Page 218 of 4284
Symptom:
ALL OUTPUTS SHORTED
When Monitored and Set Condition:
ALL OUTPUTS SHORTED
When Monitored: Ignition in RUN and IOD fuse installed.
Set Condition: The radio has sensed a short on the output for more than 10 seconds.
POSSIBLE CAUSES
DETERMINE FAULT
FRONT SHORTED SPEAKER
REAR SHORTED SPEAKER
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER
SPEAKER SECTION OF RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Turn the Radio on.
With the DRBIIIt, erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read the audio DTC's.
Does the DRBIIItdisplay ALL OUTPUTS SHORTED?All
Ye s®Go To 2
No®Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short.
Perform BODY VERIFICATION TEST - VER 1.
189
AUDIO
Page 230 of 4284

Symptom:
FRONT OUTPUT SHORT
When Monitored and Set Condition:
FRONT OUTPUT SHORT
When Monitored: Ignition in RUN and IOD fuse installed.
Set Condition: The radio has sensed a short on the front output for more than 10 seconds.
POSSIBLE CAUSES
DETERMINE FAULT
LEFT I/P SPEAKER
LEFT FRONT DOOR SPEAKER
RIGHT I/P SPEAKER
RIGHT FRONT DOOR SPEAKER
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER
SPEAKER SECTION OF RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Turn the Radio on.
With the DRBIIIt, erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read the audio DTC's.
Does the DRBIIItdisplay FRONT OUTPUT SHORT?All
Ye s®Go To 2
No®Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Left I/P Speaker harness connector.
Turn the ignition on.
Turn the radio on.
With the DRBIIIt, erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay FRONT OUTPUT SHORT?All
Ye s®Go To 3
No®Replace the Left I/P Speaker.
Perform BODY VERIFICATION TEST - VER 1.
201
AUDIO
Page 233 of 4284

Symptom:
LEFT OUTPUT SHORT
When Monitored and Set Condition:
LEFT OUTPUT SHORT
When Monitored: Ignition in RUN and IOD fuse installed.
Set Condition: The radio has sensed a short on the left output for more than 10 seconds.
POSSIBLE CAUSES
DETERMINE FAULT
LEFT I/P SPEAKER
LEFT FRONT DOOR SPEAKER
LEFT REAR PILLAR SPEAKER
LEFT REAR SPEAKER
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER
SPEAKER SECTION OF RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Turn the Radio on.
With the DRBIIIt, erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read the audio DTC's.
Does the DRBIIItdisplay LEFT OUTPUT SHORT?All
Ye s®Go To 2
No®Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Left I/P Speaker harness connector.
Turn the ignition on.
Turn the radio on.
With the DRBIIIt, erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay LEFT OUTPUT SHORT?All
Ye s®Go To 3
No®Replace the Left I/P Speaker.
Perform BODY VERIFICATION TEST - VER 1.
204
AUDIO
Page 236 of 4284

Symptom List:
NBS OUTPUT 1 OPEN
NBS OUTPUT 2 OPEN
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be NBS OUTPUT 1 OPEN.
When Monitored and Set Condition:
NBS OUTPUT 1 OPEN
When Monitored: Continuously.
Set Condition: If the FCM detects no voltage present on the NBS relay control circuit.
NBS OUTPUT 2 OPEN
When Monitored: Continuously.
Set Condition: If the FCM detects no voltage present on the NBS relay control circuit.
POSSIBLE CAUSES
CHECK DTCS
FUSED B+ CIRCUIT OPEN
NBS RELAY OPEN
NBS RELAY CONTROL CIRCUIT OPEN
FRONT CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: If neither DTC will reset or is active, refer to the wiring diagrams
located in the service information to help isolate a possible intermittent
condition.
With the DRB, read the FCM DTC's.
Are both the NBS Output 1 Open and the NBS Output 2 Open DTC's set?All
Ye s®Go To 2
No®Replace the Front Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
2 Remove the NBS Relay from the IPM.
Using a 12-volt test light connected to ground, probe cavity 86 of the NBS Relay
connector.
Is the test light illuminated?All
Ye s®Go To 3
No®Check IPM Fuse #14 for an open. If OK, replace the Intelligent
Power Module (IPM).
Perform BODY VERIFICATION TEST - VER 1.
207
AUDIO
Page 243 of 4284

Symptom:
REAR OUTPUT SHORT
When Monitored and Set Condition:
REAR OUTPUT SHORT
When Monitored: Ignition in RUN and IOD fuse installed.
Set Condition: The radio has sensed a short on the rear output for more than 10 seconds.
POSSIBLE CAUSES
DETERMINE FAULT
LEFT REAR PILLAR SPEAKER
LEFT REAR SPEAKER
RIGHT REAR PILLAR SPEAKER
RIGHT REAR SPEAKER
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER
SPEAKER SECTION OF RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Turn the Radio on.
With the DRBIIIt, erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read the audio DTC's.
Does the DRBIIItdisplay REAR OUTPUT SHORT?All
Ye s®Go To 2
No®Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short.
Perform BODY VERIFICATION TEST - VER 1.
2NOTE: If vehicle is not equipped with this speaker, answer Yes to the
question.
Turn the ignition off.
Disconnect the Left Rear Pillar Speaker harness connector.
Turn the ignition on.
Turn the radio on.
With the DRBIIIt, erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay REAR OUTPUT SHORT?All
Ye s®Go To 3
No®Replace the Left Rear Pillar Speaker.
Perform BODY VERIFICATION TEST - VER 1.
214
AUDIO
Page 251 of 4284

Symptom:
RIGHT OUTPUT SHORT
When Monitored and Set Condition:
RIGHT OUTPUT SHORT
When Monitored: Ignition in RUN and IOD fuse installed.
Set Condition: The radio has sensed a short on the right output for more than 10 seconds.
POSSIBLE CAUSES
DETERMINE FAULT
RIGHT I/P SPEAKER
RIGHT FRONT DOOR SPEAKER
RIGHT REAR PILLAR SPEAKER
RIGHT REAR SPEAKER
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER
SPEAKER SECTION OF RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Turn the Radio on.
With the DRBIIIt, erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read the audio DTC's.
Does the DRBIIItdisplay RIGHT OUTPUT SHORT?All
Ye s®Go To 2
No®Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Right I/P Speaker harness connector.
Turn the ignition on.
Turn the radio on.
With the DRBIIIt, erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay RIGHT OUTPUT SHORT?All
Ye s®Go To 3
No®Replace the Right I/P Speaker.
Perform BODY VERIFICATION TEST - VER 1.
222
AUDIO
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
Page 402 of 4284

Symptom:
*BUS +/- SIGNALS OPEN FROM AUTOMATIC TEMPERATURE
CONTROL MODULE
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE BCM
GROUND CIRCUIT OPEN
FUSED (B+) CKT OPEN
IGNITION SWITCH CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AUTOMATIC TEMPERATURE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?All
Ye s®Go To 2
No®Refer to the symptom list for problems related to no communica-
tion with the BCM.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the ATC C2 harness connector.
Measure the resistance between ground and the ground circuit.
Is the resistance below 5.0 ohms?All
Ye s®Go To 3
No®Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the ATC C2 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit.
Is the test light illuminated?All
Ye s®Go To 4
No®Repair the Fused B+ circuit for an open or short. Refer to the
wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Disconnect the ATC C2 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Ignition Switch circuit.
Is the test light illuminated?All
Ye s®Go To 5
No®Repair the Ignition Switch circuit for an open or short. Refer to
the wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
373
COMMUNICATION