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
→
Go To
2
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
→
Go To
3
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