GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Monte Carlo 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 Diagnostic System Check - Theft Deterrent

Diagnostic Aids

Use J 35616 when probing or testing electrical connector terminals. Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the step numbers 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. 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 body control module (BCM), instrument panel cluster (IPC), and the powertrain control module (PCM).

Does the scan tool communicate with the modules listed?

Go to Step 3

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

3

Select the BCM, IPC and PCM display DTCs function on the scan tool.

Does the scan tool display any DTCs for the modules listed?

Go to Step 4

Go to Symptoms

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 B1000 or B1004?

Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System

Go to Diagnostic Trouble Code (DTC) List/Type