brake CHRYSLER CARAVAN 2005 Service Manual

(3) Gently push the plunger on the brake lamp
switch in until it stops.
(4) With the switch in this depressed position
(plunger pushed in), use an ohmmeter to test each of
the three internal switches as shown (Fig. 2). You
should achieve the results as listed in the figure.
If you do not achieve the results as listed in both
figures, the switch is faulty and must be replaced.
Refer to Removal And Installation in this section.
If the switch is found to be operating properly, it
may be misadjusted. Do not reinstall the switch,
replace it. (Refer to 8 - ELECTRICAL/LAMPS/
LIGHTING - EXTERIOR/BRAKE LAMP SWITCH -
INSTALLATION)
CAUTION: The switch can only be adjusted once.
That is during initial installation of the switch. If the
switch is not adjusted properly or has beenremoved for any reason, a new switch must be
installed and adjusted.
REMOVAL
(1) Disconnect and isolate the battery negative
cable from its post on the battery.
(2) Remove silencer panel below steering column
and knee blocker.
(3) Remove the brake lamp switch by rotating the
switch in a counterclockwise direction approximately
30 degrees and pulling it out of the bracket (Fig. 3).
(4) Release the locking tab and disconnect the wir-
ing connector from the switch.
(5) Discard the brake lamp switch. It must not be
reused.
INSTALLATION
CAUTION: Do not reuse the original brake lamp
switch. The switch can only be adjusted once. That
is during initial installation of the switch. If the
switch is not adjusted properly or has been
removed for some service, a new switch must be
installed and adjusted.
(1) Mount and adjust the NEW brake lamp switch
using the following procedure:
(a) Connect the wiring connector to the switch
and latch the locking tab.
Fig. 1 SWITCH TEST - RELEASED POSITION
Fig. 2 SWITCH TEST - DEPRESSED POSITION
Fig. 3 Brake Lamp Switch And Pedal With Bracket
1 - BRAKE LAMP SWITCH
2 - WIRING CONNECTOR
3 - PEDAL AND BRACKET
RSLAMPS/LIGHTING - EXTERIOR8L-5
BRAKE LAMP SWITCH (Continued)

(b) Install the switch in its bracket by aligning
the index tab on the switch with the slot in the
mounting bracket.
(c) When the switch is fully seated in its
bracket, rotate the switch clockwise approximately
30É to lock the switch into place.
(d) With the brake pedal in the fully released
position, move the lever on the back of the brake
lamp switch from the angled non-adjusted position
to the full vertical position as shown (Fig. 4). This
will adjust the brake lamp switch to the vehicle.
(2) Install silencer panel below steering column
knee blocker.
(3) Reconnect the battery negative terminal.
(4) Check the stop lamps to verify they are operat-
ing properly and not staying on when the pedal is in
the released position.
(5) Road test the vehicle to ensure proper opera-
tion of the brakes including ABS and speed control (if
equipped).
CENTER HIGH MOUNTED
STOP LAMP
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove two retaining screws (Fig. 5).
(3) Twist socket counter-clockwise and remove
from lamp.
(4) Pull bulb from socket (Fig. 7).
INSTALLATION
(1) Push bulb into socket.
(2) Install socket into the lamp unit.
(3) Install the retaining screws.
(4) Reconnect the battery negative cable.
CENTER HIGH MOUNTED
STOP LAMP UNIT
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the two retaining screws (Fig. 5).
(3) Disconnect the rear window washer nozzle
assembly (Fig. 6).
(4) Disconnect CHMSL electrical connector from
bulb socket (Fig. 7).
INSTALLATION
(1) Connect electrical connector to CHMSL bulb
socket.
(2) Reconnect the rear window washer nozzle
assembly.
