Steering Switch Signal A Circuit (TEL Adapter Unit To Audio Unit)

STEERING SWITCH SIGNAL A CIRCUIT (TEL ADAPTER UNIT TO AUDIO UNIT)





Description
- Transmits the steering switch signal to audio unit.
- Transmits the steering switch signal to audio unit through TEL adapter unit.




Diagnosis Procedure
1.CHECK STEERING SWITCH SIGNAL A CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect audio unit connector and TEL adapter unit connector.
3. Check continuity between audio unit harness connector and TEL adapter unit harness connector.





4. Check continuity between audio unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair harness or connector.
2.CHECK TEL ADAPTER UNIT POWER SUPPLY
Check TEL adapter unit power supply. Power Supply And Ground Circuit.
Is the inspection result normal?
YES - GO TO 3.
NO - Replace TEL adapter unit. Removal And Installation Bose Audio Without Navigation.
3.CHECK AUDIO UNIT VOLTAGE
1. Connect audio unit connector and TEL adapter unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace audio unit. Removal And Installation Bose Audio Without Navigation.
4.CHECK STEERING SWITCH
1. Turn ignition switch OFF.
2. Check steering switch. SEE Component Inspection.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace steering switch. Removal And Installation Bose Audio Without Navigation.




Component Inspection





Measure the resistance between the steering switch connector.