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Home >> Lexus >> 2002 >> GS 300 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Systems >> Circuit Tests >> Headlight Relay Circuit >> Circuit Description
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Circuit Description

The headlight relay will be ON by operating the headlight switch. The transistor which activates the taillight relay has 2 types:

  1. One activates directly by the headlight switch for fail safe operation.
  2. Another activates by the body ECU No. 2.
The one that activates by body ECU No. 2 has 2 systems and prevents the headlight from turning off at the time of one system trouble in the automatic operation circuit.

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