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Pinpoint Test I: The Traction Control Indicator on the Switch is Always Illuminated

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Lighting Control Module for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Vehicle Dynamic Systems for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Instrument Cluster for schematic and connector information.

Normal Operation 

The ABS module sends a reference voltage to the traction control switch along circuit 959 (GY) to the traction control switch. When the switch is pressed, the reference voltage continues through the switch to ground along circuit 57 (BK). The ABS module then disables the traction control system when it detects this change in reference voltage and sends a message to the instrument cluster along the high-speed controller area network (HS-CAN) bus to illuminate the indicator. After receiving the ABS module message, the instrument cluster sends a message to the lighting control module (LCM) along the serial communication protocol (SCP) bus to illuminate the indicator and the LCM supplies voltage to circuit 961 (WH/PK) which illuminates the indicator.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST I: THE TRACTION CONTROL INDICATOR ON THE SWITCH IS ALWAYS ILLUMINATED 

  1. I1 CHECK THE ABS MODULE FOR DTCs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Using the scan tool, retrieve and document any continuous DTCs.
    • Are DTCs retrieved? 
    1. YES  : Go to ABS MODULE DIAGNOSTIC TROUBLE CODE INDEX .
    2. NO  : Go to  I2.
  2. I2 CHECK THE LCM OUTPUT 
    NOTE: To access the ABS module connector, remove the air cleaner assembly.
    • Key in OFF position.
    • Disconnect: LCM C2145a
    • Key in ON position.
    • Does the traction control switch indicator continue to illuminate? 
    1. YES  : REPAIR circuit 961 (WH/PK). CLEAR the DTCs. TEST the system for normal operation.
    2. NO  : Go to  I3.
  3. I3 CHECK THE COMMUNICATION WITH THE LCM 
    • Key in OFF position.
    • Connect: LCM C2145a
    • Key in ON position.
    • Using the scan tool, check the communication with the LCM.
    • Does the scan tool communicate with the LCM? 
    1. YES  : Go to  I4.
    2. NO  : REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication concern.
  4. I4 CHECK THE COMMUNICATION WITH THE INSTRUMENT CLUSTER 
    • Using the scan tool, check the communication with the instrument cluster.
    • Does the scan tool communicate with the instrument cluster? 
    1. YES  : Go to  I5.
    2. NO  : REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication concern.
  5. I5 CHECK THE ABS TRACTION CONTROL SYSTEM PID (TCYC_FS) 
    • Enter the following diagnostic mode on the diagnostic tool: ABS DataLogger
    • Check the state of the TCYC_FS PID.
    • Does the PID display ACTIVE? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
    2. NO  : Go to  I6.
  6. I6 CHECK FOR CORRECT LCM OPERATION 
    • Key in OFF position.
    • Disconnect all the LCM connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect all the LCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  I7.
  7. I7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect the instrument cluster connector.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect the instrument cluster connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, & WARNING CHIMES article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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