brake sensor CHRYSLER VOYAGER 2001 Service Manual

3.7.6 EXTERIOR LIGHTING BATTERY
SAVER
The BCM monitors the status of, and controls, the
Park Lamps, Headlamps and Fog Lamp relays. If
any exterior lamps are left ON after the ignition is
turned OFF, the BCM will turn them OFF after 3
minutes.
3.7.7 AUTO HEADLAMPS
This feature is available on vehicles equipped
with both the Electrocromatic Mirror (ECM) and
the Compass/Mini-Trip Computer (CMTC). When
the BCM detects a day/night signal from the CMTC,
an ECM is present and Auto Headlamp mode is
selected.
3.8 FRONT CONTROL MODULE
The Front Control Module (FCM) is an electrical
control and interface center located in the engine
compartment. When it is mated to the Power Dis-
tribution Center (PDC), it is referred to as the
Intelligent Power Module (IPM). The IPM, with its
fuses and relays provides power and signal distri-
bution throughout most of the vehicle. The FCM
receives both hard wire and digital electronic inputs
from the vehicle electrical system through the PDC.
Based on these inputs and the ignition switch
position, it provides direct power feeds and relay
control to some of the vehicles' most critical electri-
cal systems.
The Front Control Module provides the following
features:
Controlled power feeds:
²Front airbag system
²Side airbag system
²Headlamp power
²EATX module power (4 speed only)
²Front washer motor
²Rear washer motor
²Brake shift interlock system
Relay controls:
²Fog lamp relay (when equipped)
²Park lamp relay
²Front wiper on relay
²Front wiper high/low relay
²Accessory relay
²Horn relay
²Front & rear blower relay
²Name brand speakers (NBS) relay
²Electronic back light (EBL) run only relay
²Cabin heater relayElectrical inputs:
²Headlamp battery supplies1&2
²Module battery supply
²Power ground
²Ignition switch RUN or START position status
²Ignition switch START only status
²PCI Bus
²Stop lamp switch
²Horn switch
²Back-up switch
²Wiper park switch
²Washer fluid level switch
²Brake fluid level switch
²Ambient temperature sensor
²Right park lamp outage
²Left park lamp outage
²Battery IOD
²Battery (+) connection detection
²Flash reprogramming voltage
3.8.1 CONTROLLED POWER FEEDS
Front airbag system
The FCM provides power to the Occupant Re-
straint Control (ORC) system through two ªfuse-
lessº circuits (ORC RUN/START, and ORC RUN
only). These circuits are electronically controlled
and continuously monitored for malfunctions.
Power is supplied while the ignition switch is in the
RUN and START positions on pin 48 of the FCM
connector, and in the RUN only position on pin 29.
Side airbag system
The FCM provides power to the Side Impact
Airbag Control Module (SIACM) system through
one ªfuselessº circuit. This circuit is electronically
controlled and continuously monitored for malfunc-
tions. Power is supplied in the ignition RUN and
START positions on pin 28 of the FCM connector.
Headlamp power
The headlamp switch is a direct input to the
BCM. The BCM sends a PCI Bus message to the
FCM informing it of a headlamp switch status
change. The FCM then turns on power to the
headlamps through four ªfuselessº circuits. These
circuits are electronically controlled and continu-
ously monitored for malfunctions. Power is supplied
to each filament in a separate circuit (RH low on pin
6, RH high on pin 4, LH low on pin 3 and LH high
on pin 5). For vehicles equipped with Daytime
Running Lamps (DRL), the FCM electronically
steps down the headlamp voltage to provide the
desired illumination.
13
GENERAL INFORMATION

Front and rear blower relay
The blower control switch is part of the Automatic
Temperature Control (ATC) or A/C-Heater Control
Module, (Manual Temp). When the blower switch is
turned on, the ATC or A/C-Heater Control Module
sends a PCI Bus message to the FCM. The front and
rear blower relay is then powered through low side
control on pin 30 of the FCM. The relay provides the
high side to the blower motor, and the blower speed
is governed through low side control in the ATC or
A/C-Heater Control Module. This circuit is electron-
ically controlled and continuously monitored for
malfunctions.
