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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 DeVille 🢒 Suspension 🢒 Automatic Level Control 🢒 Diagnostic System Check - Automatic Level Control

Diagnostic System Check - Automatic Level Control w/o F45

Test Description

The numbers below refer to the step number 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 "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

DEFINITION: This diagnostic procedure only applies to vehicles without Road Sensing Suspension.

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 Rear Integrated Module (RIM).

Does the scan tool communicate with the RIM?

Go to Step 3

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

3

Select the automatic level control display DTC function on the scan tool.

Does the scan tool display any DTCs?

Go to Step 4

Go to Symptoms - Automatic Level Control

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 Communication

Go to Step 5

5

Does the scan tool display DTC 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 Step 7

7

Does the scan tool display any other DTC's for the RIM module?

Go to Diagnostic Trouble Code (DTC) List

Go to Symptoms - Automatic Level Control

Diagnostic System Check - Automatic Level Control w/F45

Test Description

The numbers below refer to the step number 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 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

DEFINITION: This diagnostic procedure only applies to vehicles with Road Sensing Suspension.

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 Electronic Suspension Control (ESC) Module.

Does the scan tool communicate with the ESC Module?

Go to Step 3

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

3

Select the ESC Module display DTCs function on the scan tool.

Does the scan tool display any DTCs?

Go to Step 4

Go to Symptoms - Automatic Level Control

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 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 Step 7

7

Does the scan tool display any other DTC's for the ESC module?

Go to Diagnostic Trouble Code (DTC) List

Go to Symptoms - Automatic Level Control