Diagnostic System Check - Instrument Cluster. Chevrolet PJJ 2001

For 1990-2009 cars

### 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. The symptom list will determine the correct diagnostic procedure to use when no DTCs are present.

3. The presence of DTCs which begin with "U" indicate that some other module is not communicating.

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 instrument panel cluster.

Does the scan tool communicate with the instrument panel cluster?

Go to Step 3

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

3 | Select the display DTCs function on the scan tool for the instrument panel cluster. Does the scan tool display any DTCs for the instrument panel cluster? | Go to Step 4 | Go to Symptoms - Instrument Cluster
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 B1001? | Go to Diagnostic Trouble Code (DTC) List/Type | Go to Symptoms - Instrument Cluster