Jeep XJ. Manual — part 542
Symptom:
*BUS (+) AND BUS (-) SHORTED TOGETHER
POSSIBLE CAUSES
BUS SYSTEM MODULE/COMPONENT INTERNALLY SHORTED
BUS (+) AND BUS (-) CIRCUITS SHORTED TOGETHER
DRB/DRB CABLE BUS (+) AND BUS (-) SHORTED TOGETHER
TEST
ACTION
APPLICABILITY
1
Ensure the ignition key is off while disconnecting the following Modules.
Disconnect the following Components (if equipped) one at a time in an orderly
manner (be sure to turn the ignition off before disconnecting any Module). After
disconnecting, turn the ignition back on.
Observe the DRB Bus Test message for a change after each Module is disconnected
which will identify that module as being the cause of the original Bus Failure
Message.
Disconnect the PCM C3 harness connector.
Disconnect the TCM harness connector.
Disconnect the SKIM harness connector.
Disconnect the RKE Module harness connector.
Disconnect the Overhead Console harness connector.
Disconnect the Instrument Cluster C2 harness connector.
TURN IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES
BEFORE PROCEEDING.
Disconnect the ACM harness connector.
TURN IGNITION ON, THEN RECONNECT THE BATTERY.
Did the DRB display a different bus message after disconnecting any one module/
component?
All
Yes
→
Replace the Module/Component causing the BUS FAILURE
MESSAGE.
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
All modules must be disconnected from the CCD Bus circuit at this time.
Measure the resistance between the CCD Bus (+) circuit and the CCD Bus (-) circuit
at the Data Link connector.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the CCD Bus (+) circuit for a short to the CCD Bus (-)
circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
If there are no possible causes remaining, view repair.
All
Repair
Repair/Replace the DRB or DRB cable as necessary.
Perform BODY VERIFICATION TEST - VER 1.
48
COMMUNICATION
Symptom:
*BUS (+) OPEN OR 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.
49
COMMUNICATION
Symptom:
*BUS BIAS LEVEL TOO HIGH
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
→
50
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.
51
COMMUNICATION
*BUS BIAS LEVEL TOO HIGH —
Continued
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