Diagnostic Test

1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.

   Is the DTC active or pending?

   Yes 

   • Go To  2

   No 

   • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .

1. Refer to the recorded DTCs.

   Are there any Communication DTCs active or pending?

   Yes 

   • Perform the applicable diagnostic procedure(s). Refer to 3.2L - DIAGNOSTIC CODE INDEX .

   No 

   • Go To  3

Are there any CAN IHS Bus or CAN C Bus DTCs set in the Body Control Module?

Yes 

• Diagnose the appropriate DTC in the Body Control Module before continuing. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .

No 

• Go To  4

1. Turn the ignition off.
2. Disconnect the ICS Switch Bank Module harness connector.
3. Disconnect the BCM C4 harness connector.
4. Measure the resistance of the CAN IHS Bus (+) circuit between the ICS Switch Bank Module and the BCM C4 harness connector.

   Is resistance below 3.0 Ohms?

   Yes 

   • Go To  5

   No 

   • Repair the CAN IHS Bus (+) circuit for an open or high resistance.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .

1. Measure the resistance of the CAN IHS Bus (-) circuit between the ICS Switch Bank Module and the BCM C4 harness connector.

   Is resistance below 3.0 Ohms?

   Yes 

   • Replace the Switch Bank in accordance with the Service Information.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .

   No 

   • Repair the CAN IHS Bus (-) circuit for an open or high resistance.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .