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Inspection Procedure 1: Steering wheel audio remote control switch does not function. <vehicles with radio and CD player>
 
 
cautionBefore replacing the radio and CD player 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 steering wheel audio remote control switch, the radio and CD player, or the clock spring may be defective.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of steering wheel audio remote control switch
  • Malfunctions of radio and CD player
  • Malfunction of the clock spring
  • Damaged harness wires and connectors
 
 
 
DIAGNOSIS
STEP 1. Check the steering wheel audio remote control switch.
Remove the remote controlled radio switch. Then check continuity between the steering wheel audio remote control 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 remote controlled radio 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 .
 
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 radio and CD player connector C-103 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Is radio and CD player connector C-103 in good condition?
Go to Step 5.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection .
 
STEP 5. Check the wiring harness between radio and CD player connector C-103 (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 radio and CD player connector C-103 (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, 4) 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 radio and CD player 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 radio and CD player.