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Home >> Lexus >> 2002 >> LX 470 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System >> Circuit Tests >> Headlight Control Relay Circuit >> Circuit Description

Circuit Description

When the anti-theft system is activated, it causes the relay in the ECU to switch ON and OFF at approximately 0.4 second intervals. This switches the headlight control relay ON and OFF, thus flashing the headlights. See Fig 1. In this condition, if any of the following operations is done, the relay in the ECU goes OFF and the headlight control relay switches OFF, thus stopping the headlights flashing:

Fig 1: Identifying Headlight Control Relay Circuit
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