CONFIRMATION STEP 2: STEERING SWITCH CONFIRMATION [ENTIRE AUDIO SYSTEM]

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• Verify the customer complaint and identify either the steering switch malfunction or audio unit malfunction.

STEP

INSPECTION

ACTION

1

Is the symptom related to either the steering switch or audio panel/car-navigation unit operation?

Yes

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

No

The symptom is related to the audio panel/car-navigation unit operation:

•  Follow the “Confirmation Step 1” (with audio system).

•  Replace the car-navigation unit (with car-navigation system).
(See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)

The symptom is related to the steering switch operation:

•  Go to the next step.

2

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

•  Inspect both the audio unit/car-navigation 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/car-navigation unit side connector is wrong:

•  Replace the audio unit (with audio system).
(See AUDIO UNIT REMOVAL/INSTALLATION.)

•  Replace the car-navigation unit (with car-navigation system).
(See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)

If the wiring harness-side connector is wrong:

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

3

•  Inspect the continuity between the audio unit/car-navigation 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.

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

―  Terminal 1N (24-pin) — Terminal G (16-pin)

―  Terminal 1P (24-pin) — Terminal I (16-pin)

•  Is there the continuity?

Yes

Replace the steering switch.

No

Repair or replace the suspect wiring harness.

STEP	INSPECTION		ACTION
1	Is the symptom related to either the steering switch or audio panel/car-navigation unit operation?	Yes	Verify the customer complaint and then go to the appropriate symptom troubleshooting procedure.
1		No	The symptom is related to the audio panel/car-navigation unit operation: • Follow the “Confirmation Step 1” (with audio system). • Replace the car-navigation unit (with car-navigation system). (See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.) The symptom is related to the steering switch operation: • Go to the next step.
2	• Disconnect the audio unit/car-navigation unit connector (24-pin). • Inspect both the audio unit/car-navigation 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.
2		No	If the audio unit/car-navigation unit side connector is wrong: • Replace the audio unit (with audio system). (See AUDIO UNIT REMOVAL/INSTALLATION.) • Replace the car-navigation unit (with car-navigation system). (See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.) If the wiring harness-side connector is wrong: • Repair or replace the pins and/or the connector.
3	• Inspect the continuity between the audio unit/car-navigation 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.
3		No	Go to the next step.
4	• Switch the ignition to off. • Remove the steering switch. • Inspect the continuity between the audio unit/car-navigation unit wiring harness-side connector (24-pin) terminal and the steering switch wiring harness-side connector (16-pin) terminal. ― Terminal 1N (24-pin) — Terminal G (16-pin) ― Terminal 1P (24-pin) — Terminal I (16-pin) • Is there the continuity?	Yes	Replace the steering switch.
4		No	Repair or replace the suspect wiring harness.