Jeep XJ. Manual — part 541
Symptom:
WARNING LAMP OPEN - SHORT - ACTIVE
When Monitored and Set Condition:
WARNING LAMP OPEN - SHORT - ACTIVE
When Monitored:
With ignition On, or the ACM needs to turn the lamp on because of
detection of a code, or during a lamp check.
Set Condition:
With voltage and current on, the airbag warning lamp driver circuit is
other than expected.
POSSIBLE CAUSES
MIC DRIVER STATUS
INSPECT AIRBAG LAMP
ACM, AIRBAG INDICATOR OPEN/SHORT
ACM, INDICATOR DRIVER SHORT
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t select PASSIVE RESTRAINTS, AIRBAG, MONITOR DISPLAY
and WARNING LAMP STATUS.
With the DRBIII
t, read the MIC BULB STATE monitor.
Does the DRB show MIC BULB STATE: OK ?
All
YES
NO
2
With the DRBIII
t select PASSIVE RESTRAINTS, AIRBAG and MONITOR DIS-
PLAY, WARNING LAMP STATUS.
With the DRBIII
t, read the MIC DRIVER STATE monitor.
Does the DRBIII
t show MIC DRIVER STATE: OK ?
All
YES
Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
NO
Replace the Instrument Cluster.
Perform AIRBAG VERIFICATION TEST - VER 1.
44
AIRBAG
TEST
ACTION
APPLICABILITY
3
Remove and inspect the airbag indicator bulb from the Instrument Cluster.
Is the airbag bulb open?
All
YES
Replace the Airbag indicator bulb.
Perform BODY VERIFICATION TEST - VER 1.
NO
Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
45
AIRBAG
WARNING LAMP OPEN - SHORT - ACTIVE —
Continued
Symptom:
*AIRBAG INDICATOR ON WITHOUT ACTIVE TROUBLE CODES
POSSIBLE CAUSES
INSTRUMENT CLUSTER PROBLEMS
AIRBAG INDICATOR ON WITHOUT TROUBLE CODES
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t select MONITOR DISPLAY, WARNING LAMP STATUS and read
the PASSIVE RESTRAINTS, AIRBAG, MONITOR DISPLAY, PASSIVE RE-
STRAINTS, AIRBAG, MONITOR DISPLAY, WARNING LAMP STATUS.
With no active DTCs, Does the ACM LAMP REQ: display ON?
All
Yes
→
Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
No
→
Refer to symptom list for problems related to Instrument Cluster.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.
46
AIRBAG
Symptom:
*BUS (+) AND BUS (-) OPEN
POSSIBLE CAUSES
DRB OR DRB CABLE
CCD BUS (+) OR BUS (-) CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
Disconnect the DRB from the Data Link Connector (DLC).
Measure the voltage of the CCD Bus (+) and the CCD Bus (-) circuits in the DLC.
Is the voltage between 1.8 and 2.8 volts on both circuits?
All
Yes
→
Repair/Replace the DRB or DRB cable as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
Turn the ignition off.
Remove the Instrument Cluster.
Measure the resistance of the CCD Bus (+) and the CCD Bus (-) circuits between the
Instrument Cluster C2 harness connector and the DLC.
Is the resistance below 5.0 ohms on both circuits?
All
Yes
→
No
→
Repair the CCD Bus (+) or CCD Bus (-) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
47
COMMUNICATION
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