Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Make sure that the battery is fully charged before proceeding.

With the scan tool, read ICS DTCs and record on the repair order.
1. With the scan tool, erase DTCs.
2. Start the engine.
3. Allow the engine to idle for two minutes.
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 ICS DTCs.
  Is the same DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE PCM FOR DTCS
1. Turn the ignition on.
2. With the scan tool, read Powertrain Control Module (PCM) DTCs.
  Are there any Charging System or Battery DTCs set in the PCM?
  
  Yes
  - Perform the appropriate PCM DTC diagnostic procedure. Refer to DTC INDEX .
  No
  - Go To 3
CHECK THE (A937) FUSED BATTERY (+) CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the ICS C1 harness connector.
3. Start the engine.
4. Measure the voltage between ground and the (A937) Fused Ignition circuit at the ICS C1 harness connector and compare it to the voltage at the vehicle battery. Monitor the voltage for more than 15 seconds.
  Is the circuit voltage the same as the voltage measured at the battery for the circuit?
  
  Yes
  - Go To 4
  No
  - Repair the (A937) Fused B (+) circuit for the cause of the high voltage condition.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all ICS 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.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Connect all ICS 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. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read ICS DTCs.
  Is the same DTC active?
  
  Yes
  - Replace the Integrated Center Stack (ICS) in accordance with the Service Information. Refer to MODULE, INTEGRATED CENTER STACK (ICSM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repairing the wiring harness or connections corrected the problem.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .