Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR ADDITIONAL BCM DTCS
1. With the scan tool, read BCM DTCs.
  Is DTC: U1802-08-LIN 2-BUS SIGNAL/MESSAGE FAILURE also Active?
  
  Yes
  - Repair DTC: U1802-08-LIN 2-BUS SIGNAL/MESSAGE FAILURE before proceeding with this diagnostic procedure.
  No
  - Go To 3
CHECK THE VOLTAGE ON THE (A92) FUSED B(+) CIRCUIT
1. Turn the ignition off.
2. Disconnect the Right Steering Wheel Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (A92) Fused B(+) circuit at the Right Steering Wheel Switch harness connector.
  Is the voltage above 9.0 volts?
  
  Yes
  - Go To 4
  No
  - Repair the open or short to ground in the (A92) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z908) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z908) Ground circuit at the Right Steering Wheel Switch harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (Z908) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE VOLTAGE ON THE (D594) LIN BUS CIRCUIT
1. Turn the ignition on.
2. Measure the voltage on the (D594) LIN Bus circuit at the Right Steering Wheel Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Replace the Right Steering Wheel Switch in accordance with the Service Information. Refer to SWITCH, RADIO, REMOVAL AND INSTALLATION SWITCH, REMOTE RADIO, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (D594) LIN BUS CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Steering Column Control Module (SCCM) C4 harness connector.
3. Measure the resistance of the (D594) LIN Bus circuit between the Right Steering Wheel Switch harness connector and SCCM C4 harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (D594) LIN Bus circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 7
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all SCCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all SCCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.