Headlamp: Description and Operation

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage at TERMINAL 'L' of the Generator (Alternator) is applied to TERMINAL 11 of the Daytime Running Light Relay (Main).

If the parking brake pedal is depressed (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 pedal 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 ALT to the Taillight Relay (point side) --> TAIL fuse --> Tail, License, Clearance light --> GROUND, causing the Taillight to light Up. Also, current flows from FL main to the Headlight Relay (point side) --> TERMINAL 1 of the Dimmer Relay --> TERMINAL 4 --> HEAD (LH-LWR), (RH-LWR) fuse --> TERMINAL 2 of headlight --> TERMINAL 3 of Daytime Running Light Resistor --> TERMINAL 2 --> GROUND, causing the headlights to light up at 80%-85% of their normal brightness.

Once the daytime running light system operates and Tail and Headlight light UP, Tail and Headlight remain ON even if the parking brake pedal is depressed (parking brake SW ON).

If the engine stalls and the Ignition SW remains ON, Tail and Headlight remain lit up even through current is not longer output from TERMINAL 'L' of the Generator (Alternator). If the Ignition SW then turned OFF, the Tail and Head go OFF.

If the engine is started with the parking brake pedal released (parking brake SW OFF, the daytime running light system operates and tail and headlight light up when the engine starts.

2. TAILLIGHT OPERATION
During daytime running light operation, the Tail, Head and Clearance light are always ON.

When the light control SW (Comb. SW] is switched to TAIL position, the current flowing constantly from the Taillight Relay (Coil side) to TERMINAL 4 of the Daytime Running Light Relay (Main) then flows to TERMINAL 3 --> TERMINAL 4 of the Integration Relay --> TERMINAL 3 --> TERMINAL C-2 of the Light Control SW (Comb. SW) --> TERMINAL C-11 --> GROUND. When this occurs, current flow to the Daytime Running Light Relay (Main) causes the current flowing from the Taillight Relay (Point side) to the PANEL fuse to flow from the PANEL Fuse to TERMINAL 10 of the Daytime Running Light Relay (Main) --> TERMINAL 9 --> Illumination --> GROUND, causing the Illumination to light UP.


3. HEADLIGHT OPERATION
During Daytime Running Light operation, the Headlight are constantly at 80%-85% normal intensity.

When the Light Control SW [Comb. SW] is switched to HEAD position, current flows from the DRL Fuse --> TERMINAL 4 of the Daytime Running Light Relay no.2 --> TERMINAL 3 --> TERMINAL 2 of the Diode --> TERMINAL 1 --> TERMINAL 5 of the Integration Relay --> TERMINAL 6 --> TERMINAL C-13 of the Light Control SW [Comb. SW] --> TERMINAL C-11 --> GROUND, activating Daytime Running Light Relay no.2 current then flows from the HEAD (LH-LWR), (RH-LWR) Fuse to TERMINAL 2 of the Headlight --> TERMINAL 3 --> TERMINAL 2 of the Daytime Running Light Relay no.2 --> TERMINAL 1 --> GROUND, causing the Headlight to light up at normal intensity.

When the Dimmer SW [Comb. SW] is switched to the high side, the signal from the Dimmer SW is input to the Daytime Running Light Relay (Main). 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 --> TERMINAL 1 of headlight --> TERMINAL 3 --> TERMINAL 2 of the Daytime Running Light Relay no.2 --> TERMINAL 1 --> GROUND, causing the headlight to light up at high beam.

When the Dimmer SW is switched to FLASH position, the Daytime Running Light Relay (Main) is activated and current flows from TERMINAL 1 of the Dimmer Relay to TERMINAL 2. Current from the DRL fuse flows from TERMINAL 4 of the Daytime Running Light Relay no.2 --> TERMINAL 3 --> TERMINAL 2 of the diode --> TERMINAL 3 --> TERMINAL B-11 of the Dimmer SW [Comb. SW] --> TERMINAL B-9 --> GROUND, and also flows from HEAD (LH-UPR), (RH-UPR) fuse --> TERMINAL 1 of headlight --> TERMINAL 3 --> TERMINAL 2 of the Daytime Running Light Relay no.2 --> TERMINAL 1 --> GROUND, causing the high beam to operate.

When the headlight operate (except for flashing mode), the taillight also operate as described in parts 2.