GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Cutlass 🢒 Brakes 🢒 Antilock Brake System 🢒 Data Link Communications System Check

Test Description

  1. This step is to determine if communications between the scan tool and the vehicles components are good.

    2.

  2. This step is to check the Class 2 communications system for connections and any DTC's that may be set.

    3.

  3. This step is to determine if the scan tool can communicate with the UART Data Line, specifically within the Supplemental Inflatable Restraint System.

    4.

  4. This step determines if the Serial Data communication between the EBCM and the scan tool can be accomplished.

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

With scan tool connected, make contact with any of the modules applicable to the vehicle.

Scan Tools main menu appears.
    •  Scan Tool Inoperative

2

Accessthe DTC's using the scan tool.

No DTC's found.

The module(s) listed will have DTC's present.

Refer to Diagnostic Trouble Code (DTC) List/Type .

3

  1. Select Body Diagnostics from the scan tools menu.
  2. Select SIR UART Data Line information.
  3. Access DTC's using the scan tool.

No DTC's found.

No communication with the vehicle, or Diagnostic Link Connector.

Refer to Scan Tool Does Not Communicate with UART Data Line.

4

  1. Establish communication with the Electronic Brake Control Module (EBCM)
  2. Access DTC's using the scan tool.

No DTC's found.

No communication with the vehicle, or Diagnostic Link Connector.

Refer to No Communication with EBCM.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.