Name Brand Speakers (NBS) relay
The NBS relay operates through the vehicle bus
interface between the radio and the FCM. When the
radio is turned on, the radio sends a PCI Bus
message to the FCM. The NBS relay is then pow-
ered on through low side control on pin 11 of the
FCM. The relay supplies power to the amplified
speaker, and ground is supplied through the radio.
This circuit is electronically controlled and contin-
uously monitored for malfunctions.
Electronic Back Light (EBL) relay
The rear defrost switch is part of the Automatic
Temperature Control or A/C-Heater Control Module
(Manual Temp). When the ignition switch is in the
RUN position and the rear defrost switch is turned
on, the ATC or A/C-Heater Control Module sends a
PCI Bus message to the FCM. The EBL run only
relay is then powered through low side control on
pin 31 of the FCM. The relay provides the high side
to the rear window defrost grid, and ground is
attached to the vehicle body. The FCM will only
allow the rear defrost to operate in the RUN posi-
tion. This circuit is electronically controlled and
continuously monitored for malfunctions.
Cabin Heater Relay
When the ignition is in Run, the FCM monitors
the PCI bus for the Cabin Heater Activation re-
quest. The A/C ± Heater Control Module initiates
this request only when all conditions for Cabin
Heater activation are favorable. The request carries
the status bit that the FCM requires to activate its
Cabin Heater Assist Control output. This output is
a low side driver (coming from FCM pin 15) which
supplies a ground signal to the Cabin Heater (pin
5). When the Cabin Heater receives this ground
signal input, it interprets this as an activation
signal. The FCM low side driver is also capable of
diagnostic sensing. The driver will sense an open
circuit when the driver is off, and will sense a short
to voltage when the driver is on. The FCM will set
DTCs for both of these types of faults. For addi-
tional information, refer to Cabin Heater under
General Information and Diagnostic Procedures in
the manual.3.8.3 ELECTRICAL INPUTS
Headlamp battery supplies1&2Ð12 volt
input on pins 1 and 2. Battery supply voltage for
switching headlamp circuits only.
Module battery supply Ð12 volt input on pin 9.
Battery supply voltage for all other FCM opera-
tions.
Power ground ÐGround source on pin 8 for all
FCM operations.
Ignition switch RUN or START position status
Ð12 volt input on pin 37. Allows the FCM to
determine the ignition switch status for related
FCM operations.
Ignition switch START only status Ð12 volt
input on pin 19. Allows the FCM to discriminate
between RUN/START input and START for related
FCM operations.
PCI Bus ÐApproximately 7.5 volt input on pin 22.
Allows the FCM to communicate with other mod-
ules on the vehicle bus.
Stop lamp Switch status Ð12 volt input on pin
44. Provides for brake shift interlock function.
Horn Switch ÐGround input on pin 17. Primary
means for engaging the horn.
Back-up switch ÐGround input on pin 39. Input
is converted to a PCI Bus status message for use by
other modules.
Wiper park switch ÐGround input on pin 16.
Used to determine park placement of wipers. Also
used as feedback to FCM to determine correct
operating mode of wipers.
Washer fluid level switch ÐGround input to
pull-up on pin 18. Ground is switched into the
circuit when washer bottle fluid level is low.
Brake fluid level switch ÐGround input to
pull-up on pin 36. Ground is switched into the
circuit when brake fluid level is low.
Ambient temperature sensor ÐResistive input
to pull-up on pin 25. Corresponding voltage level is
converted to a PCI Bus message for use by other
modules on the bus.
Right park lamp outage Ð12 volt input on pin
21. Used to determine if right park lamp circuit is
operating properly.
Left park lamp outage Ð12 volt input on pin 41.
Used to determine if left park lamp circuit is
operating properly.
Battery IOD Ð12 volt input on pin 20. The FCM
enters a low power consumption mode when the
ignition is turned OFF. This low current draw
battery supply keeps the microprocessor function-
ing in the low power mode.
