Component Tests and General Diagnostics

Audio System Inspection

Voltage and Signal Check

1) Remove audio unit or audio amplifier (with connector connected).
- Audio unit: Service and Repair
- Audio amplifier: Service and Repair
2) Check voltage using circuit tester and oscilloscope.

NOTE:
- Confirm that battery voltage is 11 V or more.
- An "Ignition mode" in the following table, represents a power supply mode available with keyless push start system. For more details, refer to Description of Keyless Engine Start Function Description of Keyless Engine Start Function.
- Outputs from terminals marked with asterisk (*) cannot be measured with voltmeter because they are pulse signals. Use oscilloscope for measuring these outputs.

[A] G231 connector (microphone (if equipped))

[B] G248 connector (audio unit)

Inspection of BCM and Its Circuits

[C] G267 connector (radio antenna feeder)

[D] L11 connector (audio amplifier (if equipped))

[E] L12 connector (audio amplifier (if equipped))

[F] G232 connector (rearview camera (if equipped))

Reference Waveform

Oscilloscope display

Shown below is typical waveform display provided by oscilloscope.

NOTE:

- Display includes the following types of data:

- Waveforms may vary with measurement conditions and vehicle specifications.

Speaker / microphone wave

NOTE:

Voltage changes depending on sound volume and quality.

Microphone signal (1)