Steering Wheel Upshift (+) Switch Circuit Troubleshooting

Steering Wheel Upshift (+) Switch Circuit Troubleshooting
SRS components are located in this area. Review the SRS component locations and the precautions and procedures in the SRS before performing repair or service.

1. Remove the steering wheel.
2. Check for continuity between steering wheel switch harness 20P connector terminals No. 15 and No. 7 while pressing the steering wheel upshift switch and when the switch is released.





Is there continuity while pressing the steering wheel upshift (+) switch and no continuity when the switch is released?
YES - Go to step 5.
NO - Go to step 3.

3. Disconnect the steering wheel upshift (+) switch connector.
4. Check for continuity between the steering wheel upshift (+) switch connector terminals while pressing the switch and when the switch is released.





Is there continuity while pressing the switch and no continuity when the switch is released?
YES - Replace the steering wheel switch harness.
NO - Replace the steering wheel upshift (+) switch.

5. Remove the cable reel.
6. Check for continuity between cable reel 20P connector terminal No. 15 and body ground.





Is there continuity?
YES - Go to step 7.
NO - Repair open in the wire between cable reel 20P connector terminal No. 15 and ground (G501), or repair poor ground (G501).

7. Check for continuity between cable reel 20P connector terminal No. 5 and body ground.





Is there continuity?
YES - Repair short in the wire between cable reel 20P connector terminal No. 5 and PCM connector terminal D17.
NO - Go to step 8.

8. Turn the ignition switch ON (II), and shift to the M position.
9. Measure the voltage between cable reel 20P connector terminals No. 5 and No. 15.





Is there battery voltage?
YES - Replace the cable reel.
NO - Go to step 10.

10. Measure the voltage between PCM connector terminal D17 and body ground.





Is there battery voltage?
YES - Repair open in the wire between PCM connector terminal D17 and the cable reel 20P connector.
NO - Check for loose or poor connections at PCM connector terminal D17. If the connection is OK, substitute a known-good PCM and recheck.