Battery (+) connection detection Ð12 volt
input on pin 38. The battery connection on the PDC
incorporates the use of an internal switch to deter-
mine if the connector is properly mated and the
Connector Positive Assurance (CPA) is engaged. If
15
GENERAL INFORMATION

CONTROLLER ANTILOCK BRAKE - BLACK 24 WAYCAV CIRCUIT FUNCTION
1 Z107 12BK/TN (EXCEPT
BUILT-UP-EXPORT/ 2.4L)GROUND
1 Z107 12BK/DG (OTHER) GROUND
2 B1 18DG/OR RIGHT REAR WHEEL SPEED SENSOR SIGNAL
3 B2 18DG/LB RIGHT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
4- -
5 D25 18WT/VT PCI BUS
6 B6 18DG/WT RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
7 B7 18DG/VT RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
8- -
9 A111 12DG/RD FUSED B(+)
10 F500 18DG/PK FUSED IGNITION SWITCH OUTPUT (RUN)
11 - -
12 - -
13 - -
14 - -
15 - -
16 Z127 12BK/DG GROUND
17 - -
18 L50 18WT/TN PRIMARY BRAKE SWITCH SIGNAL
19 B3 18DG/YL LEFT REAR WHEEL SPEED SENSOR SIGNAL
20 B4 18DG/GY LEFT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
21 - -
22 B8 18DG/TN LEFT FRONT WHEEL SPEED SENSOR SIGNAL
23 B9 18DG/LG LEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
24 A107 12TN/RD FUSED B(+)
DATA LINK CONNECTOR - BLACK 16 WAYCAV CIRCUIT FUNCTION
1- -
2 D25 20WT/VT PCI BUS
3- -
4 Z11 18BK/LG GROUND
5 Z111 18BK/WT (EXCEPT
BUILT-UP-EXPORT)GROUND
5 Z111 20BK/WT (BUILT-UP-
EXPORT)GROUND
6 D20 20WT/LG (GAS) SCI RECEIVE
7 D21 20WT/BR SCI TRANSMIT
8- -
9 D23 20WT/BR FLASH PROGRAM ENABLE
10 - -
11 - -
12 - -
13 - -
14 D16 20WT/OR (GAS) SCI RECEIVE
15 - -
16 A105 20DB/RD FUSED B(+)
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CONNECTOR PINOUTS

ENGINE CONTROL MODULE C1 (DIESEL) - BLACK 81 WAYCAV CIRCUIT FUNCTION
1 Z130 14BK/BR GROUND
2 Z131 14BK/DG GROUND
3 K20 14BR/GY GENERATOR FIELD CONTROL
4 K342 14BR/WT ECM/PCM RELAY OUTPUT
5 K342 14BR/WT ECM/PCM RELAY OUTPUT
6- -
7 D25 20WT/VT PCI BUS
8 K944 20BK/GY CAMSHAFT POSITION SENSOR SHIELD GROUND
9 K44 20DB/GY CAMSHAFT POSITION SENSOR SIGNAL
10 - -
11 K37 20DB/YL BOOST PRESSURE SENSOR SIGNAL
12 K55 20DB/OR MASS AIR FLOW SENSOR SIGNAL
13 K78 20GY FUEL PRESSURE SENSOR SIGNAL
14 - -
15 K22 20OR/DB ACCELERATOR PEDAL POSITION SENSOR SIGNAL
16 K80 20DB/TN FUEL PRESSURE SENSOR GROUND
17 - -
18 - -
19 N1 20DB/OR FUEL HEATER RELAY OUTPUT
20 Z138 20BK/OR GROUND
21 K900 20DB/DG SENSOR GROUND
22 F202 20PK/GY IGNITION SWITCH OUTPUT (RUN-START)
23 F851 20LB/PK SENSOR REFERENCE VOLTAGE B
24 K3 20BR/OR CRANKSHAFT POSITION SENSOR SIGNAL NO. 1
25 - -
26 - -
27 - -
28 - -
29 - -
30 G6 20VT/GY ENGINE OIL PRESSURE SENSOR SIGNAL
31 F853 20LG/PK WATER IN FUEL SENSOR SIGNAL
32 K25 20BR/TN BATTERY TEMPERATURE SENSOR SIGNAL
33 - -
34 K167 20BR/YL ACCELERATOR PEDAL POSITION SENSOR GROUND
35 K853 20DB/BR ACCELERATOR PEDAL POSITION SENSOR 5 VOLT SUPPLY
36 C18 20LB/BR A/C PRESSURE SENSOR SIGNAL
