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Inspection Procedure 2: Steering wheel audio remote control switch does not function. <vehicles with smartphone link display audio>
 
 
cautionBefore replacing the multivision display or steering wheel audio remote control switch, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the steering wheel audio remote control switch, the multivision display, or the clock spring may be defective.
 
 
TROUBLESHOOTING HINTS
  • The steering wheel audio remote control switch may be defective
  • The multivision display may be defective
  • The clock spring may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
 
DIAGNOSIS
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 PositionTester ConnectionMeasurement Value
"MODE" switch pushed1 - 2Approximately 270 Ω
"CH UP" switch pushedApproximately 740 Ω
"CH DOWN" switch pushedApproximately 1.3 kΩ
"VOL UP" switch pushedApproximately 2.1 kΩ
"VOL DOWN" switch pushedApproximately 3.1 kΩ
Is the steering wheel audio remote control switch in good condition?
Go to Step 2.
Replace the steering wheel audio remote control switch.
 
STEP 2. Check clock spring connector C-304 and C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are clock spring connector C-304 and C-312 in good condition?
Go to Step 3.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . The steering wheel audio remote control switch should work normally.
 
STEP 3. Check the clock spring.
Check whether the clock spring is in good condition. Refer to GROUP 52B, Driver’s air bag module and clock spring .
Is the check result normal?
Go to Step 4.
Replace the clock spring.
 
STEP 4. Check multivision display connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Is multivision display connector C-138 in good condition?
Go to Step 5.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . The steering wheel audio remote control switch should work normally.
 
STEP 5. Check the wiring harness between multivision display connector C-138 (terminal 22, 32) and clock spring connector C-312 (terminal 2, 3).
  • Check the communication lines for open and short circuit.
Is the wiring harness between multivision display connector C-138 (terminal 22, 32) and clock spring connector C-312 (terminal 2, 3) in good condition?
Go to Step 6.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
 
STEP 6. Check steering wheel audio remote control switch connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Is steering wheel audio remote control switch connector C-317 in good condition?
Go to Step 7.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . The steering wheel audio remote control switch should work normally.
 
STEP 7. Check the wiring harness between steering wheel audio remote control switch connector C-317 (terminal 2, 1) and clock spring connector C-304 (terminal 2, 3).
  • Check the communication lines for open and short circuit.
Is the wiring harness between steering wheel audio remote control switch connector C-317 (terminal 2, 1) and clock spring connector C-304 (terminal 2, 3) in good condition?
  • Go to Step 8.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
 
STEP 8. Retest the system
Check whether you can operate the multivision display by using the steering wheel audio remote control switch.
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.