Fig. 4 Adjustment Lever Movement
Fig. 5 CHMSL UNIT
1 - CHMSL UNIT
2 - LIFTGATE
Fig. 6 REAR WASHER NOZZLE ASSEMBLY
1 - BARREL IN CHMSL
2 - NOZZLE ASSEMBLY
3 - SQUEEZE ARMS TO RELEASE NOZZLE ASSEMBLY
4 - HOSE
8L - 6 LAMPS/LIGHTING - EXTERIORRS
BRAKE LAMP SWITCH (Continued)

LAMPS/LIGHTING - INTERIOR
TABLE OF CONTENTS
page page
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS
INTERIOR LAMPS.....................20
CENTER CONSOLE LAMP
REMOVAL.............................21
INSTALLATION.........................21
CENTER CONSOLE LAMP SWITCH
REMOVAL.............................21
INSTALLATION.........................21
CLUSTER ILLUMINATION LAMPS
REMOVAL.............................21
INSTALLATION.........................21
COURTESY LAMP
REMOVAL.............................21
INSTALLATION.........................21DOME/CARGO LAMP
REMOVAL.............................22
INSTALLATION.........................22
GLOVE BOX LAMP SWITCH
REMOVAL.............................22
INSTALLATION.........................22
LIFTGATE LAMP
REMOVAL.............................22
INSTALLATION.........................22
READING LAMP
REMOVAL.............................22
INSTALLATION.........................23
VANITY LAMP
REMOVAL.............................24
INSTALLATION.........................24
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS
INTERIOR LAMPS
BULB APPLICATION TABLE
LAMP BULB
ABS LED
AIRBAG LED
ALARM SET LED
BRAKE SYSTEM
WARNINGLED
CONSOLE 194
CRUISE INDICATOR VFD*
DOME/RAIL LAMPS 578
DOOR AJAR INDICATOR LED
DOOR COURTESY
LAMP578
FRONT DOOR
COURTESY567
GLOVE BOX 194
HIGH BEAM INDICATOR LED
CLUSTER
ILLUMINATIONPC74
LIFTGATE 578
LAMP BULB
LIFTGATE AJAR LED
LOW FUEL INDICATOR LED
LOW WASHER FLUID
INDICATORLED
MIL LED
OIL INDICATOR LED
OVERHEAD CONSOLE
READINGPC579
PRNDL INDICATOR
(BASE CLUSTER)LED
PRNDL INDICATOR VFD
READING 578
SEAT BELT INDICATOR LED
TEMPERATURE
INDICATORLED
TIRE PRESSURE
WARNINGLED
TRAC OFF INDICATOR VFD*
VISOR VANITY 6501966
VOLTAGE INDICATOR LED
* VFD = VACUUM FLUORESCENT DISPLAY
8L - 20 LAMPS/LIGHTING - INTERIORRS

AUTOMATIC DAY / NIGHT
MIRROR
DESCRIPTION
An automatic dimming inside day/night rear view
mirror and an automatic dimming driver side outside
rear view mirror are available factory-installed
options on this model. Following is a general descrip-
tion of this optional equipment.
The automatic day/night mirror is able to automat-
ically change its reflectance. A thin layer of electro-
chromic material between two pieces of conductive
glass make up the face of the mirror. Two photocell
sensors are used to monitor light levels and adjust
the reflectance of the mirror to reduce the glare of
headlamps approaching the vehicle from the rear.
For removal procedures, (Refer to 23 - BODY/IN-
TERIOR/REAR VIEW MIRROR - REMOVAL).
OPERATION
The ambient photocell sensor faces forward, to
detect the outside light levels. A second sensor faces
rearward to detect the light level received through
the vehicles back window. When the difference
between the two light levels becomes too great (the
light level received at the rear of the mirror is much
higher than that at the front of the mirror), the mir-
ror begins to darken.
The mirror switch allows the driver a manual con-
trol of whether the automatic dimming feature is
operational. When AUTO is selected a small Light-
Emitting Diode (LED), to the right of the mirror
switch, is illuminated. The automatic dimming fea-
ture will only operate when the ignition switch is in
the On position. The mirror also senses the backup
lamp circuit, and will automatically disable its self-
dimming feature whenever the transmission gear
selector is in the Reverse position.
NOTE: The mirror always defaults to an ON state
upon ignition.
The driver side automatic dimming mirror is stan-
dard with the automatic dimming inside mirror. The
signal to control the dimming of that mirror is gen-
erated by the automatic day/night inside rear view
mirror circuitry. That signal is then delivered to the
driver side outside rear view mirror on a hard wired
circuit.
The automatic day/night mirror cannot be
repaired. If faulty or damaged, the entire inside rear
view mirror assembly must be replaced.
DIAGNOSIS AND TESTING
AUTOMATIC DAY / NIGHT MIRROR
For circuit descriptions and diagrams, refer to the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.
