Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC must be active and the appropriate trailer must be used for the results of this test to be valid.
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read Trailer Tow Module (TTM) DTCs and record on the repair order.
4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
5. With the scan tool, erase TTM DTCs.
6. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read TTM DTCs.
  Is the DTC active?
  
  Yes
  - Go To
  No
  - Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the TTM harness connector.
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 the TTM harness connector. Be certain that the harness connector is fully seated and the connector lock is 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 TTM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Trailer Tow Module (TTM) in accordance with the Service Information.
  - Perform the TTM VERIFICATION TEST. Refer to STANDARD-PROCEDURE-TTM-VERIFICATION-TEST .
  No
  - Perform the TTM VERIFICATION TEST. Refer to STANDARD-PROCEDURE-TTM-VERIFICATION-TEST .
  - Test complete.