37 K89 20DB/WT ENGINE OIL TEMPERATURE SENSOR SIGNAL
38 V37 20VT/TN SPEED CONTROL SWITCH SIGNAL
39 - -
40 K2 20TN/BK ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
41 K21 20DB/LG INTAKE AIR TEMPERATURE SENSOR SIGNAL
42 Z122 18WT GROUND (DRAIN)
43 K24 20BR/LB CRANKSHAFT POSITION SENSOR SIGNAL NO. 2
44 - -
45 - -
46 - -
47 L50 20WT/TN PRIMARY BRAKE SWITCH SIGNAL
48 B29 20DG/WT SECONDARY BRAKE SWITCH SIGNAL
49 T751 20YL IGNITION SWITCH OUTPUT (START)
50 F855 20PK/YL SENSOR REFERENCE VOLTAGE A
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CONNECTOR PINOUTS

INSTRUMENT CLUSTER - BLACK 13 WAYCAV CIRCUIT FUNCTION
1 E13 20OR/YL PANEL LAMPS DRIVER
2 L160 20WT/TN (LOW
LINE)RIGHT TURN INDICATOR DRIVER
3 G7 20VT/GY (HIGH LINE) LOW OIL PRESSURE INDICATOR DRIVER
4 G3 20VT/LB (HIGH LINE) MALFUNCTION INDICATOR LAMP DRIVER
5 L134 20WT/GY (HIGH
LINE)HIGH BEAM INDICATOR DRIVER
6 A701 16BR/RD FUSED B(+) (HAZARD)
7 Z108 18BK/LG GROUND
8 L161 20WT/LG (LOW
LINE)LEFT TURN INDICATOR DRIVER
9 D25 20WT/VT PCI BUS
10 B25 20DG/WT (RHD) PARK BRAKE SWITCH SENSE
10 B25 16DG/WT (LHD) PARK BRAKE SWITCH SENSE
11 G26 20VT/OR CHIME DRIVER
12 G150 20VT/BR INSTRUMENT CLUSTER WAKE UP SENSE
13 Z18 18BK/LB GROUND
INTELLIGENT POWER MODULE C1 - LT. GREEN/RED 20 WAYCAV CIRCUIT FUNCTION
1 F301 18VT/PK FUSED ACCESSORY RELAY OUTPUT
2- -
3- -
4 L43 18WT/DB LEFT LOW BEAM DRIVER
5 Z344 16BK/TN GROUND
6 L34 16WT/GY RIGHT HIGH BEAM DRIVER
7 W1 18BR/TN WASHER FLUID LEVEL SWITCH SENSE
8 L33 18WT/LG LEFT HIGH BEAM DRIVER
9 G31 18VT/LG (EXCEPT
BASE)AMBIENT TEMPERATURE SENSOR SIGNAL
10 L44 16WT/TN RIGHT LOW BEAM DRIVER
11 F300 18OR/PK FUSED ACCESSORY RELAY OUTPUT
12 - -
13 Z343 18BK/LG GROUND
14 - -
15 L78 18WT/OR FUSED PARK LAMP RELAY OUTPUT (RIGHT)
16 L77 18WT/BR FUSED PARK LAMP RELAY OUTPUT (LEFT)
17 - -
18 G931 18VT/BR (EXCEPT
BASE)AMBIENT TEMPERATURE SENSOR RETURN
19 W20 18BR/YL REAR WASHER PUMP MOTOR CONTROL
20 W10 18BR FRONT WASHER PUMP MOTOR CONTROL
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CONNECTOR PINOUTS

FRONT CONTROL MODULE - BLACK 49 WAYCAV CIRCUIT FUNCTION
1 A1 B(+)
2 A1 B(+)
3 L43 LEFT LOW BEAM DRIVER
4 L34 RIGHT HIGH BEAM DRIVER
5 L33 LEFT HIGH BEAM DRIVER
6 L44 RIGHT LOW BEAM DRIVER
7 - NOT USED
8 Z117, Z118, Z343, Z344 GROUND
9 A1 B(+)
10 FCM 10 HORN RELAY CONTROL
11 FCM 11 NAME BRAND SPEAKER RELAY CONTROL
12 - SPARE
13 FCM 13 PARK LAMP RELAY CONTROL
14 FCM 14 FRONT WIPER ON/OFF RELAY CONTROL
15 C41 (DIESEL) CABIN HEATER ASSIST CONTROL
16 W7 FRONT WIPER PARK SWITCH SENSE
17 X3 HORN SWITCH SENSE
18 W1 WASHER FLUID LEVEL SWITCH SENSE
19 FCM 19 (GAS) IGNITION SWITCH OUTPUT (START)
20 A114 FUSED B(+) (I.O.D.)
21 L78 FUSED PARK LAMP RELAY OUTPUT (RIGHT)
22 D25 PCI BUS
23 G931 AMBIENT TEMPERATURE SENSOR RETURN
24 - SPARE
25 G31 AMBIENT TEMPERATURE SENSOR SIGNAL
26 L13 (RG) HEADLAMP ADJUST SIGNAL
27 F1, F2 FCM OUTPUT (UNLOCK-RUN-START)
