Inspection Procedure 6

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

Steering Wheel Voice Control Switch Illumination Circuit:

TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the steering wheel voice control switch, the steering wheel voice control switch, the combination meter, or the clock spring may be defective.

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

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the combination meter.

Check whether the combination meter works normally.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Diagnose the combination meter. Diagnostic Trouble Code Descriptions

STEP 2. Check steering wheel voice-control switch connector C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is steering wheel voice control switch connector C-209 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component. The steering remote control switch should work normally.

STEP 3. Check the wiring harness between steering wheel voice-control switch connector C-209 (terminal 1) and the ground.

- Check the ground wire for open circuit.

Q: Is the wiring harness between steering wheel voice-control switch connector C-209 (terminal 1) and the ground in good condition?

YES : Go to Step 4.

NO : 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 4. Check clock spring connectors C-204 and C-205 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are clock spring connectors C-204 and C-205 in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component. The steering remote control switch should work normally.

STEP 5. Check the clock spring.

Check whether the clock spring is in good condition (Refer to Driver's air bag module and clock spring [except RALLIART] Inspection or [RALLIART]). Inspection

Q: Is the check result normal?

YES : Go to Step 6.

NO : Replace the clock spring.

STEP 6. Check the wiring harness between steering wheel voice-control switch connector C-209 (terminal 4) and clock spring connector C-204 (terminal 1).

- Check the power supply line open circuit and short circuit.

Q: Is the wiring harness between steering wheel voice control switch connector C-209 (terminal 4) and clock spring connector C-204 (terminal 1) in good condition?

YES : Go to Step 7.

NO : 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 7. Check combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is combination meter connector C-04 in good condition?

YES : Go to Step 8.

NO : Repair or replace the damaged component. The steering remote control switch should work normally.

STEP 8. Check the wiring harness between combination meter connector C-04 (terminal 23) and clock spring connector C-205 (terminal 6).

- Check the power supply line open circuit and short circuit.

Q: Is the wiring harness between combination meter connector C-04 (terminal 23) and clock spring connector C-205 (terminal 6) in good condition?

YES : Go to Step 9.

NO : 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 9. Retest the system

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

Q: Doe the illumination of the steering remote control switch comes on normally?

YES : The trouble can be an intermittent malfunction.

NO : Replace the steering wheel voice control switch.