GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Diagnostic System Check

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. This test determines if communication can be established with the following modules.

    3. • Electronic brake control module (EBCM)
    • Instrument cluster
    • Rear integration module (RIM)

  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.

    4.

  4. The presence of DTCs B1000, B1004, B1007, or B1009 indicate an internal module malfunction.

    5.

  5. The presence of DTCs B1327, B1328, B1513, or B1514 indicate a system voltage fault.

    6.

  6. The presence of DTCs which begin with a "C" indicate an antilock brakes system fault.

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 modules:
    3. • Electronic brake control module (EBCM)
    • Instrument cluster
    • Rear integration module (RIM)

Does the scan tool communicate with the indicated modules?

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 following modules:

    • Electronic brake control module (EBCM)
    • Instrument cluster
    • Rear integration module (RIM)

Does the scan tool display any DTCs?

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 DTCs B1000, B1004, B1007, or B1009?

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

Go to Step 6

6

Does the scan tool display DTCs B1327, B1328, B1513, or B1514?

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

Go to Step 7

7

Does the scan tool display any EBCM DTCs that begin with a "C"?

Go to Diagnostic Trouble Code (DTC) List/Type in Antilock Brake System

Go to Symptoms