Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Check for available ACC Module software updates. If applicable, update the module software, then retest.
1. With the scan tool, read Adaptive Cruise Control (ACC) DTCs and record on the repair order.
2. With the scan tool, erase ACC Module DTCs.
3. Turn the ignition off for ten seconds, then start the engine.
4. With the scan tool, read ACC DTCs.
  Did the DTC return?
  
  Yes
  - Replace the ACC Module in accordance with the Service Information.
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL VERIFICATION TEST .
  No
  - Go To 2
CHECK RELATED WIRING AND HARNESS CONNECTIONS
1. Turn the ignition off.
2. Check the related component and module power supply and ground circuits.
3. Disconnect the ACC Module harness connector(s).
4. Disconnect all related in-line harness connections (if equipped).
5. Disconnect the related component harness connectors.
6. 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.
7. Reconnect all harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
10. With the scan tool, erase DTCs.
11. Using the recorded information along with the When Monitored and Set Conditions above, operate the vehicle within the conditions that set the DTC.
12. With the scan tool, read ACC DTCs.
  Did the DTC return?
  
  Yes
  - Replace the ACC Module in accordance with the Service Information.
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL VERIFICATION TEST .
  No
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL VERIFICATION TEST .
  - Test complete.