Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Verify the Stop Lamp Switch is installed correctly on the vehicle before proceeding.
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 DTCS
1. With the scan tool, read DTCs from all modules.
  Does the scan tool display any Stop Lamp Switch related DTCs as active?
  
  Yes
  - Perform the Stop Lamp Switch related diagnostic test(s) before proceeding with this test.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK BRAKE PEDAL SWITCH 1 STATUS
1. With the scan tool, read the Brake Pedal Switch 1 (N.O.) input.
2. Press and release the brake pedal several times.
  Does the scan tool display Brake Pedal Switch 1 (N.O.): OFF and ON for the appropriate pedal position?
  
  Yes
  - Go To 4
  No
  - Go To 5
CHECK BRAKE PEDAL SWITCH 2 STATUS
1. With the scan tool, read the Brake Pedal Switch 2 (N.C.) input.
2. Press and release the brake pedal several times.
  Does the scan tool display Brake Pedal Switch 2 (N.C.): OFF and ON for the appropriate pedal position?
  
  Yes
  - Go To 7
  No
  - Go To 6
CHECK THE BRAKE SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch harness connector.
3. Disconnect the BCM harness connector.
4. Turn the ignition on.
5. Measure the voltage on the Brake Signal 1 circuit at the Stop Lamp Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the Brake Signal 1 circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Stop Lamp Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE BRAKE SIGNAL 2 CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch harness connector.
3. Disconnect the BCM harness connector.
4. Turn the ignition on.
5. Measure the voltage on the Brake Signal 2 circuit at the Stop Lamp Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the Brake Signal 2 circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Stop Lamp Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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.