Diagnostic System Check - Lighting Systems

A Diagnostic System Check - Lighting Systems:

TEST DESCRIPTION
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. The instrument panel module (IPM) is used on vehicles with automatic climate control (w/CJ2). The climate control panel is (CCP) used with standard climate control systems (w/C67).
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.

For a description of the RPO Code(s) shown in this article refer to the RPO Code List found at Vehicle/Application ID RPO Codes