Identifying the Brake System

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

Vehicles that are equipped with AdvanceTrac® with RSC®  can be identified by:

• a 47-pin ABS module connector.
• the presence of a stability control sensor cluster located under the front floor console.
• the presence of a Steering Angle Sensor Module (SASM) behind the clockspring.

If the vehicle is equipped with AdvanceTrac® with RSC®  , refer to ANTI-LOCK CONTROL - TRACTION CONTROL AND STABILITY ASSIST  in this service information for diagnosis of the ABS system with AdvanceTrac® with RSC®  .

1. Verify the customer concern.
2. Visually inspect the following components for obvious signs of mechanical or electrical damage:
   VISUAL INSPECTION CHART
   
   

   Mechanical	Electrical
   Base brake system Incorrectly inflated tires Mismatched wheels or tires on the vehicle Steering components Suspension components Wheel speed sensor magnetic strips	ABS module Battery Junction Box (BJB) fuse(s): 12 (30A) 15 (20A) Central Junction Box (CJB) fuse 161 (7.5A) Hydraulic Control Unit (HCU) Wheel speed sensors Wiring, terminals or connectors

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE: Make sure to use the latest scan tool software release.
4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC  are provided to the VCM  .
5. 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 MODULE COMMUNICATIONS NETWORK article, 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 is ON.
   • verify the scan tool operation with a known good vehicle.
   • refer to MODULE COMMUNICATIONS NETWORK article 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 MODULE COMMUNICATIONS NETWORK article.
   • 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  (in this service information) and/or the Instrument Cluster (IC) DTC Chart in INSTRUMENT CLUSTER ILLUMINATION & INSTRUMENT PANEL ILLUMINATION article. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULE article.
10. If no DTCs related to the concern are retrieved, Go to SYMPTOM CHART .