28 F214 FCM OUTPUT (RUN-START) (SIACM)
29 F100 FCM OUTPUT (RUN) (ORC)
30 FCM 30 FRONT/REAR BLOWER MOTOR RELAY CONTROL
31 FCM 31 REAR WINDOW DEFOGGER RELAY CONTROL
32 FCM 32 (BUILT-UP-
EXPORT))HEADLAMP WASHER RELAY CONTROL
33 FCM 33 FRONT FOG LAMP RELAY CONTROL
34 FCM 34 FRONT WIPER HIGH/LOW RELAY CONTROL
35 FCM 35 ACCESSORY RELAY CONTROL (RUN-ACC)
36 B20 BRAKE FLUID LEVEL SWITCH SENSE
37 F20 IGNITION SWITCH OUTPUT (RUN-START)
38 A1 B(+)
39 T2 TRS REVERSE SENSE
40 T753 (DIESEL) IGNITION SWITCH OUTPUT (START)
41 L77 FUSED PARK LAMP RELAY OUTPUT (LEFT)
42 D23 FLASH PROGRAM ENABLE
43 Z116 GROUND
44 L50 PRIMARY BRAKE SWITCH SIGNAL
45 W10 FRONT WASHER PUMP MOTOR CONTROL
46 W20 REAR WASHER PUMP MOTOR CONTROL
47 K32 BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID CONTROL
48 F201 FCM OUTPUT (RUN-START) (ORC)
49 - NOT USED
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CONNECTOR PINOUTS

POWERTRAIN CONTROL MODULE C2 (2.4L/3.3L/3.8L) - GRAY/GRAY 40 WAYCAV CIRCUIT FUNCTION
41 V37 18VT SPEED CONTROL SWITCH SIGNAL
42 C18 18LB/BR A/C PRESSURE SENSOR SIGNAL
43 K900 18DB/DG SENSOR GROUND
44 F888 18BR/PK 8 VOLT SUPPLY
45 - -
46 A109 18OR/RD FUSED B(+)
47 - -
48 K40 18BR/LG (2.4L) IDLE AIR CONTROL NO. 3 DRIVER
49 K60 18VT/LG (2.4L) IDLE AIR CONTROL NO. 2 DRIVER
49 K39 18VT/DG (3.3L/3.8L) IDLE AIR CONTROL NO. 1 DRIVER
50 Z131 18BK/DG GROUND
51 K141 18DB/YL OXYGEN SENSOR 1/2 SIGNAL
52 - -
53 - -
54 - -
55 - -
56 V36 18VT/YL SPEED CONTROL VACUUM SOLENOID CONTROL
57 K39 18VT/DG (2.4L) IDLE AIR CONTROL NO. 1 DRIVER
57 K60 18VT/LG (3.3L/3.8L) IDLE AIR CONTROL NO. 2 DRIVER
58 K59 18BR/DG (2.4L) IDLE AIR CONTROL NO. 4 DRIVER
59 D25 18WT/VT PCI BUS
60 - -
61 F855 18PK/YL 5 VOLT SUPPLY
62 B29 18DG/WT SECONDARY BRAKE SWITCH SIGNAL
63 T10 18DG/LG (EATX) TORQUE MANAGEMENT REQUEST SENSE
64 C13 18LB/OR A/C COMPRESSOR CLUTCH RELAY CONTROL
65 D21 18WT/BR SCI TRANSMIT
66 N7 18DB/OR VEHICLE SPEED SENSOR SIGNAL
67 K51 18BR/WT AUTOMATIC SHUTDOWN RELAY CONTROL
68 K52 18DB/WT EVAPORATIVE EMISSION SOLENOID CONTROL
69 - -
70 K70 18DB/BR EVAPORATIVE EMISSION SOLENOID SENSE
71 - -
72 K107 18VT/WT (EXCEPT
BUILT-UP-EXPORT)LEAK DETECTION PUMP SWITCH SENSE
73 K173 18BR/VT RADIATOR FAN RELAY CONTROL
74 K31 18BR FUEL PUMP RELAY CONTROL
75 D20 18WT/LG SCI RECEIVE
76 T41 18YL/DB PARK/NEUTRAL POSITION SWITCH SENSE (TRS T41)
77 K106 18VT/LB (EXCEPT
BUILT-UP-EXPORT)LEAK DETECTION PUMP SOLENOID CONTROL
78 K54 18DB/WT (ATX) TORQUE CONVERTER CLUTCH SOLENOID CONTROL
79 - -
80 V35 18VT/OR SPEED CONTROL VENT SOLENOID CONTROL
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CONNECTOR PINOUTS

TABLE OF CONTENTS
1.0 INTRODUCTION.........................................................1
1.1SYSTEM COVERAGE...............................................1
1.2SIX-STEP TROUBLESHOOTING PROCEDURE..........................1
