Headlamp: Description and Operation

Voltage is always applied from the MAIN fuse, through the HEAD relay (Coil side) to TERMINAL 5 of the daytime running light relay (Main), TERMINAL 3 of light auto cut relay (Integration relay), TERMINAL 8 of dimmer SW, through DRL NO.2 relay (Coil side), to TERMINAL 17 of the daytime running light relay (Main). When the ignition SW is turned ON, voltage from the GAUGE fuse is applied to TERMINAL 2 of the daytime running light relay (Main).

1. DAYTIME RUNNING LIGHT OPERATION
When the engine starts, voltage from 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 and the daytime running light do not operate.
When the parking brake is released (Parking brake SW OFF), a signal is output from TERMINAL 1 of the parking brake SW to TERMINAL 8 of the daytime running light relay (Main). This activates the daytime running light relay (Main), turning on the DRL NO.2 relay. Current also flows from the MAIN fuse to DRL NO.2 relay (Point side) to HEAD HI (LH) fuse to headlight HI LH to headlight HI LH to headlight HI RH to TERMINAL 1 of DRL NO.3 relay to TERMINAL 4 to GROUND, causing the headlights to light up at half their normal brightness.
Once the daytime running light relay (Main) has been activated and the headlights light up, the headlights remain on even if the parking brake lever is engaged again (Parking brake SW ON).

2. HEADLIGHT OPERATION
When the light control SW is at HEAD position and the dimmer SW at LOW position, current flows from the HEAD relay (Coil side) to TERMINAL 3 of the light auto out relay (Integration relay) to TERMINAL 4 to TERMINAL 13 of light control SW to TERMINAL 16 to GROUND, activating the HEAD relay.
This causes current to flow from the HEAD relay (Point side) to the HEAD LO fuse to headlight LO to GROUND, causing the headlight to light up at normal brightness. Simultaneously, current flows from the DRL fuse to DRL NO.3 relay (Coil side) to GROUND, activating relay NO.3.
When the dimmer SW is at HIGH position, TERMINAL 7 of the dimmer SW outputs a signal to TERMINAL 16 of the daytime running light relay (Main) to activate it. This turns on DRL NO.2 relay. So current flows from DRL NO.2 relay (Point side) to the HEAD HI (LH) fuse to headlight HI LH to DRL NO.4 relay (Point side) to GROUND, and from the HEAD HI (RH) fuse to DRL NO.3 relay (Point side) to headlight HI RH to DRL NO.4 relay (Point side) to GROUND, causing the headlights to operate at HI.
When the dimmer SW is at FLASH position, current from the HEAD relay (Coil side) flows to TERMINAL 8 of the dimmer SW to TERMINAL 16 to GROUND, activating the relay. Simultaneously, current from the HEAD relay (Point side) flows to headlight LO, lighting up headlight LO and activating DRL NO.3 relay. Then TERMINAL 7 of the dimmer SW outputs a signal to TERMINAL 16 of the daytime running light relay (Main), activating the daytime running light relay (Main) so that current flows to headlight HI like it does for HIGH position. This causes all headlights to light up.