STEP

INSPECTION

ACTION

1

Is the symptom related to either the steering switch or audio panel operation?

Yes

Verify the customer complaint and then go to the appropriate symptom troubleshooting procedure.

No

• Follow the “Confirmation Step 1”.

  (See CONFIRMATION STEP 1: AUDIO PANEL SWITCH CONFIRMATION [ENTIRE AUDIO SYSTEM].)

The symptom is related to the steering switch operation:

• Go to the next step.

2

• Disconnect the audio unit connector (24-pin).

• Inspect both the audio unit and wiring harness-side connectors for poor connection (such as damaged/pulled-out pins, corrosion).

• Terminal 1N (ST SW1)

• Terminal 1P (ST SW2)

• Are all the pins normal?

Yes

Go to the next step.

No

If the audio unit side connector is damaged:

• Replace the audio unit.

  (See AUDIO UNIT REMOVAL/INSTALLATION.)

If the wiring harness-side connector is damaged:

• Repair or replace the pins and/or the connector.

3

• Inspect the continuity between the audio unit wiring harness-side connector terminal 1N and 1P while operating the steering switch.

• Does the resistance change?

Yes

Verify the customer complaint and then go to the appropriate symptom troubleshooting procedure.

No

Go to the next step.

4

• Switch the ignition to off.

• Remove the steering switch.

  (See STEERING SWITCH REMOVAL/INSTALLATION.)

• Inspect the continuity between the audio unit wiring harness-side connector (24-pin) terminal and the steering switch wiring harness-side connector (16-pin) terminal.

• Terminal 1N (24-pin) — Terminal H (14-pin)

• Terminal 1P (24-pin) — Terminal J (14-pin)

• Is there the continuity?

Yes

Replace the steering switch.

(See STEERING SWITCH REMOVAL/INSTALLATION.)

No

Repair or replace the suspect wiring harness.