2.0 IDENTIFICATION OF SYSTEM.............................................1
3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION......................1
3.1TEVES MARK 20 SYSTEM DESCRIPTION..............................1
3.2TRACTION CONTROL SYSTEM (TCS) DESCRIPTION....................1
3.3SYSTEM COMPONENTS.............................................2
3.3.1ABS AND BRAKE WARNING INDICATORS.......................2
3.3.2CONTROLLER ANTILOCK BRAKE (CAB)........................2
3.3.3HYDRAULIC CONTROL UNIT..................................3
3.3.4SWITCHES/SENSORS........................................3
3.3.5SYSTEM INITIALIZATION.....................................3
3.3.6DIAGNOSTIC MODE.........................................4
3.4DIAGNOSTIC TROUBLE CODES......................................4
3.5DRBIIITERROR MESSAGES AND BLANK SCREEN......................4
3.5.1DRBIIITDOES NOT POWER UP................................4
3.5.2DISPLAY IS NOT VISIBLE.....................................4
4.0 DISCLAIMERS, SAFETY, WARNINGS.......................................5
4.1DISCLAIMERS......................................................5
4.2SAFETY...........................................................5
4.2.1TECHNICIAN SAFETY INFORMATION...........................5
4.2.2VEHICLE PREPARATION FOR TESTING.........................5
4.2.3SERVICING SUB-ASSEMBLIES................................5
4.2.4DRBIIITSAFETY INFORMATION...............................5
4.3WARNINGS........................................................6
4.3.1VEHICLE DAMAGE WARNINGS................................6
4.3.2ROAD TESTING A COMPLAINT VEHICLE........................6
4.4DIAGNOSIS........................................................6
5.0 REQUIRED TOOLS AND EQUIPMENT......................................6
6.0 GLOSSARY OF TERMS...................................................7
7.0 DIAGNOSTIC INFORMATION AND PROCEDURES............................9
BRAKES (CAB)
BUS SYSTEM COMMUNICATION FAILURE.................................10
CAB INTERNAL FAILURE................................................11
CLUSTER LAMP FAILURE................................................12
LEFT FRONT SENSOR CIRCUIT FAILURE..................................14
LEFT REAR SENSOR CIRCUIT FAILURE...................................14
RIGHT FRONT SENSOR CIRCUIT FAILURE.................................14
RIGHT REAR SENSOR CIRCUIT FAILURE..................................14
LEFT FRONT WHEEL SPEED SIGNAL FAILURE.............................17
LEFT REAR WHEEL SPEED SIGNAL FAILURE..............................19
PUMP CIRCUIT FAILURE................................................21
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE............................24
i

TABLE OF CONTENTS - Continued
RIGHT REAR WHEEL SPEED SIGNAL FAILURE.............................26
