Headlamp: Description and Operation

Voltage from the battery is always applied through the FL MAIN and the MAIN fuse to the head fog relay (coil side). Furthermore, to TERMINAL 5 of the daytime running light relay (main), TERMINAL 9 of the dimmer SW, and TERMINAL 6 of the integration relay to TERMINAL 7 of the relay --> TERMINAL 14 of the light control SW. Voltage through FL MAIN is also applied to the DRL no.2 relay (coil side) --> TERMINAL 17 of the daytime running light relay (main).

1. DAYTIME RUNNING LIGHT OPERATION
The daytime running light system is activated only when the light control SW is OFF.

When the engine is started, voltage generated at TERMINAL L of the generator is applied to TERMINAL 11 of the daytime running light relay (main). If the engine is started while the parking brake pedal is being depressed, the signal (parking brake SW ON) is input into TERMINAL 8 of the relay. As a result, the daytime running light system is not activated.

If the engine is started while the parking brake lever is released or the parking brake lever is released while the engine is running, the signal (parking brake SW OFF) is input into TERMINAL 8 of the relay, activating the daytime running light system. Then the current from FL MAIN flows to the DRL no.2 relay (point side) --> HEAD HI (LH) fuse --> TERMINAL 1 of the headlight HIGH LH --> TERMINAL 2 --> TERMINAL 2 of the headlight HIGH RH --> TERMINAL 1 --> TERMINAL 2 of the DRL no.3 relay --> TERMINAL 4 --> GROUND. These cause the headlights to light up (the headlights to light up dimmer than normal brightness.).

Once the daytime running light system is activated and the headlights light up, the headlights remain ON even if the parking brake pedal is depressed (parking brake SW ON).

Even if the engine stalls with the ignition SW ON and there is no voltage from TERMINAL L of the generator, the headlights remain ON. If the ignition SW is turned OFF while the daytime running light system activates, the system stops activating, causing the headlights to turn OFF.

2. HEADLIGHT OPERATION
* (The light control SW at the HEAD position)
When the light control SW is set to HEAD position, the current flows through the head fog relay (coil side) to TERMINAL 6 of the integration relay --> TERMINAL 7 --> TERMINAL 14 of the light control SW --> TERMINAL 16 --> GROUND, turning the head fog relay ON.

With the head fog relay ON, the current from the head fog relay (point side) flows to DRL fuse --> the DRL no.3 relay (coil side) and the DRL no.4 relay (coil side) --> GROUND, turning the DRL no.3 relay and no.4 ON. The current from the head fog relay (point side) also flows to HEAD LO fuses --> TERMINAL 1 of the headlights (low) --> TERMINAL 2 --> GROUND, so the headlights (low) light up.

* (Dimmer SW at FLASH position)
When the dimmer SW is set to FLASH position, current flows through the head fog relay (coil side) to TERMINAL 9 of the dimmer SW --> TERMINAL 17 --> GROUND, turning the headlight relay ON. At the same time, signals are output from TERMINAL 8 and TERMINAL 9 of the dimmer SW to TERMINAL 16 and TERMINAL 5 of the daytime running light relay (main), activating the daytime running light relay (main). These signals also activate the DRL no.2 relay. This causes the headlights (low and high) to light up.

* (Dimmer SW at HIGH position)
When the light control SW is set to HEAD position, a signal is output from TERMINAL 14 of the light control SW to TERMINAL 7 of the integration relay --> TERMINAL 6 --> TERMINAL 5 of the daytime running light relay (main). When the dimmer SW is set to HIGH position, a signal is output from TERMINAL 8 of the dimmer SW to TERMINAL 16 of the daytime running light relay (main). These signals activate the DRL no.2 relay, so current flows from the DRL no.2 relay (point side) to the HEAD HI (LH) fuse --> TERMINAL 1 of the headlight HIGH LH --> TERMINAL 2 --> the DRL no.4 relay (point side) --> GROUND, and the current also flows from the DRL no.2 relay (point side) flows to the HEAD HI (RH) fuse --> the DRL no.3 relay (point side) --> TERMINAL 1 of the headlight HIGH RH --> TERMINAL 2 --> the DRL no.4 relay (point side) --> GROUND, causing the headlights (HI side) to light up.