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 RELATED LAMPS AND COMPONENTS FOR PROPER OPERATION
1. Turn the ignition off.
2. Disconnect the following harness connectors:
  - Cigar Lighter harness connector
  - Decklid Release Switch harness connector
  - Dome Lamp harness connector
  - Drive Mode Select Switch harness connector
  - Driver Door Module C1 and C2 harness connectors
  - Driver Interior Door Handle Switch harness connector
  - Electronic Overhead Module harness connector
  - Electronic Parking Brake Module harness connector
  - Left Rear Interior Door Handle Switch harness connector
  - Left Rear Power Window Switch harness connector
  - Passenger Door Module harness connector
  - Passenger Interior Door Handle Switch harness connector
  - Right Rear Interior Door Handle Switch harness connector
  - Right Rear Power Window Switch harness connector
  - Rear USB Charging Port harness connector
3. Turn the ignition on.
4. Turn the Ambient Lamps on.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
5. Using a 12-volt test light, connected to ground, check the (E3) Panel Lamps Dimmer Switch MUX circuit at each of the following lamp and component harness connectors:
  - Cigar Lighter harness connector
  - Decklid Release Switch harness connector
  - Dome Lamp harness connector
  - Drive Mode Select Switch harness connector
  - Driver Door Module C1 and C2 harness connectors
  - Driver Interior Door Handle Switch harness connector
  - Electronic Overhead Module harness connector
  - Electronic Parking Brake Module harness connector
  - Left Rear Interior Door Handle Switch harness connector
  - Left Rear Power Window Switch harness connector
  - Passenger Door Module harness connector
  - Passenger Interior Door Handle Switch harness connector
  - Right Rear Interior Door Handle Switch harness connector
  - Right Rear Power Window Switch harness connector
  - Rear USB Charging Port harness connector
  Does the test light illuminate brightly for all connections?
  
  Yes
  - Replace the inoperative lamp or component in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (E3) PANEL LAMPS DIMMER SWITCH MUX CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM C6/F harness connector.
3. Measure the resistance of the (E3) Panel Lamps Dimmer Switch MUX circuit between BCM C6/F harness connector - terminal 55 and each of the following:
  - Cigar Lighter harness connector
  - Decklid Release Switch harness connector
  - Dome Lamp harness connector
  - Drive Mode Select Switch harness connector
  - Driver Door Module C1 and C2 harness connectors
  - Driver Interior Door Handle Switch harness connector
  - Electronic Overhead Module harness connector
  - Electronic Parking Brake Module harness connector
  - Left Rear Interior Door Handle Switch harness connector
  - Left Rear Power Window Switch harness connector
  - Passenger Door Module harness connector
  - Passenger Interior Door Handle Switch harness connector
  - Right Rear Interior Door Handle Switch harness connector
  - Right Rear Power Window Switch harness connector
  - Rear USB Charging Port harness connector
  Is the resistance above 3.0 Ohms for any of the connections?
  
  Yes
  - Repair the open on the (E3) Panel Lamps Dimmer Switch MUX circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
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. Reconnect all BCM 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 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.