System Outline

Current is always flowing from the HEAD MAIN fuse to HEAD relay (Coil side) to TERMINAL 6 of the daytime running light relay, from the ECU-B fuse to TERMINAL 3 of the daytime running light relay and from the TAIL fuse to the TAIL relay (Coil side) to TERMINAL 14 of the daytime running light relay (USA).

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

1. Daytime Running Light Operation 

   When the engine is started, voltage generated at TERMINAL L of the generator is applied to TERMINAL 8 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 sent to TERMINAL 11 of the relay.

   This activates the daytime running light relay and the HEAD relay is turned on, so current flows from the HEAD MAIN fuse to the HEAD relay (Point side) then to the HEAD LH LWR and HEAD RH LWR fuses to TERMINAL 2 of the headlights, out TERMINAL 1 to TERMINAL 1 of the daytime running light relay then out TERMINAL 2 to GROUND, causing the headlights to light up (Headlights light up dimmer than normal brightness.). Once the daytime running light system is operating 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 lit 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 released (Parking brake SW off), the daytime running light system activates and headlights light up when the engine starts.

2. Headlight Operation 

   When the light control SW is switched to the HEAD position and the dimmer SW is set to the LOW position, the daytime running light relay and the HEAD relay turn on, and current flows from the HEAD MAIN fuse to the HEAD relay (Coil side) to TERMINAL 6 of the daytime running light relay and out TERMINAL 7 to TERMINAL 12 of the light control SW then finally out TERMINAL 11 to GROUND. The current to the HEAD relay (Point side) then flows to the HEAD LH LWR and HEAD RH LWR fuses to TERMINAL 2 of the headlights (Low), out TERMINAL 1 to TERMINAL 1 of the daytime running light relay and finally out TERMINAL 2 to GROUND, causing the headlights to light up at normal intensity.

   When the light control SW is switched to the HEAD position and the dimmer SW is set to the HIGH position, the signal from the dimmer SW is sent to the daytime running light relay. This activates the daytime running light relay and the HEAD relay is turned on, so current flows from the HEAD MAIN fuse to the HEAD relay (Point side) to TERMINAL 1 of the DIMMER relay, out TERMINAL 2 to TERMINAL 13 of the daytime running light relay, activating the DIMMER relay. This causes current to flow in TERMINAL 3 of the DIMMER relay out TERMINAL 5 to the HEAD LH UPR and HEAD RH UPR fuses to TERMINAL 2 of the headlights (High) and out TERMINAL 1 to GROUND, causing the headlights to light up on high beam, the high beam indicator light to light up.

   When the dimmer SW is switched to the FLASH position, the signal from the dimmer SW is sent to the daytime running light relay. This activates the daytime running light relay and the HEAD relay is turned on, so current flows from the HEAD MAIN fuse to the HEAD relay (Point side) to TERMINAL 1 of the DIMMER relay out TERMINAL 2 to TERMINAL 13 of the daytime running light relay, activating the DIMMER relay, and it also flows from the HEAD LH UPR and HEAD RH UPR fuses to TERMINAL 2 of the headlights and out TERMINAL 1 to GROUND, causing the headlights to light up on high beam and the high beam indicator light to light up.

3. Automatic Light Control Operation (USA) 

   When the daytime running lights are operating and the automatic control sensor detects a decrease in the ambient light, the automatic light control operation starts. At the same time, the daytime running light relay is activated, so current flows from the TAIL fuse to the TAIL relay (Coil side) to TERMINAL 14 of the daytime running light relay, and to the HEAD MAIN fuse to the HEAD relay (Coil side) to TEMRINAL 6 of the daytime running light relay, activating both the TAIL relay and the HEAD relay, so that the taillights and headlights light up.

   When the automatic light control sensor detects an increase in the ambient light, the ignition SW is turned to off, or the light control SW is turned to the HEAD position, then the automatic light control operation stops.