Inspection Procedure 6: Steering wheel voice control switch illumination does not come on.

caution

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

PROBABLE CAUSES

Malfunction of steering wheel voice control switch
Malfunctions of combination meter
Malfunction of the clock spring
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-209 steering wheel voice control switch connector

Q. Is the check result normal?

	Go to Step 2.

	Repair the defective connector.

STEP 2. Voltage measurement at C-209 steering wheel voice control switch connector.

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

(2)Turn the ignition switch to the "ACC" position, and turn the tail lamp switch to the "ON" position.

(3)Measure the voltage between terminal No.4 and body earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 3.

	Go to Step 5.

STEP 3. Check the wiring harness between C-209 steering wheel voice control switch connector terminal No.1 and body earth.

Check the earth wire for open circuit.

Q. Is the check result normal?

	Go to Step 4.

	Repair the wiring harness.

STEP 4. Check the steering wheel voice control switch.

Refer to

Q. Is the check result normal?

	Go to Step 10.

	Replace the steering wheel voice control switch.

STEP 5. Connector check: C-204 and C-205 clock spring connectors

Q. Is the check result normal?

	Go to Step 6.

	Repair the defective connector.

STEP 6. 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

<Except RALLIART> or

<RALLIART>).

Q. Is the check result normal?

	Go to Step 7.

	Replace the clock spring.

STEP 7. Check the wiring harness between C-209 steering wheel voice control switch connector terminal No.4 and C-204 clock spring connector terminal No.1.

Check the power supply lines open or short circuit.

Q. Is the check result normal?

	Go to Step 8.

	Repair the wiring harness.

STEP 8. Connector check: C-01 combination meter connector

Q. Is the check result normal?

	Go to Step 9.

	Repair the defective connector.

STEP 9. Check the wiring harness between C-01 combination meter connector terminal No.23 and C-205 clock spring connector terminal No.6.

Check the power supply line for open or short circuit.

Q. Is the check result normal?

	Go to Step 10.

	Repair the wiring harness.

STEP 10. Retest the system

Check whether the illumination of the steering wheel voice 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 voice control switch.