Diagnostic Test

VERIFY THE DTC IS ACTIVE
NOTE:
Diagnose and repair any system voltage or Transfer Case related DTCs in the Drive Train Control Module (DTCM) before continuing with this test.
1. Ignition on, engine not running.
2. With the scan tool, clear Stored DTCs in the DTCM and the CCN.
3. Test drive the vehicle.
4. During the test drive, move the Transfer Case Selector Switch (if equipped) to each position several times in accordance with the Service Information.
5. With the scan tool, read DTCs in the DTCM and the CCN.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 5
AMBIENT TEMPERATURE SENSOR
1. With the scan tool, monitor the ambient temperature in the Body Control Module (BCM).
  Is the ambient temperature at room temperature?
  
  Yes
  - Go To 3
  No
  - Replace the Ambient Temperature Sensor in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
TERRAIN SWITCH BANK MODULE (TSBM) WIRING/HARNESS CONNECTOR
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to this circuit.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
TERRAIN SWITCH BANK MODULE (TSBM)
1. Turn the ignition off to the lock position
2. Replace the Terrain Switch Bank Module (TSBM).
3. Ignition on, engine not running.
4. With the scan tool, clear Stored DTCs in the CCN and the DTCM.
5. Test drive the vehicle.
6. During the test drive, move the Terrain Switch Bank Module (TSBM) to each position several times in accordance with the Service Information.
7. With the scan tool, read DTCs in the CCN and the DTCM.
  Does the DTC remain active?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL, REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
6. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.