Automatic Light Control Sensor Circuit
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Connector Disconnected
Inspect the automatic light control sensor circuit. Disconnect the connector from the sensor and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (DISCONNECTED) table. If the circuit is as specified, go to the next step. If the circuit is not as specified, inspect the circuit connected to other parts. See WIRING DIAGRAMS .INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (DISCONNECTED)Tester Connection Condition Specified Condition 3 - Ground Constant Continuity 1 - Ground Ignition Switch LOCK Or ACC No Voltage 1 - Ground Ignition Switch ON B+ Voltage 4 - Ground Ignition Switch LOCK Or ACC No Voltage 4 - Ground Ignition Switch ON 5.2 - 9.0 Volts - Connector Connected -
Inspect the automatic light control sensor circuit. Connect the wire harness side connector to the sensor and inspect the wire harness side connector from the back side while the ignition switch is ON, the light control switch is AUTO and the vehicle's surroundings are bright. See CONNECTOR IDENTIFICATION . See INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (CONNECTED) table. If the circuit is as specified, try replacing the sensor with a new one. If the circuit is not as specified, inspect the circuit connected to other parts. See WIRING DIAGRAMS .INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (CONNECTED)
Tester Connection Condition Specified Condition 3 - Ground Constant Continuity 1 - Ground Ignition Switch LOCK Or ACC No Voltage 1 - Ground Ignition Switch ON 9.5 Volts Or More ..... Vehicle Is Under Direct Sun Light (Sensor Not Covered) Taillight & Headlight Are ON