GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Body and Accessories 🢒 Cellular Communication 🢒 Diagnostic System Check - Theft Deterrent

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. The symptoms list in Symptoms will determine the correct diagnostic procedure.

    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.

    4.

  4. The presence of DTCs B1000, B1004, B1007, or B1009 indicates an internal module fault.

    5.

  5. The presence of DTCs B1327 or B1328 indicates a high or low voltage condition.

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

2

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the following modules:
    3. • Dash Integration Module (DIM)
    • Driver Door Module (DDM)
    • LH Middle Door Module (w/V4U)
    • LH Rear Door Module
    • Passenger Front Door Module (PDM)
    • Powertrain Control Module (PCM)
    • RH Middle Door Module (w/V4U)
    • RH Rear Door Module
    • Rear Integration Module (RIM)
    • Remote Function Actuator Module (RFA)
    • Theft Deterrent Module

Does the scan tool communicate with the all the listed modules?

Go to Step 3

Go to Scan Tool Does Not Communicate with Class 2 Device

3

Select the display DTCs function on the scan tool for the following modules:

    • Dash Integration Module (DIM)
    • Driver Door Module (DDM)
    • LH Middle Door Module (w/V4U)
    • LH Rear Door Module
    • Passenger Front Door Module (PDM)
    • Powertrain Control Module (PCM)
    • RH Middle Door Module (w/V4U)
    • RH Rear Door Module
    • Rear Integration Module (RIM)
    • Remote Function Actuator Module (RFA)
    • Theft Deterrent Module

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

Go to Step 5

5

Does the scan tool display DTC B1000, B1004, B1007, or B1009?

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 6

6

Does the scan tool display DTC B1327 or B1328?

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Diagnostic Trouble Code (DTC) List/Type