GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Body and Accessories 🢒 Retained Accessory Power 🢒 Diagnostic System Check - Retained Accessory Power

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. The specified procedure will determine the particular condition. Attempt to communicate with the following modules:

    2. • Cellular Telephone Module
    • Dash Integration Module (DIM)
    • LH Front Door Module
    • LH Front Power Window Switch
    • LH Rear Door Module
    • Memory Seat Module (MSM)
    • Navigation Data Processor
    • Navigation Display Module
    • Radio (w/UY4)
    • Radio (w/oUY4)
    • Radio Amplifier (w/U57)
    • Radio Amplifier (w/oU57)
    • Rear Integration Module (RIM)
    • RH Front Door Module
    • RH Rear Door Module
    • Steering Column Module

  2. The Symptom Table will determine the correct diagnostic procedure to use.

    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. If DTC B1422 is set, the RAP feature may be disable.

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 each module on the Class 2 serial data circuit listed in the supporting text. (If using a Tech 2, obtain this information using the Class 2 Message Monitor feature.)

Does the scan tool communicate with these 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 for each module. (If using a Tech 2, use the Class 2 DTC Check feature in order to determine which modules have DTCs set.)

Does the scan tool display any DTCs?

Go to Step 4

Go to Symptoms

4

Select the modules' display DTC function on the scan tool.

Does the scan tool display DTCs that 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/Type in Body Control Systems

Go to Step 6

6

Does the scan tool display DTC B1327 or B1328?

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

Go to Step 7

7

Does the scan tool display DTC B1422?

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

Go to Symptoms