Paddle Shifter - (Downshift Switch) Circuit Troubleshooting
Paddle Shifter - (Downshift Switch) Circuit Troubleshooting
SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repair or service.

1.
Problem verification:

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 vehicle. 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.?
     
NO
     
     
     
The failure is duplicated. Go to step 2.
2.
Determine possible failure area (PCM, others):

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)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 20
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, then recheck. If the symptom goes away and the PCM was updated, troubleshooting is complete. If the symptom goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Go to step 3.
3.
Determine possible failure area (paddle shifter - (downshift switch), others):

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 C (20P): disconnected
 
PCM connector A (51P): disconnected
Test point 1
Cable reel connector C (20P) No. 4
Test point 2
Cable reel connector C (20P) No. 12


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.
4.
Paddle shifter - (downshift switch) operation check:

Paddle shifter - (downshift switch) operation check
?1.
Disconnect the following connector.
Paddle shifter - (downshift switch) 2P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Cable reel connector C (20P): disconnected
 
Paddle shifter - (downshift switch) 2P connector: disconnected
 
PCM connector A (51P): disconnected
Test point 1
Paddle shifter - (downshift switch) 2P connector No. 1
Test point 2
Paddle shifter - (downshift switch) 2P connector No. 2


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.?
     
NO
     
     
     
5.
Open wire check (GND line):

Open wire check (GND 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 C (20P): disconnected
 
PCM connector A (51P): disconnected
Test point 1
Cable reel connector A (20P) No. 1
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open in the GND wire between the cable reel and ground (G401), or repair poor ground (G401).?
6.
Shorted wire check (PADDLE SW DOWN line):

Shorted wire check (PADDLE SW DOWN 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 C (20P): disconnected
 
PCM connector A (51P): disconnected
Test point 1
Cable reel connector A (20P) No. 17
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the PADDLE SW DOWN wire between the cable reel and the PCM.?
     
NO
     
     
     
The PADDLE SW DOWN wire is not shorted. Go to step 7.
7.
Open wire check (PADDLE SW DOWN line):

Open wire check (PADDLE SW DOWN line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Cable reel connector A (20P) No. 17
Terminal B
Body ground


?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 C (20P): disconnected
 
PCM connector A (51P): disconnected
 
Cable reel connector A (20P) No. 17: jumped to body ground
Test point 1
PCM connector A (51P) No. 20
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The PADDLE SW DOWN wire is OK. Replace the cable reel.?
     
NO
     
     
     
Repair an open in the PADDLE SW DOWN wire between the cable reel and the PCM.?