battery to remain
useful, it must be able to produce high-amperage cur-
rent over an extended period. A battery must also be
able to accept a charge, so that its voltage potential
may be restored.
The battery is vented to release excess hydrogen
gas that is created when the battery is being charged
or discharged. However, even with these vents,
hydrogen gas can collect in or around the battery. If
hydrogen gas is exposed to flame or sparks, it may
ignite. If the electrolyte level is low, the battery may
arc internally and explode. If the battery is equipped
with removable cell caps, add distilled water when-
ever the electrolyte level is below the top of the
plates. If the battery cell caps cannot be removed, the
battery must be replaced if the electrolyte level
becomes low.
DIAGNOSIS AND TESTING - BATTERY
The battery must be completely charged and the
terminals should be properly cleaned and inspected
before diagnostic procedures are performed. Refer to
Battery System Cleaning for the proper cleaning pro-
cedures, and Battery System Inspection for the
proper battery inspection procedures. Refer to Stan-
dard Procedures for the proper battery charging pro-
cedures.
MICRO 420 BATTERY TESTER
The Micro 420 automotive battery tester is
designed to help the dealership technicians diagnose
the cause of a defective battery. Follow the instruc-
tion manual supplied with the tester to properly
diagnose a vehicle. If the instruction manual is not
available refer to the standard procedure in this sec-
tion, which includes the directions for using the
Micro 420 battery tester.
WARNING: IF THE BATTERY SHOWS SIGNS OF
FREEZING, LEAKING OR LOOSE POSTS, DO NOT
TEST, ASSIST-BOOST, OR CHARGE. THE BATTERY
MAY ARC INTERNALLY AND EXPLODE. PERSONAL
INJURY AND/OR VEHICLE DAMAGE MAY RESULT.
WARNING: EXPLOSIVE HYDROGEN GAS FORMS IN
AND AROUND THE BATTERY. DO NOT SMOKE,
USE FLAME, OR CREATE SPARKS NEAR THE BAT-
TERY. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT.
WARNING: THE BATTERY CONTAINS SULFURIC
ACID, WHICH IS POISONOUS AND CAUSTIC. AVOID
CONTACT WITH THE SKIN, EYES, OR CLOTHING.
IN THE EVENT OF CONTACT, FLUSH WITH WATER
AND CALL A PHYSICIAN IMMEDIATELY. KEEP OUT
OF THE REACH OF CHILDREN.
A battery that will not accept a charge is faulty,
and must be replaced. Further testing is not
required. A fully-charged battery must be tested to
determine its cranking capacity. A battery that is ful-
ly-charged, but does not pass the Micro 420 or load
test, is faulty and must be replaced.
NOTE: Completely discharged batteries may take
several hours to accept a charge. Refer to Standard
Procedures for the proper battery charging proce-
dures.
RSBATTERY SYSTEM8F-9
BATTERY (Continued)

SPIRAL-PLATE BATTERY CHARGE RATE TABLE
Voltage Minutes
14.4 volts maximum up to 10 minutes
13.0 to 14 volts up to 20 minutes
12.9 volts or less up to 30 minutes
CHARGING TIME REQUIRED
The time required to charge a battery will vary,
depending upon the following factors:
²Battery Capacity- A completely discharged
heavy-duty battery requires twice the charging time
of a small capacity battery.
²Temperature- A longer time will be needed to
charge a battery at -18É C (0É F) than at 27É C
(80É F). When a fast battery charger is connected to a
cold battery, the current accepted by the battery will
be very low at first. As the battery warms, it will
accept a higher charging current rate (amperage).
²Charger Capacity- A battery charger that
supplies only five amperes will require a longer
charging time. A battery charger that supplies eight
amperes will require a shorter charging time.
²State-Of-Charge- A completely discharged bat-
tery requires more charging time than a partially
discharged battery. Electrolyte is nearly pure water
in a completely discharged battery. At first, the
charging current (amperage) will be low. As the bat-
tery charges, the specific gravity of the electrolyte
will gradually rise.
