Jeep XJ. Manual — part 581
Symptom:
*ABS WARNING INDICATOR ALWAYS ON
POSSIBLE CAUSES
ABS RELAY STUCK
ABS RELAY FUSED B+ CIRCUIT OPEN
ABS RELAY CONTROL CIRCUIT OPEN
CAB INTERNAL OPEN
ABS INDICATOR DRIVER SHORT TO GROUND
INSTRUMENT CLUSTER CONCERN
TEST
ACTION
APPLICABILITY
1
Remove the ABS relay from PDC.
Perform the key-on bulb test.
Does the ABS Indicator light and remain lit?
All
Yes
→
No
→
2
Disconnect the Instrument Cluster C1 harness connector.
Remove the ABS relay from the PDC.
Using a 12-volt test light connected to 12-volts, check the ABS Warning Indicator
Driver circuit.
Does the test light illuminate?
All
Yes
→
Repair the ABS Indicator circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Refer to symptom list for problems related to Instrument Cluster.
Perform ABS VERIFICATION TEST - VER 1.
3
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
→
4
Remove the ABS relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Does the test light illuminate?
All
Yes
→
No
→
Repair the ABS relay Fused B+ circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
55
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
5
Remove the ABS relay.
Disconnect the CAB harness connector.
Measure the resistance of the ABS Relay Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Repair the ABS Relay Control circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
56
BRAKES (CAB)
*ABS WARNING INDICATOR ALWAYS ON —
Continued
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
→
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
→
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
→
No
→
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
→
No
→
Repair the ABS relay Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
57
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
→
7
Disconnect the Instrument Cluster C1 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.
58
BRAKES (CAB)
*ABS WARNING INDICATOR INOPERATIVE —
Continued
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