Inspection Procedure 2: Steering wheel audio remote control switch does not function. <Vehicles with MMCS>


caution Before replacing the multivision display, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)



TROUBLESHOOTING HINTS



  • Malfunction of steering wheel audio remote control switch
  • Malfunctions of multivision display
  • Malfunction of the clock spring
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the steering wheel audio remote control switch.


Remove the steering wheel audio remote control switch. Then check continuity between the switch terminals.
Switch Position
 Tester Connection
 Measurement Value
No push
 2 - 3
 Approximately 3.1 kΩ
1 - 3
 Approximately 71 kΩ
Mode
 Approximately 270 Ω
CH up
 Approximately 740 Ω
CH down
 Approximately 1.3 kΩ
VOL up
 Approximately 2.1 kΩ
VOL down
 Approximately 3.1 kΩ

Q. Is the check result normal?

Go to Step 2.

Replace the steering wheel audio remote control switch.

STEP 2. Connector check: D-302 and D-305 clock spring connector

Q. Is the check result normal?
Go to Step 3.
Repair or replace the damaged component(s).

STEP 3. Check the clock spring.
Check whether the clock spring is in good condition. Refer to GROUP 52B - Air bag module and clock spring .

Q. Is the check result normal?
Go to Step 4.
Replace the clock spring.

STEP 4. Connector check:D-259 multivision display connector

Q. Is the check result normal?
Go to Step 5.
Repair or replace the damaged component(s).

STEP 5. Check the wiring harness between D-259 multivision display connector terminal No. 2, 12 and D-305 clock spring connector terminal No. 2, 3.

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

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Check connector: D-312 steering wheel audio remote control switch connector.

Q. Is the check result normal?
Go to Step 7.
Repair or replace the damaged component(s).

STEP 7. Check the wiring harness between D-312 steering wheel audio remote control switch connector terminal No. 1, 3 and D-302 clock spring connector terminal No. 4, 5.

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

Q. Is the check result normal?

    Go to Step 8.
Repair the wiring harness.

STEP 8. Retest the system
Check whether you can operate the multivision display by using the steering wheel audio remote control switch.

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 multivision display.