Diagnostic Test

VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

With the scan tool, read active DTC's.

Is this DTC active?

Yes
1. Go To 2.
No
1. Perform the *STORED LOST COMMUNICATION DTCS test procedure.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTC'S
With the scan tool, read active DTC's from all modules.

NOTE: Check for CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTC's.

Does the scan tool display any active DTC's to the conditions listed above?

Yes
1. Diagnose and repair the DTC. Refer to the DIAGNOSTIC CODE INDEX for a complete list of the symptoms.
No
1. Go To 3.
VERIFY THAT THE WCM IS ACTIVE ON THE BUS
Turn the ignition on.

With the scan tool, select ECU View.

Verify that the WCM is active on the bus.

Is the WCM active on the bus?

Yes
1. Go To 4.
No
1. Perform the appropriate NO RESPONSE diagnostic procedure. See DIAGNOSIS AND TESTING .
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC'S
With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTC's "Logged Against" the WCM?

Yes
1. Replace/update the Sentry Key Remote Entry Module in accordance with the service information.
2. Perform SKREEM/SKIM VERIFICATION TEST .
No
1. Replace/update the module that set this DTC in accordance with the service information.
2. Perform the appropriate VERIFICATION TEST.