(1) Check the fuse in the intelligent power module.
If OK, go to Step 2. If not OK, repair the shorted cir-
cuit or component as required and replace the faulty
fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the intelli-
gent power module. If OK, go to Step 3. If not OK,
repair the open circuit to the ignition switch as
required.
(3) Unplug the wire harness connector from the
automatic day/night mirror. Check for battery voltage
at the fused ignition switch output circuit cavity of
the automatic day/night mirror wire harness connec-
tor. If OK, go to Step 4. If not OK, repair the open
circuit to the junction block as required.
(4) Turn the ignition switch to the Off position.
Check for continuity between the ground circuit cav-
ity of the automatic day/night mirror wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 5. If not OK, repair the cir-
cuit to ground as required.
(5) Turn the ignition switch to the On position. Set
the parking brake. Place the transmission gear selec-
tor lever in the Reverse position. Check for battery
voltage at the backup lamp switch output circuit cav-
ity of the automatic day/night mirror wire harness
connector. If voltage is present, reinstall the auto-
matic day/night mirror wire harness connector and
go to Step 6. If not OK, repair the open circuit as
required.
(6) Place the transmission gear selector lever in
the Neutral position. Place the automatic day/night
mirror switch in the On (LED in the switch is
lighted) position. Cover the forward facing ambient
photocell sensor to keep out any ambient light.
NOTE: The ambient photocell sensor must be cov-
ered completely, so that no light reaches the sen-
sor. Use a finger pressed tightly against the sensor,
or cover the sensor completely with electrical tape.
(7) Shine a light into the rearward facing head-
lamp photocell sensor. The automatic day/night mir-
ror should darken. The automatic day/night mirror
should darken within 2 minutes if testing for the
first time. For immediate response, turn the vehicle
8N - 28 POWER MIRRORSRS

WARNING: Wait two minutes for the airbag system
reserve capacitor to discharge before beginning
any airbag system or component service. Failure to
do so may result in accidental airbag deployment,
personal injury or death.
(4) Clean powder residue from interior of vehicle
(Refer to 8 - ELECTRICAL/RESTRAINTS - STAN-
DARD PROCEDURE - SERVICE AFTER AN AIR-
BAG DEPLOYMENT).
(5) Remove instrument panel (Refer to 23 - BODY/
INSTRUMENT PANEL/INSTRUMENT PANEL
ASSEMBLY - REMOVAL).
(6) Remove all reusable components from the
upper instrument panel and transfer to the new
instrument panel.
UNDEPLOYED AIRBAG
(1) Open hood.
(2) Disconnect and isolate the battery negative
cable.
(3)
WARNING: Wait two minutes for the airbag system
reserve capacitor to discharge before beginning
any airbag system or component service. Failure to
do so may result in accidental airbag deployment,
personal injury or death.
(4) Remove center console bin between front seats.
(5) Remove left front door sill plate using a trim
stick (special tool #C-4755) or equivalent, and gently
prying up on sill plate.
(6) Remove left cowl panel using a trim stick or
equivalent, and gently prying out on cowl panel.
(7) Remove four screws to lower steering column
cover and remove cover.
(8) Unsnap parking brake lever from knee blocker
reinforcement.
(9) Remove Data Link Connector (DLC) from knee
blocker.
(10) Remove screws to knee blocker.
(11) Unsnap left A-pillar lower extension trim
using a trim stick or equivalent.
(12) Remove three left side instrument panel A-pil-
lar retaining bolts and loosen the instrument panel
roll down bolt.
(13) Remove four nuts at brake pedal support
bracket to instrument panel.
(14) Using a trim stick or equivalent, gently pry
off left side upper A-pillar trim.
(15) Remove six screws and two wiring connectors
to lower instrument panel cubby bin at bottom of
center stack.
(16) Remove two left side nuts at instrument panel
center stack support to floor.(17) Remove two right side nuts at instrument
panel center stack support to floor.
(18) Remove right front door sill plate using a trim
stick or equivalent, and gently prying up on sill
plate.
(19) Remove right cowl panel using a trim stick or
equivalent, and gently prying out on cowl panel.
(20) Using a trim stick or equivalent, gently pry
out on right instrument panel end cap.
(21) Unsnap right A-pillar lower extension trim
using a trim stick or equivalent.
(22) Remove three right side instrument panel
A-pillar retaining bolts and loosen the instrument
panel roll down bolt.
(23) Using a trim stick or equivalent, gently pry
off right side upper A-pillar trim.
(24) Open glove box, pinch in sides and roll down
towards floor. With a firm pull, snap glove box door
off hinges and remove.
(25) Using a trim stick or equivalent, gently pry
up on rear of instrument panel top cover and then
pull rearward and out.
(26) Using a trim stick or equivalent, gently pry
off the filler bezel just above the cup holder to expose
the lower screws to center bezel.
(27) Remove two screws and then using a trim
stick or equivalent, gently pry off instrument panel
center bezel.
(28) Remove center bezel wiring connectors to
HVAC control and switch assembly (hazard, rear
wiper/washer, heated seats) and remove bezel.
(29) Slide cup holder assembly from instrument
panel.
(30) Remove nineteen screws to right lower instru-
ment panel trim (glove box surround), unplug glove
box lamp wire connector, and remove panel.
(31) Remove four screws and wiring connectors to
radio and remove radio.
(32) Remove one far left instrument panel speaker
retaining screw.
(33) Remove four screws along top front edge of
instrument panel cover/pad.
(34) Remove seven lower instrument panel cover/
pad retaining screws starting from right of vehicle
and only removing these seven, not all of them.
(35) Remove six upper fence line instrument panel
retaining bolts.
(36) Roll back instrument panel just enough to
increase access to the passenger airbag retaining
bolts at the reinforcement. Lift the instrument panel
up slightly so as not to damage the air distribution to
HVAC unit seal.
(37) Disconnect the passenger airbag electrical
connector. Using a trim stick or equivalent, gently
pry electrical connector off of instrument panel rein-
forcement.
RSRESTRAINTS8O-31
PASSENGER AIRBAG (Continued)

(28) Install two right side nuts at instrument
panel center stack support to floor.
(29) Install two left side nuts at instrument panel
center stack support to floor.
(30) Connect the two wiring connectors to lower
instrument panel cubby bin at bottom of center stack
and install six screws.
(31) Align left side upper A-pillar trim over retain-
ing slots and firmly snap into place.
(32) Install four nuts at brake pedal support
bracket to instrument panel.
(33) Align left A-pillar lower extension trim over
retaining slots and firmly snap into place.
(34) Install knee blocker and retaining screws.
(35) Install Data Link Connector (DLC) into bot-
tom of knee blocker.
(36) Align parking brake lever and snap into place
on knee blocker reinforcement.
(37) Install lower steering column cover and four
retaining screws
(38) Align left cowl panel over retaining slots and
firmly snap into place.
(39) Align left front door sill plate over retaining
slots and firmly snap into place.
(40) Install center console bin between front seats.
WARNING: Do not connect the battery negative
cable (Refer to 8 - ELECTRICAL/RESTRAINTS -
DIAGNOSIS AND TESTING - AIRBAG SYSTEM). Per-
sonal injury or death may result if the system test
is not performed first.
(41) Close hood.
(42) Verify system and vehicle operation.
PASSENGER AIRBAG
DISABLED INDICATOR
DESCRIPTION
Vehicles equipped with the Occupant Classification
System (OCS) include a Passenger Airbag Disabled
(PAD) indicator (Fig. 40) which is located in the
instrument panel center stack, above the radio. The
PAD indicator is present only in vehicles equipped
with the OCS.The PAD indicator consists of a molded plastic
housing with an integral connector at the back. An
amber Light Emitting Diode (LED) behind the lens
causes the ªPASS AIR BAG OFFº text and icon to
appear silhouetted against an amber field through
the translucent lens when the indicator is illumi-
nated from behind by the LED. The PAD indicator is
available for separate service replacement.
OPERATION
In vehicles equipped with the Occupant Classifica-
tion System (OCS), the Passenger Airbag Disabled
(PAD) indicator gives an indication when the passen-
ger airbag and seat belt tensioner deployment cir-
cuits are disabled by the Occupant Restraint
Controller (ORC). The PAD indicator is controlled by
a transistor within the ORC through a hard wired
output based upon ORC programming and electronic
occupant classification messages received by the ORC
over the Programmable Communications Interface
(PCI) data bus from the Occupant Classification
Module (OCM). The PAD indicator Light Emitting
Diode (LED) is completely controlled by the ORC.
The LED receives a battery current input on the
fused ignition switch output (RUN/START) circuit.
Therefore, the LED will always be OFF when the
ignition switch is in any position except ON or
START. The LED only illuminates when it is pro-
vided a path to ground by the ORC transistor. The
ORC will turn on the PAD indicator for the following
reasons:
²Bulb Test- Each time the ignition switch is
turned to the ON position the PAD indicator is illu-
minated for about six seconds.
²Child Seat Detected Occupant Classifica-
tion Message- Each time the ORC receives a mes-
sage from the OCM indicating a child seat has been
detected in the passenger front seat, the passenger
airbag and seat belt tensioner deployment circuits
are deactivated and the PAD indicator will be illumi-
nated. The indicator remains illuminated until the
ORC receives an occupant classification message
indicating that:
²The passenger front seat is empty.
²The seat is occupied by a load equal to or
greater than a fifth percentile female.
²OR,Until the ignition switch is turned to the
OFF position, whichever of these three occurs first.
²Load Less Than Fifth Percentile Female
Occupant Classification Message- Each time the
ORC receives a message from the OCM indicating
that a load less than a fifth percentile female has
been detected in the passenger front seat, the pas-
senger airbag and seat belt tensioner deployment cir-
cuits are deactivated and the PAD indicator will be
illuminated. The indicator remains illuminated until:
Fig. 40 PASSENGER AIRBAG DISABLED (PAD)
INDICATOR
RSRESTRAINTS8O-33
PASSENGER AIRBAG (Continued)

SPEED CONTROL
TABLE OF CONTENTS
page page
SPEED CONTROL
DESCRIPTION..........................1
OPERATION
OPERATION..........................1
OPERATION - INTERACTIVE SPEED
CONTROL (4 Speed EATX Only)...........2
DIAGNOSIS AND TESTING - ROAD TEST.....3
SPECIFICATIONS - TORQUE...............3
CABLE
DESCRIPTION..........................4
OPERATION............................4
REMOVAL.............................4
INSTALLATION..........................4
SERVO
DESCRIPTION..........................4OPERATION............................4
REMOVAL.............................4
INSTALLATION..........................4
SWITCH
DESCRIPTION..........................5
OPERATION............................5
REMOVAL.............................5
INSTALLATION..........................6
VACUUM RESERVOIR
DESCRIPTION..........................6
OPERATION............................6
REMOVAL.............................6
INSTALLATION..........................6
SPEED CONTROL
DESCRIPTION
The speed control system is electronically con-
trolled and vacuum operated. The electronic control
is integrated into the Powertrain Control Module.
The controls are located on the steering wheel. The
ON/OFF, and SET buttons are located on the left side
of the airbag module. The RESUME/ACCEL, CAN-
CEL and COAST buttons are located on the right
side of the airbag module (Fig. 1).The system is designed to operate at speeds above
30 mph (48 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT
RECOMMENDED WHEN DRIVING CONDITIONS DO
NOT PERMIT MAINTAINING A CONSTANT SPEED,
SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT
ARE WINDING, ICY, SNOW COVERED, OR SLIP-
PERY.
OPERATION
OPERATION
When speed control is activated by depressing the
ON switch, the PCM allows a set speed to be stored
in RAM for speed control. To store a set speed,
depress and release the SET switch while the vehicle
is moving at a speed between 25 and 85 mph. In
order for the speed control to engage, the brakes can-
not be applied, nor can the gear selector be indicat-
ing the transmission is in Park or Neutral (ATX) or
1st/2nd gear (MTX). The speed control can be disen-
gaged manually by:
²Stepping on the brake pedal
²Depressing the OFF switch
²Depressing the CANCEL switch.
²Depressing the clutch pedal
²Operating in 1st or 2nd gear (autostick, if
equipped)
Fig. 1 SPEED CONTROL SWITCHES - Typical
RSSPEED CONTROL8P-1

OPERATION
The PCM on NGC vehicles first senses that the
speed control is set. If the set speed is exceeded by
more than 4 mph (6.5 km/hr) and the throttle is
closed, the PCM on NGC vehicles causes the trans-
axle to downshift to THIRD gear. After downshifting,
the automatic speed control resumes normal opera-
tion. To ensure that an upshift is appropriate after
the set speed is reached, the PCM on NGC vehicles
waits until the speed control system opens the throt-
tle at least 6 degrees before upshifting to OVER-
DRIVE again.