The Battery Charging Time Table gives an indica-
tion of the time required to charge a typical battery
at room temperature based upon the battery state-of-
charge and the charger capacity.
SPIRAL-PLATE BATTERY CHARGING TIME
TABLE
Charging
Amperage5 Amps 8 Amps
Open Circuit
VoltageHours Charging @ 21É C
(70É F)
12.25 to 12.49 6 hours 3 hours
12.00 to 12.24 10 hours 5 hours
10.00 to 11.99 14 hours 7 hours
Below 10.00 18 hours 9 hours
STANDARD PROCEDURE - CONVENTIONAL
BATTERY CHARGING
Vehicles equipped with a diesel engine utilize a
unique spiral plate battery. This battery has a maxi-
mum charging voltage that must be used in order to
restore the battery to its full potential, failure to usethe spiral plate battery charging procedure could
result in damage to the battery or personal injury.
Battery charging is the means by which the bat-
tery can be restored to its full voltage potential. A
battery is fully-charged when:
²Micro 420 battery tester indicates battery is OK.
²Open-circuit voltage of the battery is 12.65 volts
or above.
²Battery passes Load Test multiple times.
WARNING: IF THE BATTERY SHOWS SIGNS OF
FREEZING, LEAKING, LOOSE POSTS, DO NOT
TEST, ASSIST-BOOST, OR CHARGE. THE BATTERY
MAY ARC INTERNALLY AND EXPLODE. PERSONAL
INJURY AND/OR VEHICLE DAMAGE MAY RESULT.
WARNING: EXPLOSIVE HYDROGEN GAS FORMS IN
AND AROUND THE BATTERY. DO NOT SMOKE,
USE FLAME, OR CREATE SPARKS NEAR THE BAT-
TERY. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT.
WARNING: THE BATTERY CONTAINS SULFURIC
ACID, WHICH IS POISONOUS AND CAUSTIC. AVOID
CONTACT WITH THE SKIN, EYES, OR CLOTHING.
IN THE EVENT OF CONTACT, FLUSH WITH WATER
AND CALL A PHYSICIAN IMMEDIATELY. KEEP OUT
OF THE REACH OF CHILDREN.
WARNING: IF THE BATTERY IS EQUIPPED WITH
REMOVABLE CELL CAPS, BE CERTAIN THAT EACH
OF THE CELL CAPS IS IN PLACE AND TIGHT
BEFORE THE BATTERY IS RETURNED TO SER-
VICE. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT FROM LOOSE OR MISSING
CELL CAPS.
CAUTION: Always disconnect and isolate the bat-
tery negative cable before charging a battery. Do
not exceed sixteen volts while charging a battery.
Damage to the vehicle electrical system compo-
nents may result.
CAUTION: Battery electrolyte will bubble inside the
battery case during normal battery charging. Elec-
trolyte boiling or being discharged from the battery
vents indicates a battery overcharging condition.
Immediately reduce the charging rate or turn off the
charger to evaluate the battery condition. Damage
to the battery may result from overcharging.
RSBATTERY SYSTEM8F-11
BATTERY (Continued)

found on the original equipment battery label. Be
certain that a replacement battery has the correct
Group Size number, as well as CCA, and RC or AH
ratings that equal or exceed the original equipment
specification for the vehicle being serviced. Refer to
Battery Specificationsin this group for the loca-
tion of the proper factory-installed battery specifica-
tions.
OPERATION
The battery is designed to store electrical energy in
a chemical form. When an electrical load is applied to
the terminals of the battery, an electrochemical reac-
tion occurs. This reaction causes the battery to dis-
charge electrical current from its terminals. As the
battery discharges, a gradual chemical change takes
place within each cell. The sulfuric acid in the elec-
trolyte combines with the plate materials, causing
both plates to slowly change to lead sulfate. At the
same time, oxygen from the positive plate material
combines with hydrogen from the sulfuric acid, caus-
ing the electrolyte to become mainly water. The
chemical changes within the battery are caused by
the movement of excess or free electrons between the
positive and negative plate groups. This movement of
electrons produces a flow of electrical current
through the load device attached to the battery ter-
minals. As the plate materials become more similar chem-
ically, and the electrolyte becomes less acid, the volt-
age potential of each cell is reduced. However, by
charging the battery with a voltage higher than that
of the battery itself, the battery discharging process
is reversed. Charging the battery gradually changes
the sulfated lead plates back into sponge lead and
lead dioxide, and the water back into sulfuric acid.
