Inspection and Verification

Anti-Lock Control

Inspection and Verification

Identifying the Brake System

Two anti-lock control systems are available for this vehicle: ABS with EOTC and ABS enhanced with Electronic Stability Control (ESC). ABS with ESC may also be called AdvanceTrac(R), stability assist or interactive vehicle dynamics (IVD) by the scan tool and other service publications.

Vehicles that are equipped with ESC can be identified by:

- A 47-pin ABS module connector
- The presence of a stability control sensor cluster located under the front row passenger seat.

If the vehicle is equipped with ESC, refer to Anti-Lock Control - Traction Control and Stability Assist for diagnosis of the ABS system with ESC.

1. Verify the customer concern.

2. Visually inspect the following components for obvious signs of mechanical or electrical damage:

Visual Inspection Chart:

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

5. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:

- check the VCM connection to the vehicle.

- check the scan tool connection to the VCM.

- refer to Information Bus, No Power To The Scan Tool, to diagnose no power to the scan tool.

6. If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.

- verify the scan tool operation with a known good vehicle.

- refer to Information Bus to diagnose no response from the PCM.

7. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Information Bus.

- If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).

8. Clear the CMDTCs and carry out the self-test diagnostics for the ABS module and the IC.

9. If the DTCs retrieved are related to the concern, go to ABS Module DTC Chart and/or the Instrument Cluster (IC) DTC Chart. For all other DTCs, refer to Body Control Systems. ABS Module DTC Chart Instrument Cluster (IC) DTC Chart

10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Anti-Lock Control