Page 384 of 4284

TEST ACTION APPLICABILITY
8 Gain access to the Body Control Module C3 connector.
Turn the ignition on.
While back probing, measure the voltage of the Ignition Switch Output circuit.
Is the voltage above 10.0 volts?All
Ye s®Repair the Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 9
9 Turn the ignition off.
Disconnect the Body Control Module C3 connector.
Measure the resistance between ground and the Ignition Switch Output circuit in the
Overhead Console connector.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Ignition Switch Output circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 10
10 A failure in the HVAC, Overhead Console, or the ABS system could cause this DTC
to set. The Fused Ignition Switch Output (ABS) circuit will be diagnosed.
Continue to the ABS circuit for further diagnosis.All
ABS circuit diagnostics.
Go To 11
11 Turn the ignition off.
Disconnect the ABS connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit in the ABS
connector.
Is the voltage above 10.0 volts?All
Ye s®The condition that caused the DTC to set is not present on this
circuit. Further diagnostics are required to determine the cause of
the DTC.
No®Go To 12
12 Gain access to the Body Control Module C3 connector.
Turn the ignition on.
While back probing, measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?All
Ye s®Repair the Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 13
13 Turn the ignition off.
Disconnect the Body Control Module C3 connector.
Measure the resistance between ground and the Fused Ignition Switch Output
circuit in the ABS connector.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Ignition Switch Output circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 14
355
COMMUNICATION
IGNITION RUN OUTPUT SHORT ÐContinued
Page 389 of 4284
Symptom:
MIC MESSAGES NOT RECEIVED
When Monitored and Set Condition:
MIC MESSAGES NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition: The BCM does not receive any messages from the Instrument Cluster
(MIC) for at least 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE MIC
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Instrument Cluster (MIC).
Was the DRB able to I/D or communicate with the Instrument Cluster (MIC)?All
Ye s®Go To 2
No®Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2 With the DRB, erase DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, read DTC's.
Did this DTC reset?All
Ye s®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
360
COMMUNICATION
Page 390 of 4284
Symptom:
MSM MESSAGES NOT RECEIVED
When Monitored and Set Condition:
MSM MESSAGES NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition: The BCM does not receive any messages from the Memory Seat Module
(MSM) for at least 0.125 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE MEMORY SEAT MODULE
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, enter Body then Memory Seat Module.
Was the DRB able to I/D or communicate with the MSM?All
Ye s®Go To 2
No®Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2 With the DRB, erase DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, read DTC's.
Did this DTC reset?All
Ye s®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
361
COMMUNICATION
Page 393 of 4284
Symptom:
ORC MESSAGES NOT RECEIVED
When Monitored and Set Condition:
ORC MESSAGES NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition: The BCM does not receive any messages from the Occupant Restraint
Controller (ORC) for at least 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE OCCUPANT RESTRAINT CONTROLLER
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the ORC.
Was the DRB able to I/D or communicate with the ORC?All
Ye s®Go To 2
No®Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2 With the DRB, erase DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, read DTC's.
Did this DTC reset?All
Ye s®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
364
COMMUNICATION
Page 394 of 4284
Symptom:
OTIS MESSAGES NOT RECEIVED
When Monitored and Set Condition:
OTIS MESSAGES NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition: The BCM does not receive any messages from the overhead console for at
least 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE OTIS
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the overhead console.
Was the DRB able to I/D or communicate with the overhead console?All
Ye s®Go To 2
No®Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2 With the DRB, erase DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, read DTC's.
Did this DTC reset?All
Ye s®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
365
COMMUNICATION
Page 396 of 4284

Symptom:
PCM MESSAGES NOT RECEIVED
When Monitored and Set Condition:
PCM MESSAGES NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition: The BCM does not receive any messages from the PCM for at least 5
seconds.
POSSIBLE CAUSES
PCM MESSAGE NOT RECEIVED
ATTEMPT TO COMMUNICATE WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, enter Instrument Cluster, System Tests then PCM Monitor.
Does the DRB display: PCM is active on BUS?All
Ye s®Erase the DTC, if DTC resets, replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 2
2 Turn the ignition on.
With the DRB, attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?All
Ye s®Go To 3
No®Refer to the communication category and perform the appropriate
symptom.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the PCM C2 harness connector.
Connect the diagnostic junction port tester #8339 to the diagnostic junction port.
Note: Do not connect the tester to the DRB.
Measure the resistance of the PCI Bus circuit between the diagnostic junction port
tester and the PCM C2 connector.
Is the resistance below 5.0 ohms?All
Ye s®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No®Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
367
COMMUNICATION
Page 397 of 4284

Symptom:
RADIO MEM MSG NOT RECEIVED
When Monitored and Set Condition:
RADIO MEM MSG NOT RECEIVED
When Monitored: With the ignition in run, and the IOD fuse installed.
Set Condition:
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE RADIO
CHECK THE MEMORY SYSTEM
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Radio.
Was the DRB able to I/D or communicate with the Radio?All
Ye s®Go To 2
No®Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition on.
Operate the memory seat system.
Did the memory seat system operate properly?All
Ye s®Go To 3
No®Refer to the Memory Seat category and perform the appropriate
symptom.
Perform BODY VERIFICATION TEST - VER 1.
3 With the DRB, erase DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, read DTC's.
Did this DTC reset?All
Ye s®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
368
COMMUNICATION
Page 399 of 4284

Symptom:
RUN/START HARDWIRE INPUT FAILURE
When Monitored and Set Condition:
RUN/START HARDWIRE INPUT FAILURE
When Monitored: With the ignition on and battery voltage greater than 10.4 volts.
Set Condition: The Fused Ignition Switch Output circuit voltage at the BCM goes below
0.5 volts and the BCM detects a voltage mismatch between the two ignition switch inputs.
POSSIBLE CAUSES
TEST FOR CURRENT DTC'S
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
IGNITION SWITCH
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC's.
Cycle the ignition from ON to OFF.
Start the vehicle and observe the DRBIIIt.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay RUN/START HARDWIRE INPUT FAILURE?All
Ye s®Go To 2
No®The condition that caused this DTC is currently not present. Use
the wiring diagram/schematic as a guide, and inspect the related
wiring harness for a possible intermittent condition.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Gain access to the Ignition Switch connector.
Turn the ignition on.
While back probing, measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?All
Ye s®Go To 3
No®Replace the Ignition Switch.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Gain access to the Body Control Module C2 connector.
While back probing, measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?All
Ye s®Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
370
COMMUNICATION