This action restores the difference in the electron
charges deposited on the plates, and the voltage
potential of the battery cells. For a battery to remain
useful, it must be able to produce high-amperage cur-
rent over an extended period. A battery must also be
able to accept a charge, so that its voltage potential
may be restored. The battery is vented to release excess hydrogen
gas that is created when the battery is being charged
or discharged. However, even with these vents,
hydrogen gas can collect in or around the battery. If
hydrogen gas is exposed to flame or sparks, it may
ignite. If the electrolyte level is low, the battery may
arc internally and explode. If the battery is equipped
with removable cell caps, add distilled water when-
ever the electrolyte level is below the top of the
plates. If the battery cell caps cannot be removed, the
battery must be replaced if the electrolyte level
becomes low.
DIAGNOSIS AND TESTING - BATTERY
The battery must be completely charged and the
terminals should be properly cleaned and inspected
before diagnostic procedures are performed. Refer to
Battery System Cleaning for the proper cleaning pro-
cedures, and Battery System Inspection for the
proper battery inspection procedures. Refer to Stan-
dard Procedures for the proper battery charging pro-
cedures.
MICRO 420 BATTERY TESTER
The Micro 420 automotive battery tester is
designed to help the dealership technicians diagnose
the cause of a defective battery. Follow the instruc-
tion manual supplied with the tester to properly
diagnose a vehicle. If the instruction manual is not
available refer to the standard procedure in this sec-
tion, which includes the directions for using the
Micro 420 battery tester.
WARNING: IF THE BATTERY SHOWS SIGNS OF
FREEZING, LEAKING OR LOOSE POSTS, DO NOT
TEST, ASSIST-BOOST, OR CHARGE. THE BATTERY
MAY ARC INTERNALLY AND EXPLODE. PERSONAL
INJURY AND/OR VEHICLE DAMAGE MAY RESULT.
WARNING: EXPLOSIVE HYDROGEN GAS FORMS IN
AND AROUND THE BATTERY. DO NOT SMOKE,
USE FLAME, OR CREATE SPARKS NEAR THE BAT-
TERY. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT.
WARNING: THE BATTERY CONTAINS SULFURIC
ACID, WHICH IS POISONOUS AND CAUSTIC. AVOID
CONTACT WITH THE SKIN, EYES, OR CLOTHING.
IN THE EVENT OF CONTACT, FLUSH WITH WATER
AND CALL A PHYSICIAN IMMEDIATELY. KEEP OUT
OF THE REACH OF CHILDREN.
A battery that will not accept a charge is faulty,
and must be replaced. Further testing is not
required. A fully-charged battery must be tested to
determine its cranking capacity. A battery that is ful-
ly-charged, but does not pass the Micro 420 or load
test, is faulty and must be replaced.
NOTE: Completely discharged batteries may take
several hours to accept a charge. Refer to Standard
Procedures for the proper battery charging proce-
dures.
RS BATTERY SYSTEM8Fs-9
BATTERY (Continued)

SPIRAL-PLATE BATTERY CHARGE RATE TABLEVoltage Minutes
14.4 volts maximum up to 10 minutes 13.0 to 14 volts up to 20 minutes
12.9 volts or less up to 30 minutes
CHARGING TIME REQUIRED
The time required to charge a battery will vary,
depending upon the following factors: ² Battery Capacity - A completely discharged
heavy-duty battery requires twice the charging time
of a small capacity battery. ² Temperature - A longer time will be needed to
charge a battery at -18É C (0É F) than at 27É C (80É
F). When a fast battery charger is connected to a cold
battery, the current accepted by the battery will be
very low at first. As the battery warms, it will accept
a higher charging current rate (amperage). ² Charger Capacity - A battery charger that
supplies only five amperes will require a longer
charging time. A battery charger that supplies eight
amperes will require a shorter charging time. ² State-Of-Charge - A completely discharged bat-
tery requires more charging time than a partially
discharged battery. Electrolyte is nearly pure water
in a completely discharged battery. At first, the
charging current (amperage) will be low. As the bat-
tery charges, the specific gravity of the electrolyte
will gradually rise. The Battery Charging Time Table gives an indica-
tion of the time required to charge a typical battery
at room temperature based upon the battery state-of-
charge and the charger capacity.
