Celica ST Ltd Ed Liftback L4-1762cc 1.8L DOHC MFI (1997)
Headlamp Control Module: Description and Operation
With the Ignition SW turned ON, current flows to TERMINAL 7 of the integration relay through the GAUGE fuse. Voltage is applied at all times to
TERMINAL A-2 of the integration relay through the Taillight relay (Coil Side), and to TERMINAL A-3 through the Head relay (Coil Side)
1. NORMAL LIGHTING OPERATION
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Turn Taillight ON
With light control SW turned to TAIL position, a signal is input to TERMINAL A-1 of the integration relay, due to this signal, current from
TERMINAL A-2 of the relay flows to TERMINAL A-1 --> TERMINAL 14 of the light control SW --> TERMINAL 16 --> GROUND,
and the Taillight relay causes Taillight to turn ON.
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Turn Headlight ON
With light control SW turned to HEAD position, a signal is input to TERMINAL A-4 of the integration relay. Due to this signal, current from
TERMINAL A-3 of the relay flows to TERMINAL A-4 --> TERMINAL 13 of the light control SW --> TERMINAL 16 --> GROUND in
the Headlight circuit, and Headlight relay causes Headlights to turn ON.
2. LIGHT AUTO TURN OFF OPERATION
With light ON and the ignition SW turned OFF (Input Signal goes To TERMINAL 7 Of The Relay), when the driver's Door is opened (Input
Signal goes to TERMINAL 6 of the Relay), the relay operates and current cut off from TERMINAL A-2 of the relay to TERMINAL A-1in
Taillight circuit and from TERMINAL A-3 to TERMINAL A-4 in Headlight circuit. As a result, all lights are turned OFF automatically.