SYSTEM OVERVOLTAGE................................................28
SYSTEM UNDERVOLTAGE...............................................30
VALVE POWER FEED FAILURE...........................................32
*BRAKE LAMP SWITCH..................................................35
*TRAC OFF INDICATOR NEVER/ALWAYS ON...............................36
*TRAC ON INDICATOR NEVER/ALWAYS ON................................39
VERIFICATION TESTS
VERIFICATION TESTS...................................................40
8.0 COMPONENT LOCATIONS...............................................41
8.1CONTROLLER ANTILOCK BRAKE (CAB)..............................41
8.2DATA LINK CONNECTOR...........................................41
8.3FUSES...........................................................42
8.4TRACTION CONTROL SWITCH......................................42
8.4.1TRACTION CONTROL INDICATORS...........................43
8.5WHEEL SPEED SENSORS..........................................43
8.5.1FRONT....................................................43
8.5.2REAR.....................................................44
8.5AWHEEL SPEED SENSOR CONNECTORS..............................44
8.5A.1FRONT....................................................44
8.5A.2REAR.....................................................45
8.6BRAKE LAMP SWITCH.............................................45
9.0 CONNECTOR PINOUTS.................................................47
CONTROLLER ANTILOCK BRAKE - BLACK 24 WAY..........................47
DATA LINK CONNECTOR - WHITE 16 WAY.................................47
DIAGNOSTIC JUNCTION PORT - BLACK 16 WAY............................48
INTELLIGENT POWER MODULE C4 - GRAY 10 WAY.........................48
LEFT FRONT WHEEL SPEED SENSOR - BLACK 2 WAY......................48
LEFT FRONT WHEEL SPEED SENSOR CONNECTOR (SENSOR SIDE)-2WAY..49
LEFT REAR WHEEL SPEED SENSOR - BLACK 2 WAY........................49
LEFT REAR WHEEL SPEED SENSOR CONNECTOR (SENSOR SIDE)-2WAY ...49
FUSES (IPM)...........................................................51
PUMP MOTOR CONNECTOR-2WAY.....................................52
RIGHT FRONT WHEEL SPEED SENSOR - GRAY 2 WAY......................52
RIGHT FRONT WHEEL SPEED SENSOR CONNECTOR
(SENSOR SIDE)-2WAY.................................................52
RIGHT REAR WHEEL SPEED SENSOR - BLACK 2 WAY......................52
RIGHT REAR WHEEL SPEED SENSOR CONNECTOR (SENSOR SIDE)-2WAY..53
TRACTION CONTROL SWITCH - BLACK 2 WAY.............................53
10.0 SCHEMATIC DIAGRAMS.................................................55
TEVES MARK 20 ANTILOCK BRAKE SYSTEM........................55
ii

The cycling of the build and decay valves is
similar to the ABS except that they work to control
wheel spin by applying brakes. ABS function is to
control wheel skid by releasing brakes.
