Jeep XJ. Manual — part 544
Symptom:
*NO BUS BIAS FAILURE
POSSIBLE CAUSES
DRB OR DRB CABLE
INSPECT JUNCTION BLOCK FUSE #9
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
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 and inspect Fuse #9 in the Junction Block.
Is the fuse open?
All
Yes
→
Refer to the wiring diagrams located in the service information to
help isolate a possible short to ground on the Fused Ignition
Switch Output circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
Turn the ignition off.
NOTE: Ensure Fuse #9 is installed in the Junction Block.
Disconnect the Instrument Cluster C1 harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
56
COMMUNICATION
Symptom:
*NO RESPONSE FROM AIRBAG CONTROL MODULE
POSSIBLE CAUSES
GROUND CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
AIRBAG CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
WARNING: Turn the ignition off, disconnect the battery and wait two
minutes before proceeding.
NOTE: When reconnecting the ACM, the ignition must be off and the battery
must be disconnected.
WARNING: If the ACM is dropped at any time, it must be replaced.
NOTE: Ensure both fuse #26 and fuse #27 are not open before continuing.
Turn the ignition off.
Disconnect the ACM harness connector.
Measure the resistance between ground and the ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
2
WARNING: Turn the ignition off, disconnect the battery and wait two
minutes before proceeding.
NOTE: When reconnecting the ACM, the ignition must be off and the battery
must be disconnected.
WARNING: If the ACM is dropped at any time, it must be replaced.
NOTE: Ensure both fuse #26 and fuse #27 are not open before continuing.
Disconnect the ACM harness connector.
Connect a jumper wire between the CCD Bus (+) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (+) circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
57
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
WARNING: Turn the ignition off, disconnect the battery and wait two
minutes before proceeding.
NOTE: When reconnecting the ACM, the ignition must be off and the battery
must be disconnected.
WARNING: If the ACM is dropped at any time, it must be replaced.
NOTE: Ensure both fuse #26 and fuse #27 are not open before continuing.
Disconnect the ACM harness connector.
Connect a jumper wire between the CCD Bus (-) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (-) circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Airbag Control Module.
Perform AIRBAG VERIFICATION TEST - VER 1.
58
COMMUNICATION
*NO RESPONSE FROM AIRBAG CONTROL MODULE —
Continued
Symptom:
*NO RESPONSE FROM COMPASS MINI TRIP COMPUTER (OVER-
HEAD CONSOLE)
POSSIBLE CAUSES
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
COMPASS MINI TRIP COMPUTER (OVERHEAD CONSOLE)
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the Overhead Console harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
2
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the Overhead Console harness connector.
Connect a jumper wire between the CCD Bus (+) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the Overhead Console harness connector.
Connect a jumper wire between the CCD Bus (-) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (-) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
59
COMMUNICATION
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