Headlamp Control Module: Description and Operation

With the ignition SW turned ON, the current flows to TERMINAL (B) 12 of the combination meter through GAUGE fuse. Voltage is applied at all times to TERMINAL (E) 6 of the combination meter through the TAIL relay (Coil side), and to TERMINAL (E) 5 of the combination meter through the HEAD relay (Coil side) (USA) or through the daytime running light relay (Main) (Canada).

1. NORMAL LIGHTING OPERATION
(Turn taillight ON)
With the light control SW turned to TAIL position, a signal is input into TERMINAL (E) 2 of the combination meter. According to this signal, the current flowing to TERMINAL (E) 6 of the combination meter flows from TERMINAL (E) 2 to TERMINAL 14 of the light control SW to TERMINAL 16 to GROUND and TAIL relay causes taillight to turn ON.

(Turn headlight ON)
With the light control SW turned to HEAD position, the signals are input into TERMINALS (E) 1 and (E) 2 of the combination meter. According to these signals, the current flowing to TERMINAL (E) 5 of the combination meter flows to TERMINAL (E) 1 to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND in the headlight circuit, and causes TAIL and HEAD relay to turn the light ON. The taillight circuit is same as above.

2. LIGHT AUTO TURN OFF OPERATION
With the lights ON and the ignition SW turned OFF (Input signal goes to TERMINAL (B) 12 of the combination meter), when door on front LH side is opened (Input signal goes to TERMINAL (E) 9 of the combination meter), the relay operates and the current is cut off which flows from TERMINAL (E) 6 of the combination meter to TERMINAL (E) 2 in taillight circuit and from TERMINAL (E) 5 to TERMINAL (E) 1 in headlight circuit. As a result, all lights are turned OFF automatically.