Test Description

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The numbers below refer to the step numbers in the diagnostic table.

2. Lack of communication may be due to partial or total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
4. The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.
5. Since the VSES interacts extensively with powertrain control systems, powertrain related DTCs should be diagnosed and repaired prior to diagnosing any VSES concerns.
6. The presence of this DTC, which the scan tool may display in Powertrain, may cause the EBCM to set DTC C0283.
7. The presence of this DTC, which may be set by the body control module (BCM), may cause the EBCM to set DTC C0455.

Fig 1: Diagnostic System Check - ABS (W/JL4) (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Diagnostic System Check - ABS (W/JL4) (2 Of 2)

Courtesy of GENERAL MOTORS CORP.