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 TIPM configuration, 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 ITM IS ACTIVE ON THE BUS
Turn the ignition on.

With the scan tool, select ECU View.

Verify that the ITM is active on the bus.

Is the ITM active on the bus?

Yes
1. Go to step 4).
No
1. Perform the *NO RESPONSE FROM ITM (INTRUSION TRANSCEIVER 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 ITM?

Yes
1. Replace/update the Intrusion Transceiver Control Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace/update the module that set the DTC in accordance with the service information
2. Perform the appropriate VERIFICATION TEST.