Headlamp: Description and Operation

Headlight (W/Daytime Running Light)

SYSTEM OUTLINE
The current is always flowing from the ECU-B fuse to TERMINAL 3 of the daytime running light relay (Main).

When the ignition SW is turned on, the current flowing through the GAUGE fuse flows to TERMINAL 12 of the daytime running light relay (Main).

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage generated at TERMINAL L of 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 11 of the relay.

This activates the daytime running light relay (Main), so the current flows from the H-LP LH and H-LP RH fuses to TERMINAL 3 of the headlights to TERMINAL 1 to TERMINAL 1 of the daytime running light relay (Main) 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 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 the light control SW is input to TERMINAL 7 of the daytime running light relay (Main), activating the daytime running light relay (Main). This causes the current flows from the H-LP LH and H-LP RH fuses to TERMINAL 3 of the headlights to TERMINAL 1 to TERMINAL 8 of the combination SW to TERMINAL 11 to GROUND, causing the headlights to light up at normal intensity.

When the light control SW is switched to HEAD position and the dimmer SW is set to HIGH position, the signal from the light control SW is input to TERMINAL 7 of the daytime running light relay (Main). This activates the daytime running light relay (Main) and the DRL NO.5 relay is turned on, so the current flows from the H-LP LH fuse to DRL NO.5 relay (Coil side) to TERMINAL 9 of the combination SW to TERMINAL 11 to GROUND. This causes the current flows from the H-LP LH and H-LP RH fuses to TERMINAL 3 of the headlights to TERMINAL 2 to TERMINAL 9 of the combination SW to TERMINAL 11 to GROUND. At the same time, the current flows from the DOME fuse to TERMINAL (B) 1 of the combination meter to TERMINAL (B) 4 to TERMINAL 9 of the combination SW to TERMINAL 11 to GROUND, causing the headlights to light up at high beam and the high beam indicator light to light up.

When the dimmer SW is switched to FLASH position, the DRL NO.5 relay is turned on, so the signal is input to TERMINAL 7 of the daytime running light relay (Main), and this activates the daytime running light relay (Main). This causes the current flows from the H-LP LH and H-LP RH fuses to TERMINAL 3 of the headlights to TERMINAL 2 to TERMINAL 9 of the combination SW to TERMINAL 11 to GROUND. At the same time, the current flows from the DOME fuse to TERMINAL (B) 1 of the combination meter to TERMINAL (B) 4 to TERMINAL 9 of the combination SW to TERMINAL 11 to GROUND, causing the headlights to light up at high beam and the high beam indicator light to light up.