SPIRAL-PLATE BATTERY CHARGING TIME TABLE
Charging
Amperage 5 Amps 8 Amps
Open Circuit Voltage Hours Charging @ 21É
C (70É F)
12.25 to 12.49 6 hours 3 hours
12.00 to 12.24 10 hours 5 hours 10.00 to 11.99 14 hours 7 hours Below 10.00 18 hours 9 hours
STANDARD PROCEDURE - CONVENTIONAL
BATTERY CHARGING
Vehicles equipped with a diesel engine utilize a
unique spiral plate battery. This battery has a maxi-
mum charging voltage that must be used in order to
restore the battery to its full potential, failure to use the spiral plate battery charging procedure could
result in damage to the battery or personal injury.
Battery charging is the means by which the bat-
tery can be restored to its full voltage potential. A
battery is fully-charged when: ² Micro 420 battery tester indicates battery is OK.
² Open-circuit voltage of the battery is 12.65 volts
or above. ² Battery passes Load Test multiple times.
WARNING: IF THE BATTERY SHOWS SIGNS OF
FREEZING, LEAKING, LOOSE POSTS, DO NOT
TEST, ASSIST-BOOST, OR CHARGE. THE BATTERY
MAY ARC INTERNALLY AND EXPLODE. PERSONAL
INJURY AND/OR VEHICLE DAMAGE MAY RESULT.
WARNING: EXPLOSIVE HYDROGEN GAS FORMS IN
AND AROUND THE BATTERY. DO NOT SMOKE,
USE FLAME, OR CREATE SPARKS NEAR THE BAT-
TERY. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT.
WARNING: THE BATTERY CONTAINS SULFURIC
ACID, WHICH IS POISONOUS AND CAUSTIC. AVOID
CONTACT WITH THE SKIN, EYES, OR CLOTHING.
IN THE EVENT OF CONTACT, FLUSH WITH WATER
AND CALL A PHYSICIAN IMMEDIATELY. KEEP OUT
OF THE REACH OF CHILDREN.
WARNING: IF THE BATTERY IS EQUIPPED WITH
REMOVABLE CELL CAPS, BE CERTAIN THAT EACH
OF THE CELL CAPS IS IN PLACE AND TIGHT
BEFORE THE BATTERY IS RETURNED TO SER-
VICE. PERSONAL INJURY AND/OR VEHICLE DAM-
AGE MAY RESULT FROM LOOSE OR MISSING
CELL CAPS.
CAUTION: Always disconnect and isolate the bat-
tery negative cable before charging a battery. Do
not exceed sixteen volts while charging a battery.
Damage to the vehicle electrical system compo-
nents may result.
CAUTION: Battery electrolyte will bubble inside the
battery case during normal battery charging. Elec-
trolyte boiling or being discharged from the battery
vents indicates a battery overcharging condition.
Immediately reduce the charging rate or turn off the
charger to evaluate the battery condition. Damage
to the battery may result from overcharging.