Two pressure relief valves allow excess fluid vol-
ume to return to the reservoir when not used by the
build/decay cycles. These are required because the
pump supplies more volume than the traction con-
trol system requires.
If at any time the brake pedal is applied during a
traction control cycle, the brake lamp switch will
trigger the CAB to switch off the traction control.
The traction control system will be enabled at
each ignition cycle. It may be turned off by depress-
ing the Traction Control Switch. The traction con-
trol system function lamp will illuminate ªTRAC
OFFº immediately upon depressing the traction
control switch button. Only the ªTRACº portion of
the ªTRAC OFFº indicator will illuminate during a
traction control event. If the CAB calculates that
the brake temperatures are high, the traction con-
trol system will become inoperative until a time-out
period has elapsed. When in this thermal protection
mode, the traction control ªTRAC OFFº lamp will
illuminate; however, a fault will not be registered.
3.3 SYSTEM COMPONENTS
²controller antilock brake (CAB)
²vacuum booster
²master cylinder
²ABS integrated electronic control module/
hydraulic control unit (HCU), valve block assem-
bly: 8 valve solenoids (4 inlet valves, 4 outlet
valves, 2 accumulators) 1 motor, 2 pump
²ABS integrated electronic control module with
traction control same as above but has 10 valve
solenoids.
²4 wheel speed sensor/tone wheel assemblies
²ABS warning indicator
²fuses and wiring harness
²fluid reservoir
²TRAC/TRAC OFF indicator
3.3.1 ABS AND BRAKE WARNING
INDICATORS
The amber ABS warning indicator is located in
the instrument cluster. It is used to inform the
driver that the antilock function has been turned
off. The ABS warning indicator is controlled by the
CAB. The CAB controls the lamp with a command
over the PCI bus.
The ABS Warning Indicator will remain lit during
every key cycle until a circuit or component fault is
repaired and the CAB no longer detects the fault.After repair of a sensor signal fault or a pump motor
fault, the CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS and
TRAC OFF Indicators.
The Instrument Cluster will illuminate the ABS
Warning Indicator if it loses communication with
the CAB.
The red BRAKE warning indicator is also located
in the instrument cluster. It can be activated in
several ways. Application of the parking brake or a
low fluid signal from the fluid level switch located in
the master cylinder reservoir will cause the indica-
tor to come on.
3.3.2 CONTROLLER ANTILOCK BRAKE
(CAB)
The Controller Antilock Brake (CAB) is a
microprocessor-based device that monitors wheel
speeds and controls the antilock functions. The
CAB contains two microprocessors that receive
identical sensor signals and then independently
process the information. The results are then com-
pared to make sure that they agree. Otherwise, the
CAB will turn off the antilock and turn on the ABS
amber warning indicator.
The primary functions of the CAB are to:
²detect wheel locking tendencies
²control fluid pressure modulation to the brakes
during antilock stop
²monitor the system for proper operation
²manage traction control functions
²provide communication to the DRBIIItwhile in
diagnostic mode
²store diagnostic information in non-volatile memory
The CAB continuously monitors the speed of each
wheel. When a wheel locking tendency is detected,
the CAB will command the appropriate valve to
modulate brake fluid pressure in its hydraulic unit.
Brake pedal position is maintained during an an-
tilock stop by being a closed system with the use of
2 accumulators. The CAB continues to control pres-
sure in individual hydraulic circuits until a wheel
locking tendency is no longer present. The CAB
turns on the pump motor during an antilock stop.
The antilock brake system is constantly moni-
tored by the CAB for proper operation. If the CAB
detects a system malfunction, it can disable the
antilock system and turn on the ABS warning
indicator. If the antilock function is disabled, the
system will revert to standard base brake system
operation.
The CAB inputs include the following:
²diagnostic communication
²four wheel speed sensors
2
GENERAL INFORMATION