GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Aztek - FWD 🢒 Accessories 🢒 Navigation Systems 🢒 Diagnostic System Check - Navigation System

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 symptom list in Symptoms will determine the correct diagnostic procedure to use.

    3.

  3. The presence of DTCs which begin with a 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
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine off.

Does the scan tool power up?

Go to Step 2

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

2

Attempt to establish communication with the following modules:

    • The radio
    • The CD changer
    • The dash integration module (DIM)

Does the scan tool communicate with the radio, the CD changer, or the DIM?

Go to Step 3

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

3

Select the display DTC functions on the scan tool for the following modules:

    • The radio
    • The CD changer
    • The dash integration module (DIM)

Does the scan tool display any DTCs?

Go to Step 4

Go to Symptoms - Navigation Systems

4

Does the scan tool display any DTCs which begin with "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, B1004, B1007, or B1009?

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

Go to Step 6

6

Does the scan tool display DTC B1327?

Go to Diagnostic Trouble Code (DTC) List in Engine Electrical

Go to Diagnostic Trouble Code (DTC) List