Headlamp: Description and Operation

Voltage from the battery is always applied through the MAIN fuse to the HEAD relay (Coil side), furthermore, to TERMINAL 12 of the daytime running light relay (Main). Voltage through FL MAIN is also applied to the daytime running light relay NO.2 relay (Coil side) to TERMINAL 9 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 4 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 2 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 2 of the relay, activating the daytime running light system, then the current from FL MAIN flows to the daytime running light relay NO.2 relay (Point side) to HEAD (LH-UPR) fuse to TERMINAL 1 of headlight high LH to TERMINAL 2 to TERMINAL 2 of the headlight high RH to TERMINAL 1 to TERMINAL 5 of the daytime running light relay NO.3 relay to TERMINAL 3 to 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 daytime running light relay (Main) to TERMINAL 13 to TERMINAL 13 of the light control SW to TERMINAL 4 to GROUND.
With the HEAD relay on, the current from the HEAD relay (Point side) flows to DRL fuse to the daytime running light relay NO.4 relay (Coil side) to GROUND, turning the daytime running light NO.4 relay on. The current from the HEAD relay (Point side) also flows to HEAD (LWR) fuses to TERMINAL 1 of the headlights (Low) to TERMINAL 2 to 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 relay (Coil side) to TERMINAL 7 of the dimmer SW to TERMINAL 18 to GROUND, turning the HEAD relay on. At the same time, signals are output from TERMINAL 9 and TERMINAL 8 of the dimmer SW to TERMINAL 7 and TERMINAL 7 of the daytime running light relay (Main), activating the daytime running light relay (Main). These signals also activate the daytime running light relay 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 13 of the light control SW to TERMINAL 13 of the daytime running light relay (Main). When the dimmer 5W is set to HIGH position, a signal is output from TERMINAL 9 of the dimmer SW to TERMINAL 8 of the daytime running light relay (Main). These signals activate the daytime running light relay NO.2 relay, so current flows from the daytime running light relay NO.2 relay (Point side) to the HEAD (LH-UPR) fuse to TERMINAL 1 of the headlight high LH to TERMINAL 2 to the daytime running light relay NO.4 relay (Point side) to GROUND, and the current also flows from the daytime running light relay NO.2 relay (Point side) flows to the HEAD (RH-UPR) fuse to the daytime running light relay NO.3 relay (Point side) to TERMINAL 5 of the headlight high RH to TERMINAL 1 to the daytime running light relay NO.4 relay (Point side) to GROUND, causing the headlights (High) to light up.