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Pinpoint Test Ai: Abs (Anti-Lock Brake System) Module Communication Concern With The RCM (Restraints Control Module)

  1. Refer to Vehicle Dynamic Systems for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the RCM sends messages to the GWM over the HS-CAN2, the GWM relays these messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within a certain time frame, the ABS module sets a DTC. For information on the messages sent to the ABS module by the RCM,

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS C0061:28 Lateral Acceleration Sensor: Signal Bias Level Out Of Range/Zero Adjustment Failure This DTC sets when the ABS module detects the sensor signal is greater than the programmed maximum plausible sensor signal.
    ABS C0061:64 Lateral Acceleration Sensor: Signal Plausibility Failure The ABS module creates a reference value based on all other available sensor signals and compares this value. If the 2 values differ by more than the predetermined value, this DTC is set.
    ABS C0062:64 Longitudinal Acceleration Sensor: Signal Plausibility Failure This DTC sets if the sensor signal does not match the other stability sensor signals (steering angle, yaw rate, longitudinal acceleration or lateral acceleration).
    ABS C0063:28 Yaw Rate Sensor: Signal Bias Level Out Of Range/Zero Adjustment Failure This DTC sets if the absolute value of the longitudinal acceleration message from the RCM is outside of the maximum allowable range.
    ABS C0063:64 Yaw Rate Sensor: Signal Plausibility Failure This DTC sets if the sensor signal does not match the other stability sensor signals (steering angle, yaw rate, longitudinal acceleration or lateral acceleration).
    ABS C0064:28 Roll Rate Sensor: Signal Bias Level Out Of Range/Zero Adjustment Failure This DTC sets when the ABS module detects the sensor signal is greater than the programmed maximum plausible sensor signal.
    ABS C0064:64 Roll Rate Sensor: Signal Plausibility Failure This DTC sets when the ABS module detects the sensor signal does not match the other stability sensor signals.
    ABS U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the RCM within the allowed time.
    ABS U0452:02 Invalid Data Received From Restraints Control Module: General Signal Failure This DTC sets if the yaw rate, roll rate, longitudinal acceleration or lateral acceleration messages from the RCM are invalid.
    ABS U0452:41 Invalid Data Received From Restraints Control Module: General Checksum Failure This DTC sets if the yaw rate, roll rate, longitudinal acceleration or lateral acceleration messages from the RCM are not received.
    ABS U0452:86 Invalid Data Received From Restraints Control Module: Signal Invalid This DTC sets if the yaw rate, roll rate, longitudinal acceleration or lateral acceleration counter signal message from the RCM does not update.

    Possible Causes 

    • Network communication concern
    • Wiring, terminals or connectors
    • RCM
    • ABS Module

    NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

  2. AI1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from all modules.

    Does the RCM pass the Network Test? 

    Yes  DIAGNOSE the RCM DTC s. REFER to: Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) . . If there are no RCM DTC s, GO to  AI2
    No  DIAGNOSE the no communication with the RCM. REFER to: Controller Area Network (CAN) Module Communications Network - Electric .

  3. AI2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR DTC (DIAGNOSTIC TROUBLE CODE) S

    • Using a diagnostic scan tool, clear the ABS DTC s.

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the ABS self-test.

    • Record the ABS module DTC s.

    Are any of the DTC s from the Fault Trigger Conditions table present and active in the ABS module? 

    Yes  GO to  AI3
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  4. AI3 CHECK FOR VOLTAGE-RELATED DIAGNOSTIC TROUBLE CODES (DTCS) IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE

    • Review the recorded Diagnostic Trouble Codes (DTCs) from the ABS module.

    Is DTC U3003:16 or U3003:17 present in the ABS module? 

    Yes  For ABS module DTC U3003:16, GO to Pinpoint Test A  For ABS module DTC U3003:17, GO to Pinpoint Test F 
    No  GO to  AI4

  5. AI4 CHECK FOR RCM (RESTRAINTS CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) S

    • Using a diagnostic scan tool, carry out the RCM module self-test.

    Are any RCM DTC s present? 

    Yes  DIAGNOSE the RCM DTC s. REFER to: Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) .
    No  GO to  AI5

  6. AI5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

    NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

    • Check the vehicle service history for recent service actions related to the RCM or PCM. If recent service history is found:

      • Verify the correct replacement module was installed.

        • HVBOM may be used to verify correct part fitment.

      • Verify the configuration of replacement module was correct.

        • re-configure the module using as-built data if prior configuration is suspect.

      • Verify the module was not obtained from a like vehicle and installed into customer vehicle.

        • return the swapped module to source vehicle and obtain new replacement module.

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  AI6
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  7. AI6 CHECK FOR LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S SET IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from all modules.

    Is DTC U0151:xx, U0452:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  AI7
    No  GO to  AI8

  8. AI7 CHECK THE RCM (RESTRAINTS CONTROL MODULE) FOR CORRECT OPERATION

    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Connect ABS module C135. Make sure the connector seats and latches correctly.

    • Connect RCM C310A  . Make sure the connector seats and latches correctly.

    • Connect RCM C310B  . Make sure the connector seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM. REFER to: Restraints Control Module (RCM) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  9. AI8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition OFF.

    • Wait one minute.

    • Disconnect ABS module C135.

    • Using a good light source, inspect all disconnected electrical connectors for the following:

      • Corrosion - INSTALL new connector or terminal and clean the module pins
      • Damaged or bent pins - INSTALL new terminals or pins
      • Pushed-out pins - INSTALL new pins as necessary
      • Spread terminals - INSTALL new terminals as necessary

    • Connect ABS module C135. Make sure the connector seats and latches correctly.

    • Connect RCM C310A. Make sure the connector seats and latches correctly.

    • Connect RCM C310B. Make sure the connector seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new ABS module.
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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