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Home >> Lexus >> 2003 >> LS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Systems >> Circuit Tests >> Headlight Relay Circuit >> Circuit Description

Circuit Description

Headlight relay becomes ON by operating the headlight switch. When the theft deterrent system is activated, it causes the ECU to turn the headlight relay ON and OFF repeatedly at approximately 0.25 second intervals to flash the headlights. For circuit diagram, see Fig 1. In this condition, if any of the following operations is done, the ECU turns the headlight relay off to stop the headlight flashing:

Fig 1: Identifying Headlight Relay Circuit
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