Jeep XJ. Manual — part 543
TEST
ACTION
APPLICABILITY
9
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.
10
Turn the ignition off.
Disconnect the negative battery cable.
Remove the Instrument Cluster.
Measure the resistance between ground and the CCD Bus (+) and the CCD Bus (-)
circuits.
Is the resistance below 1000.0 ohms on either circuit?
All
Yes
→
Repair the CCD Bus (+) or CCD Bus (-) circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→
11
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
52
COMMUNICATION
*BUS BIAS LEVEL TOO HIGH —
Continued
Symptom:
*BUS BIAS LEVEL TOO LOW
POSSIBLE CAUSES
DRB OR DRB CABLE
POWERTRAIN CONTROL MODULE
AIRBAG CONTROL MODULE
SENTRY KEY IMMOBILIZER MODULE (IF EQUIPPED)
REMOTE KEYLESS ENTRY MODULE (IF EQUIPPED)
OVERHEAD CONSOLE (IF EQUIPPED)
TRANSMISSION CONTROL MODULE (IF EQUIPPED)
GROUND CIRCUIT OPEN
CCD BUS (+) OR BUS (-) CIRCUIT OPEN
CCD BUS (+) OR BUS (-) CIRCUIT SHORTED TO GROUND
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.
Disconnect the PCM C3 harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Powertrain Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO
MINUTES BEFORE PROCEEDING.
Disconnect the ACM harness connector.
TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Airbag Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
53
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the SKIM harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Sentry Key Immobilizer Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the RKE Module harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Remote Keyless Entry Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the Compass Mini Trip Computer (overhead console) harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Compass Mini Trip Computer (Overhead Console).
Perform BODY VERIFICATION TEST - VER 1.
No
→
7
Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Transmission Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
8
Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
NOTE: Ensure the interior lights are off.
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 BODY VERIFICATION TEST - VER 1.
54
COMMUNICATION
*BUS BIAS LEVEL TOO LOW —
Continued
TEST
ACTION
APPLICABILITY
9
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.
10
Turn the ignition off.
Disconnect the negative battery cable.
Remove the Instrument Cluster.
Measure the resistance between ground and the CCD Bus (+) and the CCD Bus (-)
circuits.
Is the resistance below 1000.0 ohms on either circuit?
All
Yes
→
Repair the CCD Bus (+) or CCD Bus (-) circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→
11
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
55
COMMUNICATION
*BUS BIAS LEVEL TOO LOW —
Continued
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