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 STANDARD PROCEDURE STANDARD PROCEDURE .
CHECK THE SPEED CONTROL SWITCH FOR AN INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Speed Control Switch harness connector.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
6. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Replace the Speed Control Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE STEERING COLUMN CONTROL MODULE (SCCM) FOR AN INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the SCCM C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
6. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Inspect for a shorted circuit in the wiring harness between the Speed Control Switch and SCCM. If no problems are found, 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 .
CHECK THE (D504) LIN BUS LIN BUS LIGHTING SIG RT CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the BCM C8/H harness connector.
3. Check for continuity between ground and the (D504) LIN Bus LIN Bus Lighting Sig Rt circuit at BCM C8/H harness connector - terminal 32.
  Is there continuity between ground and the (D504) LIN Bus LIN Bus Lighting Sig Rt circuit?
  
  Yes
  - Repair the short to ground in the (D504) LIN Bus LIN Bus Lighting Sig Rt circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE (D504) LIN BUS LIGHTING SIG RT CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT IN THE HARNESS CONNECTOR
NOTE:
The ignition may not turn on when the BCM harness connector containing the circuit being tested is disconnected. Therefore, this step can help determine if the circuit being tested is shorted to another voltage circuit in any of the related harness connectors.
1. Check for continuity between the (D504) LIN Bus LIN Bus Lighting Sig Rt circuit and all other circuits on the SCCM C1 harness connector.
2. Check for continuity between the (D504) LIN Bus LIN Bus Lighting Sig Rt circuit and all other circuits on the BCM C8/H harness connector.
  Is there continuity between the (D504) LIN Bus Lighting Sig Rt circuit and any other circuit(s)?
  
  Yes
  - Repair the short between the (D504) LIN Bus Lighting Sig Rt circuit and the circuit that has continuity.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST STANDARD PROCEDURE .
  No
  - Inspect the (D504) LIN Bus Lighting Sig Rt circuit for a short to voltage, between the Speed Control Switch harness connector and the BCM C8/H harness connector. Repair, if needed. If no problems are found, Go To 6
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all BCM 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. Connect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect 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 Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), 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.