Light Control Switch 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 light control switch circuit. See LIGHT CONTROL SWITCH CIRCUIT under CIRCUIT TESTS in BODY CONTROL SYSTEMS article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. Disconnect the connector from the switch and inspect the connector on the wire harness side. For the front side of the combination switch connector, see CONNECTOR IDENTIFICATION . See INSPECTING LIGHT CONTROL SWITCH CIRCUIT (DISCONNECTED) table. If the circuit is not as specified, inspect the wire harness. See WIRING DIAGRAMS .

INSPECTING LIGHT CONTROL SWITCH CIRCUIT (DISCONNECTED)

Tester Connection	Condition	Specified Condition
16 - Ground	Constant	Continuity

Connector Connected - Inspect the light control switch circuit. Connect the wire harness side connector to the light control and dimmer switch and inspect the connector from the back side. For the front side of the combination switch connector, see CONNECTOR IDENTIFICATION . See INSPECTING LIGHT CONTROL SWITCH CIRCUIT (CONNECTED) table. If the circuit is not as specified, inspect the wire harness. See WIRING DIAGRAMS .

INSPECTING LIGHT CONTROL SWITCH CIRCUIT (CONNECTED)

Tester Connection	Condition	Specified Condition
13 - Ground	Light Control Switch OFF, TAIL Or HEAD	No Voltage
13 - Ground	Light Control Switch AUTO	B+ Voltage
14 - Ground	Light Control Switch OFF Or TAIL	No Voltage
14 - Ground	Light Control Switch HEAD	B+ Voltage
15 - Ground	Light Control Switch OFF	No Voltage
15 - Ground	Light Control Switch TAIL Or HEAD	B+ Voltage