If the driver applies the brakes, canceling auto-
matic speed control operation with the transaxle still
in THIRD gear, the PCM on NGC vehicles maintains
this gear until the driver opens the throttle at least 6
degrees to avoid an inappropriate upshift. The
upshift is also delayed for 2.5 seconds after reaching
the 6 degrees throttle opening in anticipation that
the driver might open the throttle enough to require
THIRD gear. This will avoid unnecessary and dis-
turbing transmission cycling. If the automatic speed
control RESUME feature is used after braking, the
upshift is delayed until the set speed is achieved to
reduce cycling and provide better response.
DIAGNOSIS AND TESTING - ROAD TEST
Perform a vehicle road test to verify reports of
speed control system malfunction. The road test
should include attention to the speedometer. Speed-
ometer operation should be smooth and without flut-
ter at all speeds.Flutter in the speedometer indicates a problem
which might cause surging in the speed control sys-
tem. The cause of any speedometer problems should
be corrected before proceeding. Refer to the Instru-
ment Cluster for speedometer diagnosis.
If a road test verifies an inoperative system, and
the speedometer operates properly, check for:
²A Diagnostic Trouble Code (DTC). If a DTC
exists, conduct tests per the Powertrain Diagnostic
Procedures manual.
²A misadjusted brake (stop) lamp switch. This
could also cause an intermittent problem.
²Loose or corroded electrical connections at the
servo. Corrosion should be removed from electrical
terminals and a light coating of Mopar Multipurpose
Grease, or equivalent, applied.
²Leaking vacuum reservoir.
²Loose or leaking vacuum hoses or connections.
²Defective one-way vacuum check valve.
²Secure attachment at both ends of the speed
control servo cable.
²Smooth operation of throttle linkage and throttle
body air valve.
²Conduct electrical test at PCM.
²Failed speed control servo. Do the servo vacuum
test.
CAUTION: When test probing for voltage or conti-
nuity at electrical connectors, care must be taken
not to damage connector, terminals or seals. If
these components are damaged, intermittent or
complete system failure may occur.
SPECIFICATIONS - TORQUE
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Servo Mounting Bracket
Nuts14 10.3 123.9
Servo Mounting Bracket
Bolts14 10.3 123.9
Servo Mounting Nuts 6.7 60
RSSPEED CONTROL8P-3
SPEED CONTROL (Continued)

CABLE
DESCRIPTION
The speed control servo cable is connected between
the speed control vacuum servo diaphragm and the
throttle body control linkage.
OPERATION
This cable causes the throttle control linkage to
open or close the throttle valve in response to move-
ment of the vacuum servo diaphragm.
REMOVAL
(1) Disconnect the negative battery cable.
(2) Remove speed control cable from throttle cam
by sliding clasp out hole used for throttle cable.
(3) Compress the retaining tabs on the cable and
slide cable out of bracket.
(4) Disconnect electrical connectors and vacuum
hose from servo.
(5) Remove two nuts attaching speed control cable
and mounting bracket to servo.
(6) Pull cable away from servo to expose retaining
clip and remove clip attaching cable to servo.
(7) Remove speed control cable.
INSTALLATION
(1) Slide cable into throttle cable bracket and
engage retaining tabs.
(2) Rotate the throttle cam forward to the wide
open position and install speed control cable clasp.
(3) Rotate the throttle cam forward to the wide
open position and install throttle cable clasp.
(4) Install retaining clip that attaches cable to
servo.
(5) Insert servo studs through holes in the mount-
ing bracket and speed control cable.
(6) Install nuts, tighten to 6.7 N´m (60 in. lbs.).
(7) Connect vacuum hose to servo.
(8) Connect electrical connector.
(9) Install servo and bracket and tighten nuts and
bolt.
(10) Connect negative battery cable.
SERVO
DESCRIPTION
The servo unit consists of a solenoid valve body,
and a vacuum chamber. The solenoid valve body con-
tains three solenoids:
²Vacuum
²Vent
²Dump
The vacuum chamber contains a diaphragm with a
cable attached to control the throttle linkage.
