Headlamp: Description and Operation

Current from battery is always flowing from Main Fuse --> Headlight Relay (Coil Side) --> Diode TERMINAL A- 12 of integration relay.
When the Ignition SW is turned ON, the current flow through the Gauge fuse to integration relay.

1. DAYTIME RUNNING LIGHT OPERATION
when the Engine is started, voltage is generated at TERMINAL 'L' of the generator (Alternator) is applied to TERMINAL A-4 of the integration relay.
If the parking lever is pulled up (Parking Brake SW ON) at this time, the relay no energized, so the daytime running light system dose not operated.
If the parking brake lever is then released (Parking Brake SW Off), the signal is input to TERMINAL A-2 of the integration relay.
This activates the relay, current from Main fuse flows to daytime running light relay No.2 (Point Side) --> Head (LH-UPR) --> fuse Headlight (HI-LH) --> Headlight (HI-RH) --> Daytime running light relay No.3 --> Ground, so both tail and head light up.
Once the daytime running light system operates and head light up. head remain on even if the parking brake lever is pulled up (Parking Brake SW ON).
Even if the Engine stalls with the Ignition SW ON and there is no voltage from TERMINAL 'L' of generator (Alternator). Head remain ON. If the Ignition SW is then turned OFF, Head are turned Off.
If the Engine is started while the parking brake lever released (Parking Brake SW Off), the Daytime running light system operates and Head light up as the Engine starts.

2. TAILLIGHT OPERATION
When the light control SW is turned to the Tail position, current flowing to the taillight relay (Coil Side) always flows to TERMINAL A-11 of the integration relay --> TERMINAL A-10 --> TERMINAL 3 of the light control SW -->TERMINAL 4 --> Ground, turning the Taillight relay ON.
This causes the current flowing to the Taillight relay (Point Side) to flow from the Taillight relay --> Tail fuse --> Tail, license and front clearance lights --> Ground, and from Taillight relay --> Panel fuse --> integration relay -->TERMINAL (a)5 of the integration relay --> illumination lights --> Ground, causing the Taillights and Illumination lights to light up.

3. HEADLIGHT OPERATION
When the light control SW is to Head position and Dimmer SW to low position, the current flowing to the headlight relay (Coil Side) flows to diode --> TERMINAL A-12 of the integration relay --> TERMINAL A-13 --> TERMINAL 13 of the light control SW --> TERMINAL 4 --> Ground, turning the Headlight relay ON.
This causes the current flowing to the Headlight relay (Point Side) --> DRL fuse --> Daytime Running Right relay NO.3 --> Ground, turning the daytime running light relay NO.3 ON. Also, current from the Headlight relay (Point Side) --> Head (LWR) fuses --> Headlights (LO) --> Ground, so the Headlight (LOW) Light up.
When the Dimmer SW is turned to high position, current flows from daytime running light relay NO.2 (Coil Side) --> TERMINAL A-9 of the integration relay --> TERMINAL A-8 --> TERMINAL 9 of the Dimmer SW --> TERMINAL 18 --> Ground, turning the Daytime Running Light relay NO.2 ON.
This causes the current flowing to daytime running light relay NO.2 (Point Side) --> Head (UPR) fuses --> Headlight (HI) --> Ground, causing the Headlights (HI) to light up.
When the Dimmer SW is turned to Flash position, current flows from TERMINALS A-12 and A-9 of the integration relay --> TERMINAL A-7 and A-8 --> TERMINALS 7 and 9 of the Dimmer SW --> TERMINAL 18 --> Ground, so that the Headlight relay and Daytime Running Light relay NO.2 are activates.
This causes the current flowing to Headlight Relay (Point Side) --> Head (LWR) fuses --> Headlights (LO) --> Ground, and from daytime running light relay NO.2 (Point Side) --> Head (UPR)fuses --> Headlights (HI) --> Ground, so the Headlights (LO and HI) light up.