Paddle Shifter - (Downshift 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.
- Problem verification
- 1. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.
- 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 - (downshift switch).
Signal Current conditions Values Unit Downshift Switch (ST) Is ON indicated when you are pressing the paddle shifter - (downshift 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.
- 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 SDNP Test point 1 PCM connector A (51P) No. 34 (RED) Test point 2 Body ground Is there continuity when pressing the paddle shifter - (downshift switch) and no continuity when the paddle shifter - (downshift 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 A/T System (2014 2015), or 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 (2014 2015), or PCM Removal and Installation (2016 2017 2018 2019 2020) .
NO
Go to step 3.
- Determine possible failure area (paddle shifter - (downshift 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, SDNP Test point 1 Cable reel connector D (20P) No. 13 (BLK) Test point 2 Cable reel connector D (20P) No. 15 (RED) Is there continuity when pressing the paddle shifter - (downshift switch) and no continuity when the paddle shifter - (downshift switch) is released?
YES
Go to step 5.
NO
Go to step 4.
- Paddle shifter - (downshift switch) operation check
- 1. Disconnect the following connector.
Paddle shifter - (downshift switch) 4P connector - Refer to:
Paddle Shifter Removal and Installation (2014 2015), or
Paddle Shifter Removal and Installation (2016 2017 2018 2019 2020)- 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 Paddle shifter - (downshift switch) 4P connector: disconnected Test circuit SGND, SDNP Test point 1 Paddle shifter - (downshift switch) 4P connector No. 1 (BRN) Test point 2 Paddle shifter - (downshift switch) 4P connector No. 2 (BRN) Is there continuity when pressing the paddle shifter - (downshift switch) and no continuity when the paddle shifter - (downshift switch) is released?
YES
The paddle shifter - (downshift switch) is OK. Replace the cable reel subharness - Refer to: Steering Wheel Disassembly and Reassembly (2014 2015), or Steering Wheel Disassembly and Reassembly (2016 2017 2018 2019 2020) .
NO
Replace the paddle shifter - (downshift switch) - Refer to: Paddle Shifter Removal and Installation (2016 2017 2018 2019 2020), or Paddle Shifter Removal and Installation (2014 2015) .
- 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 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).
- Shorted wire check (SDNP 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 SDNP Test point 1 Cable reel connector A (20P) No. 3 (RED) Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the SDNP wire between cable reel connector A (20P) and the PCM.
NO
The SDNP wire is not shorted. Go to step 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, SDNP Test point 1 Cable reel connector A (20P) No. 1 (BRN) Test point 2 Cable reel connector A (20P) No. 3 (RED) Is there battery voltage?
YES
NO
Go to step 8.
- Open wire check (SDNP 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. 3 (RED) Terminal B Body ground - 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. 3: jumped to body ground Test circuit SDNP Test point 1 PCM connector A (51P) No. 34 (RED) Test point 2 Body ground Is there continuity?
YES
The SDNP 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), or then recheck. If the symptom goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016 2017 2018 2019 2020) .
NO
Repair an open in the SDNP wire between cable reel connector A (20P) and the PCM.