OPERATION
The PCM controls the solenoid valve body. The
solenoid valve body controls the application and
release of vacuum to the diaphragm of the vacuum
servo. The servo unit cannot be repaired and is ser-
viced only as a complete assembly.
Power is supplied to the servo by the PCM through
the brake switch. The PCM controls the ground path
for the vacuum and vent solenoids.
The dump solenoid is energized anytime it receives
power. If power to the dump solenoid is interrupted,
the solenoid dumps vacuum in the servo. This pro-
vides a safety backup to the vent and vacuum sole-
noids.
The vacuum and vent solenoids must be grounded
by the PCM to operate. When the PCM grounds the
vacuum servo solenoid, the solenoid allows vacuum
to enter the servo and pull open the throttle plate
using the cable. When the PCM breaks the ground,
the solenoid closes and no more vacuum is allowed to
enter the servo. The PCM also operates the vent sole-
noid via ground. The vent solenoid opens and closes a
passage to bleed or hold vacuum in the servo as
required.
The PCM cycles the vacuum and vent solenoids to
maintain the set speed, or to accelerate and deceler-
ate the vehicle. To increase throttle opening, the
PCM grounds the vacuum and vent solenoids. To
decrease throttle opening, the PCM removes the
grounds from the vacuum and vent solenoids.
REMOVAL
(1) Release hood latch and open hood.
(2) Disconnect the negative battery cable.
(3) Disconnect the throttle and speed control cable
ends from throttle body (Fig. 2).
(4) Depress lock tabs holding speed control and
throttle cable casing to cable mount bracket.
(5) Disconnect vacuum line from speed control
servo that leads to the battery tray/vacuum reservoir.
(6) Remove battery tray/vacuum reservoir, refer to
the Battery section for more information (Fig. 3).
(7) Remove speed control servo and bracket (Fig.
4).
(8) Disconnect wire connector from speed control
servo.
(9) Remove speed control servo.
INSTALLATION
Transfer speed control cable to replacement speed
control servo.
(1) Install retaining clip to cable at servo.
(2) Install 2 nuts at cable to servo and servo
bracket, tighten to 7 N´m (60 ins. lbs.).
(3) Connect electrical connector to servo.
8P - 4 SPEED CONTROLRS

(4) Connect vacuum line to speed control servo
that leads to the battery tray/vacuum reservoir.
(5) Install speed control servo and bracket.
(6) Install battery tray/vacuum reservoir, refer to
the Battery section for more information.
(7) Install speed control and throttle cable casing
to cable mount bracket.
(8) Connect the throttle and speed control cable
ends to throttle body.
(9) Connect the negative battery cable.
SWITCH
DESCRIPTION
There are two separate switch pods that operate
the speed control system and are located on the
steering wheel.
OPERATION
The speed control system has five separate resis-
tive switches that provide a single multiplexed
(MUX) voltage inputs to the PCM.The switch names
are: ON, OFF, SET, COAST, RESUME, ACCEL, TAP-
UP, COAST, and CANCEL. Based on conditions when
the buttons are pushed (and released), the five volt-
age ranges provided to the PCM result in the follow-
ing functions: ON, OFF, SET, COAST, RESUME,
ACCEL, TAP-UP, TAP-DOWN, COAST, and CAN-
CEL. Refer to the Speed Control Section for more
information
Also the PCM receives an input from the brake
switch to sense whether the brake pedal has been
depressed. When the PCM receives the brake
depressed input, it turns off power to the speed con-
trol servo and disengages speed control. Also the
power to the servo is supplied through the brake
switch, which opens the circuit when the brake pedal
is depressed.
The individual switches cannot be repaired. If one
switch fails, the entire switch module must be
replaced.
REMOVAL
The speed control switches are mounted in the
steering wheel and wired through the clock spring
device under the airbag module.
Fig. 2 Speed Control Cable End
1 - SPEED CONTROL VACUUM HOSE
2 - THROTTLE BODY
3 - SPEED CONTROL CABLE
Fig. 3 BATTERY TRAY/VACUUM RESERVOIR
Fig. 4 SPEED CONTROL SERVO
RSSPEED CONTROL8P-5
SERVO (Continued)