RS BATTERY SYSTEM8Fs-11
BATTERY (Continued)

8W-15 GROUND DISTRIBUTION
Component Page
A/C Compressor Clutch......................8W-15-2, 9
A/C-Heater Control......................8W-15-10, 12
Adjustable Pedals Module.....................8W-15-18
Adjustable Pedals Switch.....................8W-15-11
Airbag Control Module.......................8W-15-13
Auto Temp Control.........................8W-15-10
Automatic Day/Night Mirror...................8W-15-22
Back-Up Lamp Switch......................8W-15-2, 4
Battery.............................8W-15-2, 3, 4
Body Control Module.......................8W-15-23
Brake Fluid Level Switch.....................8W-15-18
Brake Lamp Switch........................8W-15-18
Cabin Heater Assist.........................8W-15-9
Cd Changer.............................8W-15-13
Center High Mounted Stop Lamp.................8W-15-28
Clutch Pedal Interlock Switch...................8W-15-18
Clutch Pedal Upstop Switch....................8W-15-19
Controller Antilock Brake....................8W-15-2, 4
Crank Case Ventilation Heater...................8W-15-9
Crankshaft Position Sensor.....................8W-15-4
Data Link Connector.....................8W-15-3, 4, 18
Dosing Pump............................8W-15-9
Driver Door Courtesy Lamp..................8W-15-15, 21
Driver Door Lock Switch....................8W-15-15, 21
Driver Heated Seat Cushion....................8W-15-17
Driver Heated Seat Module....................8W-15-17
Driver Power Seat Switch.....................8W-15-17
Driver Power Window Switch.................8W-15-15, 21
Dvd/Cd Changer..........................8W-15-11
EGR Solenoid............................8W-15-3
Engine Control Module.......................8W-15-4
Floor Console Lamp........................8W-15-26
Floor Console Power Outlet....................8W-15-26
Front Blower Module.......................8W-15-12
Front Cigar Lighter........................8W-15-10
Front Control Module...................8W-15-2, 8, 9, 19
Front Reading Lamps/Switch...................8W-15-22
Fuel Heater............................8W-15-26
Fuel Heater Relay..........................8W-15-4
Fuel Pump Module.........................8W-15-26
G100...............................8W-15-2, 4
G101...............................8W-15-2, 4
G102..............................8W-15-5, 6, 7
G103.................................8W-15-9
G200............................8W-15-10, 11, 12
G201................................8W-15-13
G202................................8W-15-13
G300......................8W-15-12, 14, 16, 17, 18, 19
G301..........................8W-15-20, 21, 22, 23
G302............................8W-15-24, 25, 26
G303............................8W-15-26, 27, 28
Generator..............................8W-15-2
Headlamp Switch.........................8W-15-10
Headlamp Washer Pump Motor..................8W-15-7
High Note Horn...........................8W-15-6
Hood Ajar Switch.........................8W-15-19
Horn Switch............................8W-15-12
Instrument Cluster........................8W-15-10
Instrument Panel Switch Bank..................8W-15-11
Integrated Power Module..............8W-15-2, 3, 4, 8, 9, 19
Left B-Pillar Switch........................8W-15-18
Left Cinch/Release Motor.....................8W-15-14
Left Cylinder Lock Switch...................8W-15-15, 16
Left Door Speaker.........................8W-15-13
Left Fog Lamp............................8W-15-6
Left Front Door Ajar Switch....................8W-15-16
Left Front Door Lock Motor/Ajar Switch...........8W-15-15, 16
Left Front Park/Turn Signal Lamp.................8W-15-6
Left Full Open Switch.......................8W-15-14
Left Headlamp...........................8W-15-19
Left Headlamp Leveling Motor...................8W-15-7
Left High Beam Lamp.....................8W-15-8, 19
Left Liftgate Flood Lamp.....................8W-15-27
Left Low Beam Lamp......................8W-15-8, 19
Left Mid Reading Lamp......................8W-15-22
Left Park Lamp.........................8W-15-8, 19
Left Power Mirror.........................8W-15-11
Left Rear Lamp Assembly.....................8W-15-26
Left Rear Reading Lamp......................8W-15-22
Left Rear Speaker.........................8W-15-13
Left Sliding Door Control Module.................8W-15-14Component Page
