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Pinpoint Test I: DTC C1996

  1. I1 CHECK FOR ABS MODULE DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self-Test - ABS Module.
    • Are ABS DTCs C1233, C1234, C1235 or C1236 present? 
  2. I2 CHECK THE ABS MODULE YAW RATE (YAW_RATE) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
      • NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
    • Monitor the YAW_RATE PID.
    • Is the YAW_RATE PID value between -0.05 and 0.05? 
    • Yes  : GO to I3.
    • No  : GO to  I7.
  3. I3 CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_ACCL) PID 
      NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
    • Monitor the LAT_ACCL PID.
    • Is the LAT_ACCL PID value between -0.4 and 0.4? 
    • Yes  : GO to I4.
    • No  : GO to  I7.
  4. I4 CHECK THE ABS MODULE LONGITUDINAL ACCELERATION (LONG_ACCL) PID 
      NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
    • Monitor the LONG_ACCL PID.
    • Is the LONG_ACCL PID value between -0.4 and 0.4? 
    • Yes  : GO to I5.
    • No  : GO to  I7.
  5. I5 CHECK THE ABS MODULE ROLL RATE (ROLLRAT) PID 
    NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
    • Monitor the ROLLRAT PID.
    • Is the ROLLRAT PID value between -0.05 and 0.05? 
    • Yes  : GO to I6.
    • No  : GO to  I7.
  6. I6 CHECK THE STEERING WHEEL ANGLE SENSOR POSITION (SWA POS) PID 
    • Monitor the SWA POS PID while rotating the steering wheel clockwise and counterclockwise very slowly, from lock to lock.
    • Does the PID change in intervals of 4.5 degrees and show a 360-degree increase for each complete revolution of the steering wheel? 
  7. I7 CHECK THE RCM INSTALLATION AND MOUNTING SURFACE 
    • Ignition OFF.
    • Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • After depowering the system, refer to Restraints Control Module (RCM) Removal and Installation in SUPPLEMENTAL RESTRAINT SYSTEM . Adhere to all safety warnings in the procedure while inspecting the RCM for damage or incorrect mounting.
    • Inspect the RCM installation and make sure the nuts are fully seated and tightened correctly.
    • Inspect the mounting surface for damage, corrosion or dirt.
    • Is the RCM installed correctly and is the mounting surface clean and free from damage? 
    • Yes  : REPLACE the RCM. REFER to SUPPLEMENTAL RESTRAINT SYSTEM CLEAR the ABS module DTCs. TEST the system for normal
    • No  : REINSTALL or REPAIR the RCM mounting surface or installation. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the ABS module DTCs. TEST the system for normal operation.
  8. I8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS Module C135.
    • Check the connector for:
      • corrosion
      • pushed-out pins
      • spread terminals
    • Connect: ABS Module C135.
    • Make sure the ABS module electrical connector is fully seated, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CLEAR the DTCs. REPEAT the self-test.
    • 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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