Inspection Procedure 2: Steering wheel audio remote control switch illumination does not come on.







TECHNICAL DESCRIPTION (COMMENT)




PROBABLE CAUSES



  • Malfunction of steering wheel audio remote control switch
  • Malfunctions of ETACS-ECU
  • Malfunction of the clock spring
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check if the tail lamp illuminates normally.


Q. Is the check result normal?

Go to Step 2.
Troubleshoot the headlamp. Refer to .

STEP 2. Connector check: C-311 steering wheel audio remote control switch connector




Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

STEP 3. Measure the resistance at C-311 steering wheel audio remote control switch connector.




(1)Disconnect the connector, and measure at the wiring harness side.

(2)Resistance between terminal No.5 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

STEP 4. Check the wiring harness between C-311 steering wheel audio remote control switch connector terminal No.5 and body earth.





  • Check the earth wires for open circuit.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

STEP 5. Check the steering wheel audio remote control switch.


Check if the steering wheel audio remote control switch illuminates. (Refer to ).

Q. Is the check result normal?

Go to Step 6.
Replace the steering wheel audio remote control switch.

STEP 6. Connector check: C-310 and C-306 clock spring connectors




Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

STEP 7. Check the clock spring.


Check whether the clock spring is in good condition (Refer to GROUP 52B - Air bag module and clock spring ).

  • Check if continuity exists between C-310 clock spring connector terminal No.1 and C-306 clock spring connector terminal No.6.

Q. Is the check result normal?

Go to Step 8.
Replace the clock spring.

STEP 8. Check the wiring harness between C-311 steering wheel audio remote control switch connector terminal No.1 and C-310 clock spring connector terminal No.1.





  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?

Go to Step 9.

Repair the wiring harness.

STEP 9. Connector check: C-218 ETACS-ECU connector




Q. Is the check result normal?

Go to Step 10.

Repair the defective connector.

STEP 10. Check the wiring harness between C-218 ETACS-ECU connector terminal No.15 and C-306 clock spring connector terminal No.6.





  • Check the communication line for open circuit and short circuit.



note Prior to the wiring harness inspection, check C-138,C-09 joint connectors and C-209 junction block connector, and repair if necessary.

Q. Is the check result normal?


    Go to Step 11.

Repair the wiring harness.

STEP 11. Retest the system


Check whether the illumination of the steering wheel audio remote control switch comes on normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the steering wheel audio remote control switch.