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Home >> Acura >> 2017 >> MDX Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Gauges / Meter - Service, Testing And Troubleshooting (Except Hybrid) >> Troubleshooting >> Paddle Shifter + (Upshift Switch) Circuit Troubleshooting

Paddle Shifter + (Upshift Switch) Circuit Troubleshooting

SRS components are located in this area. Review the SRS component locations - Refer to: SRS Component Location Index (2014 2015 2016), or SRS Component Location Index (2017 2018 2019 2020) and the precautions and procedures before doing repair or service.

  1. Problem verification

    - 1. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.

    GHH322029Courtesy of HONDA, U.S.A., INC.

    - 2. Turn the vehicle to the ON mode.

    - 3. Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting.

    - 4. Check the parameter(s) below with the HDS when repeatedly pressing and releasing the paddle shifter + (upshift switch).

    Signal Current conditions
    Values Unit
    Upshift Switch (ST)    

    Is ON indicated when you are pressing the paddle shifter + (upshift switch) and OFF with the switch released?

    YES 

    Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

    NO 

    The failure is duplicated. Go to step 2.

  2. Determine possible failure area (PCM, others)

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

    - 2. Jump the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector A (51P) - Refer to:
    How to Troubleshoot the Fuel and Emissions Systems (2014-20) or
    How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016-20)

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

    Test condition Vehicle OFF (LOCK) mode
      PCM connector A (51P): disconnected
    Test circuit SUPP
    Test point 1 PCM connector A (51P) No. 33 (WHT)
    Test point 2 Body ground
    GHH322030Courtesy of HONDA, U.S.A., INC.

    Is there continuity when pressing the paddle shifter + (upshift switch) and no continuity when the paddle shifter + (upshift switch) is released?

    YES 

    Update the PCM if it does not have the latest software , or substitute a known-good PCM - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2014-20) or How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016-20) then recheck. If the symptom goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020), or PCM Removal and Installation (2014 2015) .

    NO 

    Go to step 3.

  3. Determine possible failure area (paddle shifter + (upshift switch), others)

    - 1. Remove the steering wheel.

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

    Test condition Vehicle OFF (LOCK) mode
      Cable reel connector D (20P): disconnected
      PCM connector A (51P): disconnected
    Test circuit SGND, SUPP
    Test point 1 Cable reel connector D (20P) No. 12 (BLK)
    Test point 2 Cable reel connector D (20P) No. 18 (WHT)
    GHH322031Courtesy of HONDA, U.S.A., INC.

    Is there continuity when pressing the paddle shifter + (upshift switch) and no continuity when the paddle shifter + (upshift switch) is released?

    YES 

    Go to step 5.

    NO 

    Go to step 4.

  4. Paddle shifter + (upshift switch) operation check

    - 1. Disconnect the following connector.

    Paddle shifter + (upshift switch) 4P connector - Refer to:
    Paddle Shifter Removal and Installation (2016 2017 2018 2019 2020), or
    Paddle Shifter Removal and Installation (2014 2015)

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

    Test condition Vehicle OFF (LOCK) mode
      Cable reel connector D (20P): disconnected
      Paddle shifter + (upshift switch) 4P connector: disconnected
      PCM connector A (51P): disconnected
    Test circuit SGND, SUPP
    Test point 1 Paddle shifter + (upshift switch) 4P connector No. 1 (BRN)
    Test point 2 Paddle shifter + (upshift switch) 4P connector No. 2 (BRN)
    GHH322032Courtesy of HONDA, U.S.A., INC.

    Is there continuity when pressing the paddle shifter + (upshift switch) and no continuity when the paddle shifter + (upshift switch) is released?

    YES 

    The paddle shifter + (upshift switch) is OK. Replace the cable reel subharness - Refer to: Steering Wheel Disassembly and Reassembly (2016 2017 2018 2019 2020), or Steering Wheel Disassembly and Reassembly (2014 2015) .

    NO 

    Replace the paddle shifter + (upshift switch) - Refer to: Paddle Shifter Removal and Installation (2016 2017 2018 2019 2020), or Paddle Shifter Removal and Installation (2014 2015) .

  5. Open wire check (SGND line)

    - 1. Remove the cable reel.

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

    Test condition Vehicle OFF (LOCK) mode
      Cable reel connector A (20P): disconnected
      Cable reel connector D (20P): disconnected
      PCM connector A (51P): disconnected
    Test circuit SGND
    Test point 1 Cable reel connector A (20P) No. 1 (BRN)
    Test point 2 Body ground
    GHH322033Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SGND wire is OK. Go to step 6.

    NO 

    Repair an open in the SGND wire between cable reel connector A (20P) and ground (G507), or repair poor ground (G507).

  6. Shorted wire check (SUPP line)

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

    Test condition Vehicle OFF (LOCK) mode
      Cable reel connector A (20P): disconnected
      Cable reel connector D (20P): disconnected
      PCM connector A (51P): disconnected
    Test circuit SUPP
    Test point 1 Cable reel connector A (20P) No. 6 (WHT)
    Test point 2 Body ground
    GHH322034Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short to ground in the SUPP wire between cable reel connector A (20P) and the PCM.

    NO 

    The SUPP wire is not shorted. Go to step 7.

  7. Determine possible failure area (cable reel, others)

    - 1. Reconnect PCM connector A (51P).

    - 2. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      Cable reel connector A (20P): disconnected
      Cable reel connector D (20P): disconnected
    Test circuit SGND, SUPP
    Test point 1 Cable reel connector A (20P) No. 1 (BRN)
    Test point 2 Cable reel connector A (20P) No. 6 (WHT)
    GHH322035Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Replace the cable reel .

    NO 

    Go to step 8.

  8. Open wire check (SUPP line)

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

    - 2. Jump the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector A (51P) - Refer to:
    How to Troubleshoot the Fuel and Emissions Systems (2014-20) or
    How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016-20)

    - 4. Connect terminals A and B with a jumper wire.

    Terminal A Cable reel connector A (20P) No. 6 (WHT)
    Terminal B Body ground
    GHH322036Courtesy of HONDA, U.S.A., INC.

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

    Test condition Vehicle OFF (LOCK) mode
      Cable reel connector A (20P): disconnected
      Cable reel connector D (20P): disconnected
      PCM connector A (51P): disconnected
      Cable reel connector A (20P) No. 6: jumped to body ground
    Test circuit SUPP
    Test point 1 PCM connector A (51P) No. 33 (WHT)
    Test point 2 Body ground
    GHH322037Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SUPP wire is OK. Update the PCM if it does not have the latest software , or substitute a known-good PCM - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2014-20) or How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016-20) or How to Troubleshoot the A/T System (2014 2015) , then recheck. If the symptom goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020), or PCM Removal and Installation (2014 2015) .

    NO 

    Repair an open in the SUPP wire between cable reel connector A (20P) and the PCM.

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