Jeep Wrangler TJ. Manual — part 61
Symptom:
*ABS WARNING INDICATOR INOPERATIVE
POSSIBLE CAUSES
INSTRUMENT CLUSTER CONCERN
ABS RELAY STUCK
ABS RELAY GROUND CIRCUIT OPEN
ABS RELAY CONTROL CIRCUIT SHORT TO GROUND
CAB INTERNAL SHORT TO GROUND
ABS INDICATOR BULB OPEN
ABS INDICATOR DRIVER OPEN
INSTRUMENT CLUSTER INTERNAL OPEN
TEST
ACTION
APPLICABILITY
1
Perform the key-on bulb check.
Do all bulbs check OK except for the ABS Warning Indicator?
All
Yes
→ Go To 2
No
→ Refer to symptom list for problems related to Instrument Cluster.
Perform ABS VERIFICATION TEST - VER 1.
2
Install a substitute relay in place of the ABS relay.
Perform the key-on bulb check.
Does the ABS Warning Indicator operate OK?
All
Yes
→ Replace the ABS relay.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Remove the ABS relay from PDC.
Connect a jumper wire between the ABS Warning Indicator driver cavity of the ABS
relay socket and ground.
Key to RUN
Does the ABS Indicator light?
All
Yes
→ Go To 4
No
→ Go To 6
4
Remove the ABS relay from the PDC.
Using a 12-volt test light connected to 12-volts, check the ABS relay ground circuit.
Does the test light illuminate?
All
Yes
→ Go To 5
No
→ Repair the ABS relay Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
35
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
5
Remove the ABS relay.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, check the ABS Relay Control circuit.
Does the test light illuminate?
All
Yes
→ Repair the ABS Relay Control circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
6
Install a substitute bulb in place of the ABS Indicator bulb.
Perform the key-on bulb check.
Does the ABS bulb illuminate?
All
Yes
→ Replace the ABS indicator bulb.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Disconnect the Instrument Cluster C2 harness connector.
Remove the ABS relay from the PDC.
Measure the resistance of the ABS Indicator driver circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster in accordance with the Service
Information..
Perform ABS VERIFICATION TEST - VER 1.
No
→ Repair the ABS Indicator Driver circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
36
BRAKES (CAB)
*ABS WARNING INDICATOR INOPERATIVE —
Continued
Symptom:
*BRAKE LAMP SWITCH
POSSIBLE CAUSES
CHECK BRAKE LAMP SWITCH OUTPUT
BRAKE LAMP SWITCH B+ OPEN
BRAKE LAMP SWITCH OUTPUT CIRCUIT SHORT OR OPEN
BRAKE LAMP SWITCH OPEN
CAB -- INTERNAL OPEN
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t in Inputs/Outputs, read the Brake Lamp Switch state.
Press and release the brake pedal.
Does the DRBIII
t display PRESSED and RELEASED?
All
Yes
→ The Brake Lamp Switch is OK.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, check the Brake Lamp Switch Fused
B+ circuit.
Does the test light illuminate brightly ?
All
Yes
→ Go To 3
No
→ Repair the Brake Lamp Switch Fused B+ circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
3
Disconnect the Brake Lamp Switch harness connector.
Connect a jumper wire between the Brake Lamp Switch B+ and Output circuits.
With the DRBIII
t in Inputs/Outputs, read the Brake Lamp Switch state.
Does the DRBIII
t display PRESSED?
All
Yes
→ Replace the Brake Lamp Switch in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Disconnect the CAB harness connector.
Disconnect the Brake Lamp Switch harness connector.
Check the Brake Lamp Switch Output circuit for a short to voltage and an open.
Is the Brake Lamp Switch Output circuit shorted or open?
All
Yes
→ Repair the Brake Lamp Switch Output circuit for a short to
voltage or an open.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Replace the Controller Anti-Lock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
37
BRAKES (CAB)
Symptom:
*FRONT AXLE LOCK INDICATOR REMAINS FLASHING
POSSIBLE CAUSES
CHECKING OPERATION
INTERMITTENT CONDITION
FUSED B(+) CIRCUIT OPEN TO THE FRONT LOCKER RELAY
FRONT LOCKER RELAY
FRONT LOCKER RELAY OUTPUT CIRCUIT OPEN
FRONT LOCKER PUMP GROUND CIRCUIT OPEN
FRONT LOCKER PUMP
FRONT LOCKER INDICATOR SWITCH SENSE CIRCUIT OPEN
FRONT LOCKER INDCATOR SWITCH GROUND CIRCUIT OPEN
MECHANICAL FAULT EXISTS
TEST
ACTION
APPLICABILITY
1
NOTE: For this test to be valid the Rear Axle must be locked and the Rear
Lock indicator must be illuminated.
Turn the ignition on.
Ensure Transfer Case is in 4
9LOW9 range.
Vehicle speed is less than 16km/h (10 mph).
Depress the Axle Lock Switch once.
Does the Front Axle Lock indicator remain flashing?
All
Yes
→ Go To 2
No
→ The condition is not present at this time. Monitor DRBIIIt
parameters while wiggling the related wiring harness. Refer to
any Technical Service Bulletins(TSB) that may apply. Visually
inspect the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Front Locker Relay.
Measure the voltage of the Fused B(+) circuit in the Front Locker Relay PDC
connector.
Is the voltage above 10 volts?
All
Yes
→ Go To 3
No
→ Repair the Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Replace the Front Locker Relay with a known good part.
Turn the ignition on.
Ensure Transfer Case is in 4
9LOW9 range.
Depress the Axle Lock Switch once.
Did the Front Locker Pump turn ON?
All
Yes
→ Replace the Front Locker Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
38
BRAKES (CAB)
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