GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Catera 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Data Link Communications System Check

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.
    • Blank Screen
    • No power to the scan tool

Refer to Scan Tool Inoperative

2
  1. Select BODY DIAGNOSTICS from the scan tools menu.
  2. Select BODY CONTROL MODULE.
  3. Select DIAGNOSTIC TROUBLE CODES (DTC)
  4. Access DTC's using the scan tool.
  5. Record current and history DTC's.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or the data link connector. Refer to Scan Tool Does Not Communicate w/Class 2 Data Line in Body Control Systems.

3
  1. Select INSTRUMENT PANEL CLUSTER Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With Instrument Cluster.

4
  1. Select HEATING AND AIR CONDITIONING Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With Heater and A/C Control.

5
  1. Select SUPPLEMENTAL INFLATABLE RESTRAINT Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With SDM.

6
  1. Select MEMORY SEAT MODULE Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With MSM.

7
  1. Select IMMOBILIZER Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With Theft Deterrent Module (Immobilizer).

8
  1. Select LEVELING SENSOR Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With ALC Sensor.

9
  1. Select CRUISE CONTROL Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With Cruise Control Module.

10
  1. Select POWER ROOF Data Line information.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With Sun Roof Actuator.

11
  1. Establish communication with the electronic brake traction control module (EBTCM) found in CHASSIS.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic link connector. Refer to Scan Tool Does Not Communicate With EBTCM.

12
  1. Select VARIABLE EFFORT STEERING.
  2. Establish communication with the power steering control module (PSCM).
  3. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or with the diagnostic data link connector.
        Refer to Scan Tool Does Not Communicate With Power Steering Control Module.

13
  1. Establish communication with the engine control module (ECM) and transmission control module (TCM) found in POWERTRAIN.
  2. Access DTC's using the scan tool.

No DTC's found.
    • DTC's are present. Refer to applicable DTC list.
    • No communication with the vehicle or the diagnostic link connector. Refer to Scan Tool Does Not Communicate With ECM or Scan Tool Does Not Communicate With TCM.

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