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Home >> Acura >> 2020 >> TLX SH-AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> VSA System - Testing & Troubleshooting >> VSA System Symptom Troubleshooting >> ABS Indicator, Brake System Indicator (Red), VSA Indicator, And Brake System Indicator (Amber) Do Not Go Off (With ACC) (2015-17)

ABS Indicator, Brake System Indicator (Red), VSA Indicator, And Brake System Indicator (Amber) Do Not Go Off (With ACC) (2015-17)

NOTE:

Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting - Refer to: DLC Circuit Troubleshooting (L4) (2015-17), or DLC Circuit Troubleshooting (V6, Without CAN gateway) (2015-17), or DLC Circuit Troubleshooting (V6, Without SH-AWD, With CAN gateway) (2015-17), or DLC Circuit Troubleshooting (V6, With SH-AWD and CAN gateway) (2015-17) .

  1. DTC check

    - 1. Turn the vehicle to the ON mode.

    - 2. Check for DTCs with the HDS.

    DTC Description DTC Freeze Frame
         

    Are there DTCs indicated?

    YES 

    Do the DTC troubleshooting.

    NO 

    Go to step 2.

  2. CAN gateway system DTC check

    - 1. Turn the vehicle to the ON mode.

    - 2. Check for CAN gateway system DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  
    U0047-00 CAN Gateway F-CAN ch B Bus Off  
    U3000-49 CAN Gateway Internal Failure  

    Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

    YES 

    Go to indicated DTCs troubleshooting.

    NO 

    Go to step 3.

  3. Fuse check 1

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Check the following fuse.

    Fuse No. B10 (7.5 A)
    Location Under-dash fuse/relay box

    Is the fuse OK?

    YES 

    The fuse is OK. Reinstall the fuse, then go to step 4.

    NO 

    Replace the fuse. Turn the vehicle to the ON mode, then the OFF (LOCK) mode. If the fuse blows again, repair a short to ground in the No. B10 (7.5 A) fuse circuit.

  4. Fuse check 2

    - 1. Check the following fuse.

    Fuse No. A1-4 (20 A)
    Location Under-hood fuse/relay box

    Is the fuse OK?

    YES 

    The fuse is OK. Reinstall the fuse, then go to step 5.

    NO 

    Replace the fuse. If the fuse blows again, repair a short to ground in the No. A1-4 (20 A) fuse circuit.

  5. Gauge control module operation check

    - 1. Do the gauge control module self-diagnostic function.

    Is the gauge control module OK?

    YES 

    Go to step 6.

    NO 

    Replace the gauge control module .

  6. Open wire check (IG1 VSA/ABS line)

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the following connector.

    VSA modulator-control unit 38P connector

    - 3. Turn the vehicle to the ON mode.

    - 4. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      VSA modulator-control unit 38P connector: disconnected
    Test point 1 VSA modulator-control unit 38P connector No. 36 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    The IG1 VSA/ABS wire is OK. Go to step 7.

    NO 

    Repair an open in the wire between the No. B10 (7.5 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.

  7. Open wire check (GND line)

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      VSA modulator-control unit 38P connector: disconnected
    Test point 1 VSA modulator-control unit 38P connector No. 3 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    Test point 2 Body ground

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 8.

    NO 

    Repair an open in the wire between the VSA modulator-control unit and body ground (G206).

  8. Open wire check (+B ABS/VSA FSR line)

    - 1. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      VSA modulator-control unit 38P connector: disconnected
    Test point 1 VSA modulator-control unit 38P connector No. 4 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    The +B ABS/VSA FSR wire is OK. Go to step 9.

    NO 

    Repair an open in the wire between the No. A1-4 (20 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.

  9. F-CAN circuit communication check

    - 1. Reconnect the following connector.

    VSA modulator-control unit 38P connector

    - 2. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

    F-CAN Bus Connected Unit Check

    Which result is indicated?

    Gauge control module (Bus A) is Not Available 

    Go to step 10.

    VSA modulator-control unit (Bus A) is Not Available 

    Go to step 11.

    VSA modulator-control unit (Bus B) is Not Available 

    Go to step  12.

    VSA modulator-control unit and gauge control module are Detected 

    Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

  10. Open wire check (F-CAN A_L, F-CAN A_H lines)

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the following connectors.

    CAN gateway 24P connector
    Gauge control module 32P connector

    - 3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      Gauge control module 32P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 15
    Test point 2 Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Connector for Inputs and Outputs (Without SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17)
    Test point 1 CAN gateway 24P connector No. 14
    Test point 2 Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17)
    GHH204972Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Check for loose terminals in the CAN gateway 24P connector and the gauge control module 32P connector. If they are OK, substitute a known-good gauge control module , then retest. If the indicators come on then go off after substitution, replace the original gauge control module .

    NO 

    Repair an open in the wire between the gauge control module and the CAN gateway.

  11. Open wire check (F-CAN A_L, F-CAN A_H lines)

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the following connectors.

    CAN gateway 24P connector
    VSA modulator-control unit 38P connector

    - 3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      VSA modulator-control unit 38P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 15
    Test point 2 VSA modulator-control unit 38P connector No. 26 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    Test point 1 CAN gateway 24P connector No. 14
    Test point 2 VSA modulator-control unit 38P connector No. 38 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    GHH204973Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_L and F-CAN A_H wires are OK. Go to step 13.

    NO 

    Repair an open in the wire between the VSA modulator-control unit and the CAN gateway.

  12. Open wire check (F-CAN B_L, F-CAN B_H lines)

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the following connectors.

    CAN gateway 24P connector
    VSA modulator-control unit 38P connector

    - 3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      VSA modulator-control unit 38P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 10
    Test point 2 VSA modulator-control unit 38P connector No. 20 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    Test point 1 CAN gateway 24P connector No. 11
    Test point 2 VSA modulator-control unit 38P connector No. 31 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or VSA Modulator-Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) 
    GHH204974Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_L and F-CAN B_H wires are OK. Go to step 13.

    NO 

    Repair an open in the wire between the VSA modulator-control unit and the CAN gateway.

  13. VSA modulator-control unit check (update)

    - 1. Reconnect the following connectors.

    CAN gateway 24P connector
    VSA modulator-control unit 38P connector

    - 2. Update the VSA modulator-control unit if it does not have the latest software.

    - 3. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

    - 4. Check the ABS indicator, brake system indicator (red), VSA indicator, and brake system indicator (amber) for several seconds when you turn the vehicle to the ON mode.

    Do the indicators come on then go off?

    YES 

    Troubleshooting is complete.

    NO 

    Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD), or VSA Modulator-Control Unit Removal and Installation (Without SH-AWD) .

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