General Information

Head Unit
U1003 Temperature Sensor Signal Error in Head Unit - General Information

Component Location





General Description

The temperature sensor of Head unit detect the temperature rising to prevent abnormal status of Head Unit.

DTC Description

This code is set when a temperature sensor of Head unit detect that the temperature is over 85°C, At that time Tuner & Amplifier can be abnormal status. If the temperature is around 85°C, the fan is running to make the temperature down. After cooling, Tuner&Amplifier is normal status under 75°C.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig.1) Start of Wake up line diagnosis
Fig.2) Completion of Wake up line diagnosis