Headlamp: Description and Operation

Voltage from the battery is always applied through the ALT fuse to the taillight relay (Coil side) to TERMINAL 11 of the light control SW, battery to the HEAD relay (Coil side) to TERMINAL 6 of the daytime running light relay (Main), and ECU-B fuse to TERMINAL 15 of the daytime running light relay (Main).

When the ignition SW is turned ON, the current flows through the GAUGEfuse 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 (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 5 of the relay. This activates the relay, so current flows from battery to the HEAD relay (Point side) to TERMINAL 1 of the DIMMER relay to TERMINAL 4 to HEAD (LH-LO), (RH-LO) fuse to TERMINAL 1 of the headlights to TERMINAL 3 to TERMINAL 1 of the daytime running light resistor to TERMINAL 2 to 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 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
During daytime running light operation, the headlights are ON constantly to 80% - 85% normal intensity.

When the light control SW is switched to HEAD position, current flows from the DRL fuse to TERMINAL 4 of the daytime running light relay No. 4 to TERMINAL 3 to TERMINAL 1 of the diode No. 1 to TERMINAL 2 to TERMINAL 4 of the light control SW to TERMINAL 10 to GROUND, activating the daytime running light relay No. 4 current then flows from the HEAD (LH-LO), (RH-LO) fuse to TERMINAL 1 of the headlights to TERMINAL 3 to TERMINAL 1 of the daytime running light relay No. 4 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 DIMMER relay to TERMINAL 3 to TERMINAL 17 of the daytime running light relay (Main), activating the DIMMER relay.

This causes current flowing from TERMINAL 1 of the DIMMER relay to TERMINAL 2 to the HEAD (LH-HI),(RH-HI) fuse to TERMINAL 2 of the headlights to TERMINAL 3 to TERMINAL 1 of the daytime running light relay No. 4 to TERMINAL 2 to GROUND, causing the headlights 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 to TERMINAL 4 of the daytime running light relay No. 4 to TERMINAL 3 to TERMINAL 1 of the diode No. 1 to TERMINAL 2 to TERMINAL 1 of the diode No. 2 to TERMINAL 2 to TERMINAL 12 of the dimmer SW to TERMINAL 13 to GROUND, and also flows from the HEAD (LH-HI),(RH-HI) fuse to TERMINAL 2 of the headlights to TERMINAL 3 to TERMINAL 1 of the daytime running light relay No.4 to TERMINAL 2 to GROUND, causing the high beam to operate.

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