Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read Active Noise Cancellation (ANC) Module DTCs and record on the repair order.
3. With the scan tool, erase DTCs.
4. Turn the Radio on.
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 DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCs
NOTE:
Make sure the battery is fully charged before proceeding.
1. With the scan tool, read PCM DTCs and record on the repair order.
  Are there any battery or charging system DTCs present?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
CHECK FOR AN ACTIVE DTC
1. With the scan tool, record and erase the ANC Module DTCs.
2. Start the engine.
3. Allow the engine to idle for two minutes.
4. With the scan tool, read the ANC Module DTCs.
  Is the DTC active?
  
  Yes
  - Go To 4
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (A931) FUSED B(+) CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
NOTE:
Check the fuse for an open. If the fuse is open, make sure to check for a short to ground prior to replacing the fuse.
1. Turn the ignition off.
2. Disconnect the ANC Module C2 harness connector.
3. Turn the ignition on.
4. With a 12-volt test light connected to ground, check the (A931) Fused B(+) circuit at the ANC Module C2 harness connector.
5. The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (A931) Fused B(+) circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z912) GROUND CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. With a 12-volt test light connected to 12 volts, check the (Z912) Ground circuit in the ANC Module C2 harness connector.
2. The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the (Z912) Ground circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all ANC Module 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 ANC Module 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 ANC Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the ANC Module in accordance with the Service information. Refer to MODULE, ACTIVE NOISE CANCELLATION (ANC), 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.