Headlamp: Description and Operation

Voltage from the battery is always applied through the MAIN fuse to the HEAD relay (Coil side), furthermore, to TERMINAL 6 of the daytime running light relay (Main).

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage generated at TERMINAL 1 of the generator is applied to TERMINAL 14 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 is released (Parking brake SW OFF), a signal is input to TERMINAL 5 of the relay.

This activates the relay, so current flows from the MAIN fuse to the HEAD relay (Point side) to TERMINAL 1 of the DIM relay to TERMINAL 4 to H-LP LH (LWR), H-LP RH (LWR) fuse to TERMINAL 1 of the headlights to TERMINAL 3 to TERMINALS 1 or 7 of the daytime running light relay (Main) to GROUND to TERMINAL 2 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 pedal is depressed (Parking brake SW ON).

If the engine stalls and the ignition SW remains ON, the headlights remain ON even through 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 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 , current flows from the DRL fuse to TERMINAL 3 of the DRL NO.4 relay to TERMINAL 4 to TERMINAL 1 of the diode (Daytime running light no. 2) to TERMINAL 2 to the integration relay to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND, activating the DRL NO.4 relay. Current then flows from the H-LP LH (LWR), H-LP RH (LWR) fuse to TERMINAL 1 of the headlights to TERMINAL 3 to TERMINAL 1 of the DRL NO.4 relay to TERMINAL 2 to GROUND, causing the headlights to light up at normal intensity.

When the dimmer SW is switched to the HIGH position, 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 DIM relay to TERMINAL 3 to TERMINAL 9 of the daytime running light relay (Main), activating the DIM relay. This causes current to flow from TERMINAL 1 of the DIM relay to TERMINAL 2 to HEAD LH, HEAD RH fuse to TERMINAL 2 of the headlights to TERMINAL 3 to TERMINAL 1 of the DRL NO.4 relay to TERMINAL 2 to GROUND, causing the headlights to light up at high beam and the high beam indicator to light up.

When the dimmer SW is switched to FLASH position, the daytime running light relay (Main) is activated, the current flowing from the HEAD relay (Point side) flows the DRL fuse to TERMINAL 3 of the DRL NO.4 relay to TERMINAL 4 to TERMINAL 1 of the diode (Daytime running light no. 2) to TERMINAL 2 to TERMINAL 8 of the dimmer SW to TERMINAL 16 to GROUND, and the current flowing from the HEAD relay (Point side) also flows through the HEAD LH, HEAD RH fuse to TERMINAL 2 of the headlights to TERMINAL 3 to TERMINAL 1 of the DRL NO.4 relay to TERMINAL 2 to GROUND, causing the headlights to light up at high beam and the high beam indicator to light up.