Headlamp Control Module: Description and Operation

With the Ignition SW turned ON, current flows to TERMINAL 1 of the Light Retainer through Relay ECU-IG Fuse.
Voltage is applied at all times to TERMINAL 8 of the Light Retainer Relay through the taillight relay (coil side), and to TERMINAL 7 of the Light Retainer Relay through the head relay (coil side).

1. NORMAL LIGHTING OPERATION
ON>
With light control SW turned to TAIL position, a signal is input into TERMINAL 2 of the Light Retainer Relay. According to this signal, the current flow to TERMINAL 8 of the relay flows to TERMINAL 2 to TERMINAL 2 of the light control SW --> TERMINAL 11--> GROUND and taillight relay causes taillight to turn ON.

ON>
With light control SW turned to HEAD position, a signal is input into TERMINAL 3 of the Light Retainer Relay. According to this signal, the current flow to TERMINAL 7 of the relay flows through TERMINAL 3 to TERMINAL 13 of the light control SW --> TERMINAL 11 --> GROUND causing the headlights and taillights to turn ON. The taillight circuit is same as above. (See ON>.).

2. LIGHT AUTO TURN OFF OPERATION
With lights ON and Ignition SW turned OFF (input signal goes to TERMINAL 1 of the Light Retainer relay), when door on driver's side is opened (input signal goes to TERMINAL 5 of the Light Retainer relay), the relay operates and the current is cut OFF which flows from TERMINAL 8 of the relay to TERMINAL 2 and from TERMINAL 7 to TERMINAL 3. As a result, all lights are turned OFF automatically.