Headlamp: Description and Operation

Current from the battery is always flowing from MAIN fuse --> headlight relay (coil side) --> TERMINAL 6 of daytime running right relay (main), and ALT fuse --> ECU-B fuse --> TERMINAL 15 of daytime running light relay (main). When the ignition SW is turned ON, the current flowing through the GAUGE fuse flows to TERMINAL 2 of the daytime running right relay (main).

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage generated at TERMINAL L of the generator (alternator) 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 8 of the relay.
This activates the relay, so current flows from main fuse to the headlight relay (point side) --> TERMINAL 1 of the dimmer relay --> TERMINAL 4 --> HEAD (LH-LWR), (RH-LWR) fuse --> TERMINAL 1 of headlights --> TERMINAL 3 --> TERMINAL 1 of daytime running light resister --> TERMINAL 2 --> GROUND, causing the headlights to light up at 80% - 85% of their normal brightness.
Once the daytime running light system operates and headlight light up, headlight 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, headlight remain light up even through current is no longer output from TERMINAL L of the generator (alternator). If the IG SW is then turned OFF, the head go OFF.
If the engine is started with the parking brake lever released (parking brake SW OFF), the daytime running light system operates and headlight 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 headlight relay (point side) --> TERMINAL 1 of daytime running light relay No.2 --> TERMINAL 3 --> TERMINAL 2 of the diode --> TERMINAL 3 --> TERMINAL 6 of the light retainer relay --> TERMINAL 14 --> TERMINAL 13 of light control SW --> TERMINAL 11 --> GROUND, activating daytime running light relay No.2. current then flows from the HEAD (LH-LWR), (RH-LWR) fuse to TERMINAL 1 of the headlights --> TERMINAL 3 --> TERMINAL 5 of daytime running light relay No.2 --> TERMINAL 4 --> 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 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 17 of the daytime running light relay (main), activating the dimmer relay.
This causes current to flows from TERMINAL 1 of the dimmer relay --> TERMINAL 2 of dimmer relay --> HEAD (LH-UPR), (RH-UPR) fuse --> TERMINAL 2 of headlights --> TERMINAL 3 --> TERMINAL 5 of daytime running light relay No.2 --> TERMINAL 4 --> 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 headlight relay (point side) flows from TERMINAL 1 of the daytime running light relay No.2 --> TERMINAL 3 --> TERMINAL 2 of diode --> TERMINAL 1 --> TERMINAL 14 of dimmer SW (comb. SW) --> TERMINAL 9 --> GROUND, and also flows from the HEAD (LH-UPR), (RH-UPR) fuse --> TERMINAL 2 of headlights --> TERMINAL 3 --> TERMINAL 5 of daytime running light relay No.2 --> TERMINAL 4 --> GROUND, causing the high beam to operate.
When the headlights operate (except for flashing mode), the taillights also operate as described in parts 2.