Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis Procedure
- CHECK CONTINUITY BETWEEN TEL ADAPTER UNIT AND MICROPHONE CIRCUIT
- Turn ignition switch OFF.
- Disconnect TEL adapter unit connector and microphone connector.
- Check continuity between TEL adapter unit harness connector and microphone harness connector.
TEL adapter unit Microphone Continuity Connector Terminal Connector Terminal M127 7 R2 1 Existed 8 2 29 4 - Check continuity between TEL adapter unit harness connector and ground.
TEL adapter unit Ground Continuity Connector Terminal M127 7 Not existed 29 Is inspection result OK?
YES: GO TO 2.
NO: Repair harness or connector.
- CHECK VOLTAGE MICROPHONE VCC
- Connect TEL adapter unit connector.
- Turn ignition switch ON.
- Check voltage between TEL adapter unit harness connector and ground.
Probe Standard Reference value (Approx.) (+) (-) TEL adapter unit Connector Terminal Connector Terminal M127 29 M127 8 4.7 - 5.3 V 5.0 V Is inspection result OK?
YES: GO TO 3.
NO: Replace TEL adapter unit. Refer to "REMOVAL AND INSTALLATION ".
- CHECK MICROPHONE SIGNAL
- Turn ignition switch OFF.
- Connect microphone connector.
- Turn ignition switch ON.
- Check signal between TEL adapter unit harness connector.
Probe Condition Standard Reference value (+) (-) TEL adapter unit Connector Terminal Connector Terminal M127 7 M127 8 Give a voice. Wave form synchronized with voice is input. Is inspection result OK?
YES: Replace TEL adapter unit. Refer to "REMOVAL AND INSTALLATION ".
NO: Replace microphone. Refer to "REMOVAL AND INSTALLATION ".
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.