Left Sliding Door Latch Sensing Switch.............8W-15-14
Left Sliding Door Lock Motor...................8W-15-14
Left Sliding Door Lock Motor/Ajar Switch............8W-15-14
Left Sliding Door Motor......................8W-15-14
Left Turn Signal Lamp......................8W-15-19
Left Visor/Vanity Lamp......................8W-15-22
License Lamp.........................8W-15-24, 27
Lift Pump Motor..........................8W-15-26
Liftgate Ajar Switch........................8W-15-28
Liftgate Cinch/Release Motor.................8W-15-24, 28
Liftgate Right Pinch Sensor....................8W-15-24
Low Note Horn...........................8W-15-6
Memory Seat/Mirror Module...................8W-15-17
Natural Vacuum Leak Detection Assembly...........8W-15-2, 3
Overhead Console.........................8W-15-22
Oxygen Sensor 1/1 Upstream....................8W-15-3
Oxygen Sensor 1/2 Downstream..................8W-15-3
Passenger Door Courtesy Lamp................8W-15-16, 21
Passenger Door Lock Switch.................8W-15-16, 21
Passenger Heated Seat Cushion..................8W-15-23
Passenger Heated Seat Module..................8W-15-23
Passenger Power Seat Switch...................8W-15-23
Power Folding Mirror Switch...................8W-15-12
Power Liftgate Module.......................8W-15-24
Power Liftgate Motor.......................8W-15-24
Power Mirror Switch........................8W-15-12
Power Outlet............................8W-15-10
Power Window Switch.......................8W-15-15
Powertrain Control Module.....................8W-15-3
Radiator Fan No. 1.........................8W-15-5
Radiator Fan No. 2.........................8W-15-5
Radiator Fan Relay.........................8W-15-5
Radiator Fan Relay No. 3......................8W-15-5
Radio................................8W-15-13
Rear Auto Temp Control Switch..................8W-15-18
Rear Blower Front Control Switch................8W-15-12
Rear Blower Motor Power Module................8W-15-26
Rear Blower Rear Control Switch.................8W-15-18
Rear Dome Lamp.........................8W-15-22
Rear Power Outlet.........................8W-15-26
Rear Window Defogger Grid....................8W-15-28
Rear Wiper Motor.........................8W-15-27
Right B-Pillar Switch.......................8W-15-23
Right Cinch/Release Motor....................8W-15-20
Right Cylinder Lock Switch....................8W-15-21
Right Door Speaker........................8W-15-13
Right Fog Lamp...........................8W-15-6
Right Front Door Ajar Switch...................8W-15-21
Right Front Door Lock Motor/Ajar Switch............8W-15-21
Right Front Park/Turn Signal Lamp................8W-15-6
Right Full Open Switch......................8W-15-20
Right Headlamp..........................8W-15-19
Right Headlamp Leveling Motor..................8W-15-7
Right High Beam Lamp.....................8W-15-8, 19
Right Liftgate Flood Lamp....................8W-15-27
Right Low Beam Lamp.....................8W-15-8, 19
Right Mid Reading Lamp.....................8W-15-22
Right Park Lamp........................8W-15-8, 19
Right Power Mirror........................8W-15-11
Right Rear Lamp Assembly..................8W-15-25, 26
Right Rear Reading Lamp.....................8W-15-22
Right Rear Speaker........................8W-15-13
Right Sliding Door Control Module................8W-15-20
Right Sliding Door Latch Sensing Switch.............8W-15-20
Right Sliding Door Lock Motor..................8W-15-20
Right Sliding Door Lock Motor/Ajar Switch...........8W-15-20
Right Sliding Door Motor.....................8W-15-20
Right Turn Signal Lamp......................8W-15-19
Right Visor/Vanity Lamp.....................8W-15-22
Sentry Key Remote Entry Module.................8W-15-11
Siren................................8W-15-11
Speed Control Servo.........................8W-15-2
Sunroof Module..........................8W-15-25
Sunroof Switch...........................8W-15-22
Thatcham Alarm Module.....................8W-15-11
Traction Control Switch......................8W-15-11
Trailer Tow Connector.......................8W-15-25
Transmission Control Relay.....................8W-15-3
Washer Fluid Level Switch.....................8W-15-5
Wiper Module...........................8W-15-18
RS8W-15 GROUND DISTRIBUTION8W-15-1