Headlamp: Description and Operation

The current from the battery is always flowing from the FL MAIN to MAIN fuse to HEAD relay (Coil side) to TERMINAL 3 of the daytime running light relay (Main), from DOME fuse to TERMINAL 1 of the daytime running light relay (Main) and from the ALT fuse to Taillight relay (Coil side) to TERMINAL 5 of the daytime running light relay (Main).
When the ignition SW is turned ON, the current flowing through the GAUGE fuse flows to TERMINAL 10 of the daytime running light relay (Main).

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage generated at TERMINAL Lof the generator is applied to TERMINAL 9 of the daytime running light relay (Main). If the parking brake lever is pulled up (Parking brake SW ON) at this time, the relay is not activated so the daytime running light system does not operate. If the parking brake lever is then released (Parking brake SW OFF), a signal is input to TERMINAL 18 of the relay.
This activates the daytime running light relay (Main) and the DRL NO.2 relay is turned to ON, so the current flows from the MAIN fuse to the DRL NO.2 relay (Point side) to HEAD LH (UPR) fuse to TERMINAL 1 of the headlight LH (High) to TERMINAL 2 to TERMINAL 2 of the headlight RH (High) to TERMINAL 1 to TERMINAL 3 of the DRL NO.3 relay to TERMINAL 4 to GROUND, causing the headlights to light up (Headlights light up dimmer than normal brightness.). Once the daytime running light system operates and the headlights light up, the headlights remain on even if the parking brake lever is pulled up (Parking brake SW ON).
If the engine stalls and the ignition SW remains ON, the headlights remain light up even through current is no longer output from TERMINAL L of the generator. If the ignition SW is then turned OFF, the headlights go OFF.
If the engine is started with the parking brake lever released (Parking brake SW OFF), the daytime running light system operates and headlights light up when the engine starts.

2. HEADLIGHT OPERATION
When the light control SW is switched to HEAD position and the dimmer SW is set to LOW position, the signal from TERMINAL 13 of the light control SW is input to TERMINAL 7 of the daytime running light relay (Main) via the integration relay. This activates the daytime running light relay (Main) and the HEAD relay is turned ON, so the current flows from the MAIN fuse to HEAD relay (Point side) to DRL NO.2 fuse to DRL NO.3 relay (Coil side) and DRL NO.4 relay (Coil side) to GROUND, turning the DRL NO.3 and NO.4 relay on. Also, current from the HEAD relay (Point side) to H-LP (LWR) fuses to TERMINAL 1 of the headlights (Low) to TERMINAL 2 to GROUND, so the headlights low side light up.
When the light control SW is switched to HEAD position and the dimmer SW is set to HIGH position, the signal from TERMINAL 13 of the light control SW is input to TERMINAL 7 of the daytime running light relay (Main) via the integration relay, and from TERMINAL 7 of the dimmer SW is input to TERMINAL 8 of the daytime running light relay (Main). This activates the daytime running light relay (Main), HEAD relay, DRL NO.2, NO.3 and NO.4 relay is turned on, so the current flows from the MAIN fuse to HEAD relay (Point side) to H-LP (LWR) fuses to headlights (Low) to GROUND, and current also flows from the MAIN fuse to DRL NO.2 relay (Point side) to HEAD LH (UPR) fuse to headlight LH (High) to DRL NO.4 relay (Point side) to GROUND, and current also flows from the DRL NO.2 relay (Point side) to HEAD RH (UPR) fuse to DRL NO.3 relay (Point side) to headlight RH (High) to DRL NO.4 relay (Point side) to GROUND, and current also flows from DRL NO.3 relay (Point side) to high beam indicator light to GROUND, causing the headlights low and high side and the high beam indicator light to light up.
When the dimmer SW is switched to FLASH position, the signal from TERMINALS 7 and 8 of the dimmer SW is input to TERMINALS 7 and 8 of the daytime running light relay (Main). This activates the daytime running light relay (Main), HEAD relay, DRL NO.2, NO.3 and NO.4 relay is turned ON, so the through the MAIN fuse flows the same route as the dimmer SW is set to HIGH position, so the headlights low and high side and the high beam indicator light to light up.

3. AUTOMATIC LIGHT CONTROL OPERATION
When the daytime running light is operating and the Automatic control sensor detects a decrease in the ambient light (It continues less than approx. 2500 lux over about 20 seconds, and it is less than 1000 lux.), the automatic light control operation starts. At the same time, daytime running light relay (Main) is activated, so current flows from the ALT fuse to the Taillight relay (Coil side) to TERMINAL 5 of the daytime running light relay (Main), and the MAIN fuse to the HEAD relay (Coil side) to TERMINAL 3 of the daytime running light relay (Main), activating both the Taillight relay and the HEAD relay, so that the taillights and headlights light up.
When the automatic light control sensor detects an increase in the ambient light (It continues more than approx. 1000 lux over about 20 seconds, and it is more than approx. 2500 lux), the ignition SW is turned to OFF, the light control SW is turned to HEAD position, and the automatic light control operation stops.