Diagnostic System Check

DIAGNOSTIC AIDS
You must diagnose the diagnostic trouble codes (DTCs) in the order specified in the DTC list. Failure to do so may result in the following conditions:
^ Extended diagnostic time
^ Incorrect diagnosis
^ Incorrect parts replacement

If the passlock module, the Passlock(TM) sensor, or the PCM have been replaced, perform the learn procedure before following the diagnostic system check.

Refer to the instrument panel for additional information on the message center display. Vehicles equipped with a content theft deterrent system use the message center in order to provide an indication similar to that of the vehicle theft deterrent system. Carefully follow the steps within the Theft Deterrent Diagnostic System Check.

TEST DESCRIPTION

Steps 1-5:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.