CONFIRMATION STEP 2: AUDIO CONTROL SWITCH CONFIRMATION [AUDIO]

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• Verify the customer complaint and identify the malfunction as occurring from either the audio control switch or the audio unit.

Diagnostic procedure

STEP

INSPECTION

ACTION

1

•  Is the symptom related to either the audio control switch or the center panel operation?

Yes

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

No

The symptom is related to the center panel operation:

•  Follow “Confirmation Step 1”.
(See CONFIRMATION STEP 1: AUDIO SWITCH CONFIRMATION [AUDIO].)

The symptom is related to the audio control switch operation:

•  Go to the next step.

2

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

•  Inspect both the audio unit and the wiring harness-side connectors for a 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 malfunctioning:

•  Replace the audio unit.
(See CENTER PANEL UNIT REMOVAL/INSTALLATION.)

(See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)

If the wiring harness-side connector is malfunctioning:

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

3

•  Inspect the continuity between audio unit wiring harness-side connector terminals 1N and 1P while operating the audio control 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 audio control switch.
(See AUDIO CONTROL SWITCH REMOVAL/INSTALLATION.)

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

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

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

•  Is there continuity?

Yes

Replace the audio control switch.

(See AUDIO CONTROL SWITCH REMOVAL/INSTALLATION.)

No

Repair or replace the related wiring harnesses.

STEP	INSPECTION		ACTION
1	• Is the symptom related to either the audio control switch or the center panel operation?	Yes	Verify the customer complaint and then go to the appropriate symptom troubleshooting procedure.
1		No	The symptom is related to the center panel operation: • Follow “Confirmation Step 1”. (See CONFIRMATION STEP 1: AUDIO SWITCH CONFIRMATION [AUDIO].) The symptom is related to the audio control switch operation: • Go to the next step.
2	• Disconnect the audio unit connector (24-pin). • Inspect both the audio unit and the wiring harness-side connectors for a 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 side connector is malfunctioning: • Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION.) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.) If the wiring harness-side connector is malfunctioning: • Repair or replace the pins and/or the connector.
3	• Inspect the continuity between audio unit wiring harness-side connector terminals 1N and 1P while operating the audio control 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 audio control switch. (See AUDIO CONTROL SWITCH REMOVAL/INSTALLATION.) • Inspect the continuity between the audio unit wiring harness-side connector (24-pin) terminal and the audio control switch wiring harness-side connector (16-pin) terminal. ― Terminal 1N (24-pin) — Terminal K (16-pin) ― Terminal 1P (24-pin) — Terminal M (16-pin) • Is there continuity?	Yes	Replace the audio control switch. (See AUDIO CONTROL SWITCH REMOVAL/INSTALLATION.)
4		No	Repair or replace the related wiring harnesses.