Headlamp: Description and Operation

Current from the battery is always flowing from ALT fuse --> Taillight Relay (Coil side) --> TERMINAL 11 of Light Control SW (Comb. SW), battery --> Head Relay (coil side) --> TERMINAL 6 of the Daytime Running Light Relay (Main), and ECU-B fuse --> TERMINAL 15 of the Daytime Running Light Relay (Main).

When the Ignition SW is turned ON, the current flows through the GAUGE fuse to TERMINAL 2 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 11 of the Daytime Running Light Relay.

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 ALT fuse to Taillight Relay (Point side) --> TAIL Fuse --> Tail, license, parking lights --> GROUND, causing the taillight to light up. Also, current flows from battery to the head Relay (point side) --> TERMINAL 1 of the dimmer Relay --> TERMINAL 4 --> HEAD (LH-LO), (RH-LO) fuse --> TERMINAL 1 of headlights --> TERMINAL 3 --> TERMINAL 1 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 headlights light up, 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, headlights remain light up even though 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
During Daytime Running Light operation, the headlights are ON 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 Daytime Running Light Relay no.4 --> TERMINAL 3 --> TERMINAL 1 of diode no.1 --> TERMINAL 2 --> TERMINAL 4 of light control SW (Comb. SW) --> TERMINAL 10 --> GROUND, activating Daytime Running Light Relay no.2 current then flows from the HEAD (LH-LO), (RH-LO) fuse to TERMINAL 1 of the headlights --> TERMINAL 3 --> TERMINAL 1 of Daytime Running Light Relay no.4 --> TERMINAL 2 --> GROUND, causing the headlights to light up at normal intensity.

When the dimmer SW (Comb. SW) is switched to the HIGH side, the signal from the dimmer SW [Comb. 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 1 of the Daytime Running Light Relay (main), activating the dimmer Relay.

This causes current flowing from TERMINAL 1 of the dimmer Relay --> TERMINAL 2 --> HEAD (LH-HI), (RH-HI) fuse --> TERMINAL 2 of headlights --> TERMINAL 3 --> TERMINAL 1 of Daytime Running Light Relay no.4 --> TERMINAL 2 --> GROUND, causing the headlights to light up at high beam.

When the dimmer SW (Comb. 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 --> TERMINAL 4 of Daytime Running Light Relay no.4 --> TERMINAL 3 --> TERMINAL 1 of diode no.1 --> TERMINAL 2 --> TERMINAL 1 of diode no.2 --> TERMINAL 2 --> TERMINAL 12 of dimmer SW (Comb. SW) --> TERMINAL 13 --> GROUND, and also flows from the HEAD (LH-HI), (RH-HI) fuse --> TERMINAL 2 of headlights --> TERMINAL 3 --> TERMINAL 1 of Daytime Running Light Relay no.4 --> TERMINAL 2 --> GROUND, causing the high beam to operate.

When the headlights operate (except for flashing mode), the taillights also operate as described in part 2.