Jeep XJ. Manual — part 549
TEST
ACTION
APPLICABILITY
3
Ensure the ignition key is off while disconnecting the following Modules.
Disconnect the following Components from the CCD Bus 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 message for a change after each Module is disconnected which
will identify that module/circuits as being the cause of the Bus Failure Message.
Disconnect the TCM harness connector if equipped.
Disconnect the Overhead Console harness connector if equipped.
Remove the Instrument Cluster from the Instrument Panel.
Disconnect the RKE Module harness connector if equipped.
Disconnect the SKIM harness connector if equipped.
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 Bus message change after disconnecting any one module/component?
All
Yes
→
No
→
4
Turn the ignition off.
Disconnect the harness connectors on the module that when disconnected the bus
failure message was eliminated.
Measure the resistance between the CCD Bus (+) circuit and each 5 volt circuit in the
harness connector.
Measure the resistance between the CCD Bus (-) circuit and each 5 volt circuit in the
harness connector.
Is the resistance below 100.0 ohms on any of the measurements?
All
Yes
→
Repair the CCD Bus circuit for a short to a 5 volt circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Replace the module/component that caused the bus failure mes-
sage.
Perform BODY VERIFICATION TEST - VER 1.
5
All modules must be disconnected from the CCD Bus circuit at this time.
Turn the ignition on.
Measure the CCD Bus (+) circuit and the CCD Bus (-) circuit at the Data Link
connector for voltage.
Is the voltage above 4.0 volts on either Bus circuit?
All
Yes
→
Repair the CCD Bus (+) or the CCD Bus (-) circuit for a short to
voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→
6
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.
76
COMMUNICATION
*SHORT TO 5 VOLTS FAILURE —
Continued
Symptom:
*SHORT TO BATTERY FAILURE
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE OPEN GROUND CIRCUITS
POWERTRAIN CONTROL MODULE - INTERNAL SHORT TO BATTERY
AIRBAG CONTROL MODULE
INSTRUMENT CLUSTER GROUND CIRCUIT OPEN
INSTRUMENT CLUSTER - INTERNAL SHORT TO BATTERY
SENTRY KEY IMMOBILIZER MODULE (IF EQUIPPED)
SENTRY KEY IMMOBILIZER MODULE GROUND CIRCUIT OPEN
SENTRY KEY IMMOBILIZER MODULE - INTERNAL SHORT TO BATTERY
REMOTE KEYLESS ENTRY MODULE GROUND CIRCUIT OPEN
REMOTE KEYLESS ENTRY MODULE - INTERNAL SHORT TO BATTERY
OVERHEAD CONSOLE GROUND CIRCUIT OPEN
OVERHEAD CONSOLE - INTERNAL SHORT TO BATTERY
TRANSMISSION CONTROL MODULE (IF EQUIPPED)
CCD BUS (+) OR BUS (-) CIRCUIT SHORTED TO BATTERY
DRB OR DRB CABLE
TEST
ACTION
APPLICABILITY
1
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: SHORT TO BATTERY?
All
Yes
→
No
→
2
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: SHORT TO BATTERY?
All
Yes
→
No
→
Replace the Airbag Control Module.
Perform BODY VERIFICATION TEST - VER 1.
77
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO BATTERY?
All
Yes
→
No
→
4
NOTE: Answer Yes to the question if the vehicle is not equipped with this
module.
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: SHORT TO BATTERY?
All
Yes
→
No
→
5
NOTE: Answer Yes to the question if the vehicle is not equipped with this
module.
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: SHORT TO BATTERY?
All
Yes
→
No
→
6
NOTE: Answer Yes to the question if the vehicle is not equipped with this
module.
Turn the ignition off.
Disconnect the Overhead Console harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO BATTERY?
All
Yes
→
No
→
7
NOTE: Answer Yes to the question if the vehicle is not equipped with this
module.
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: SHORT TO BATTERY?
All
Yes
→
No
→
Replace the Transmission Control Module.
Perform BODY VERIFICATION TEST - VER 1.
78
COMMUNICATION
*SHORT TO BATTERY FAILURE —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the ACM harness connector.
Disconnect the Instrument Cluster C2 harness connector.
Disconnect the SKIM harness connector (If equipped).
Disconnect the RKE Module harness connector (If equipped).
Disconnect the Overhead Console harness connector (If equipped).
Disconnect the TCM harness connector (If equipped).
Turn the ignition on.
Measure the voltage of the CCD Bus (+) and the CCD Bus (-) circuits at the DLC.
Is the voltage above 0.5 volts?
All
Yes
→
Repair the CCD Bus (+) or CCD Bus (-) circuit for a short to
battery.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair/replace the DRB or DRB cable as necessary.
Perform BODY VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Disconnect the Overhead Console harness connector.
Turn all lights off.
Measure the resistance between ground and the Ground circuit (cavity 12).
Is the resistance below 5.0 ohms?
All
Yes
→
Replace the Compass Mini Trip Computer (Overhead Console).
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the RKE module harness connector.
Turn all lights off.
Measure the resistance between ground and the Ground circuit in the RKE Module
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace the Remote Keyless Entry Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
11
Turn the ignition off.
Disconnect the SKIM harness connector.
Turn all lights off.
Measure the resistance between ground and both Ground circuits in the SKIM
connector.
Is the resistance below 5.0 ohms for each measurement?
All
Yes
→
Replace the Sentry Key Immobilizer Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
79
COMMUNICATION
*SHORT TO BATTERY FAILURE —
Continued
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