GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Body and Accessories 🢒 Keyless Entry 🢒 Diagnostic System Check - Lighting Systems

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 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.

    2.

  2. Determine if Body Control Module DTCs which may affect Lighting System operation are present.

    3.

  3. 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.

Step

Action

Yes

No

1

Install a scan tool.

Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not Power Up in Data Link Communications

2

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the following systems:
    3. 2.1. The body control module
    2.2. The powertrain control module

Does the scan tool communicate with these systems?

Go to Step 3

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

3

  1. Select the body control module display DTCs function on the scan tool.
  2. Select the powertrain control module display DTCs function on the scan tool.

Does the scan tool display any DTCs?

Go to Step 4

Go to Symptoms - Lighting Systems

4

Does the scan tool display any DTCs which begin with a "U"?

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

Go to Step 5

5

Does the scan tool display DTC B0605?

Go to Diagnostic Starting Point - Body Control System in Body Control Systems

Go to Step 6

6

Does the scan tool display DTC P0562 or P0563?

Go to Diagnostic System Check - Engine Controls in Engine Controls- 5.7 (LS1)

Go to Diagnostic Trouble Code (DTC) List