Confirmation Step 2: Steering Switch Confirmation [Entire Audio System]

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 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 operation: Follow the "Confirmation Step 1". 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.
2		No	If the audio unit side connector is wrong: Replace the audio unit. (See AUDIO 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 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 OFF (LOCK). 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 clock spring (16-pin) terminal (part wiring harness-side). Terminal 1N (24-pin) - Terminal 4G (16-pin) Terminal 1P (24-pin) - Terminal 4I (16-pin) Is there the continuity?	Yes	Replace the steering switch. (See STEERING SWITCH REMOVAL/INSTALLATION .)
4		No	Repair or replace the suspect wiring harness.