Diagnostic Test

1) 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 step 2).
No
1. Refer to *STORED LOST COMMUNICATION DTCS .
2) 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 affected DTC.
No
1. Go to step 3).
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 step 4).
No
1. Perform the *NO RESPONSE FROM WCM (SENTRY KEY REMOTE ENTRY MODULE) .
4) 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.