Headlamp: Description and Operation
1. DAYTIME RUNNING LIGHT OPERATIONWhen 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 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 8 of the Relay.
This activates the Relay, so current flows from FL MAIN to the Head Relay (Point Side) --> DIMMER Fuse --> TERMINAL 1 of the Dimmer Relay --> TERMINAL 4 --> HEAD LH-LWR), (RH-LWR) Fuse --> TERMINAL 1 of the Headlights --> TERMINAL 3 --> TERMINAL 1 of the Daytime Running Light Resistor --> TERMINAL 2 --> GROUND, causing the Headlights to light up (Headlights light up dimmer than normal brightness). Once the daytime running light system operates and headlights light UP, headlight 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 though current is no longer output from TERMINAL 1 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 Headlight Light up when the Engine starts.
2. HEADLIGHT OPERATION
When the light control SW is switched to HEAD position, current flows from the DRL Fuse --> TERMINAL 3 of DRL No.4 Relay --> TERMINAL 4 --> TERMINAL 2 of Diode (Daytime Running Light System) --> TERMINAL 3 --> TERMINAL 13 of Light Control SW --> TERMINAL 16 --> GROUND, activating DRL No. 4 Relay. Current then flows from the HEAD (LH-LWR), (RH-LWR) Fuse to TERMINAL 1 of the Headlights --> TERMINAL 3 --> TERMINAL 1 of DRL No. 4 Relay --> TERMINAL 2 --> GROUND, causing the Headlights to Light Up at normal intensity.
When the Dimmer SW is switched to the High side, the signal from the Dimmer SW is input to the Daytime Running Light Relay. This activates the Relay and current flows from TERMINAL 1 of the Dimmer Relay --> TERMINAL 3 --> TERMINAL 17 of the Daytime Running Light Relay (Main), activating the Dimmer Relay. This causes current to flow from TERMINAL 1 of the Dimmer Relay --> TERMINAL 2 --> HEAD (LH-UPR), (RH-UPR) Fuse --> TERMINALS 2 of Headlights --> TERMINAL 3 --> TERMINAL 1 of DRL No. 4 Relay --> TERMINAL 2 --> GROUND, causing the Headlights to light up at High Beam.
When the Dimmer SW is at FLASH position, the Daytime Running Light Relay is activated and current from Dimmer Fuse flows through the DRL Fuse to TERMINAL 3 of the DRL No. 4 Relay --> TERMINAL 4 --> TERMINAL 2 of Diode (Daytime Running Light System) --> TERMINAL 1 --> TERMINAL 8 of the Dimmer SW --> TERMINAL 16 --> GROUND. Then the current from the DIMMER fuse also flows to TERMINAL 1 of the Dimmer Relay --> TERMINAL 2 --> TERMINAL 1 of the HEAD (LH-UPR), (RH-UPR) Fuse --> TERMINAL 2 --> TERMINAL 2 of the Headlights --> TERMINAL 3 --> TERMINAL 1 of DRL No. 4 Relay --> TERMINAL 2 --> GROUND, causing the headlights to light UP at high beam.