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 ABS with traction control can be identified by:

• a 26-pin ABS module connector.
• the absence of a stability control sensor cluster located under the front floor console.
• the absence of a SASM  behind the clockspring.

If the vehicle is equipped with traction control, refer to ANTI-LOCK CONTROL  in this service information for diagnosis of the ABS system with traction control.

1. Verify the customer concern.
2. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING SYSTEM article. If the stoplamps operate correctly, proceed to the next step.
3. Verify the PRNDL operates correctly on the instrument cluster. If the PRNDL does not operate correctly, refer to INSTRUMENTATION & WARNING CHIMES article. If the PRNDL operates correctly, proceed to the next step.
4. Visually inspect for obvious signs of mechanical or electrical damage.
   VISUAL INSPECTION CHART
   
   

   Mechanical	Electrical
   Base brake system Incorrectly inflated tires Mismatched wheels or tires on vehicle Stability control sensor cluster installation Steering Angle Sensor Module (SASM) installation Steering components and 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) SASM  Stability control sensor cluster Stoplamp switch Wheel speed sensors Wiring, terminals or connectors

5. 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.
6. 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  .
7. 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.
8. 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.
9. 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).
NOTE: The vehicle must be at a complete standstill and on a level surface while carrying out the self-test. Any movement of the vehicle during the self-test may result in false DTCs being set.
10. Carry out the self-test diagnostics for the ABS module
11. If the DTCs retrieved are related to the concern, Go to ABS MODULE DTC CHART  in this service information. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULE article.
12. If no DTCs related to the concern are retrieved, Go to SYMPTOM CHART .