Headlight (W/ Daytime Running Light)

Current from the battery is always flowing from the FL MAIN to MAIN fuse to HEAD relay (Coil side) to TERMINAL B 4 of the integration relay to TERMINAL B 5 to TERMINAL 13 of the light control SW and TERMINAL 8 of the dimmer SW, FL MAIN to MAIN fuse to DRL NO.2 relay (Coil side) to TERMINAL B 1 of the integration relay.

1. DAYTIME RUNNING LIGHT OPERATION
When the engine is started, voltage generated at TERMINAL L of the generator is applied to TERMINAL A 8 of the integration relay.
If the parking brake pedal is depressed (Parking brake SW ON) at this time, the relay is not energized, so the daytime running light system does not operate. If the parking pedal lever is released (Parking brake SW OFF), the signal is input to TERMINAL A 22 of the integration relay. This activates the integration relay and current from MAIN fuse flows to DRL NO.2 relay (Point side) to HEAD LH (UPR) fuse to TERMINAL 2 of the headlight control ECU LH (High) [HID type] to TERMINAL 1 or TERMINAL 1 of the headlight LH (High) [Except HID type] to TERMINAL 1 (HID type) or TERMINAL 2 (Except HID type) to TERMINAL 1 of the headlight control ECU RH (High) [HID type] or TERMINAL 2 of the headlight RH (High) [Except HID type] to TERMINAL 2 (HID type) or TERMINAL 1 (Except HID type) to TERMINAL 3 of the DRL NO.3 relay to TERMINAL 4 to GROUND, causing the headlights to light up dimmer than normal brightness.
This is how the daytime running light system operates once the daytime running light system operates and the headlights have light up, the headlights remain ON even if the parking brake pedal is depressed (Parking brake SW ON).
Even if the engine stalls with the ignition SW ON and there is no voltage from TERMINAL L of the generator, the headlights remain ON. If the ignition SW is then turned OFF, headlights are turned OFF.
If the engine is started while the parking brake pedal is released (Parking brake SW OFF), the daytime running light system operates and the headlights light up as the engine starts.

2. HEADLIGHT OPERATION
* When the light control SW at the HEAD position
When the light control SW is set to HEAD position, the current flowing to the HEAD relay (Coil side) flows to TERMINAL B 4 of the integration relay to TERMINAL B 5 to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND, turning the HEAD relay ON.
This causes the current flowing to the HEAD relay (Point side) to DRL NO.2 fuse to DRL NO.3 relay (Coil side) and DRL NO.4 relay (Coil side) to GROUND, turning the DRL NO.3 and NO.4 relay ON. also, current from the HEAD relay (Point side) to H-LP (LWR) fuses to TERMINAL 2 of the headlight control ECUs (Low) [HID type] or headlights (Low) [Except HID type] to TERMINAL 1 (HID type) or TERMINAL 3 (Except HID type) to GROUND, so the headlights (Low side) light up.

* Dimmer SW at FLASH position
When the dimmer SW is set to FLASH position, current flows from HEAD relay (Coil side) to TERMINAL 8 of the dimmer SW to TERMINAL 16 to GROUND, turning the HEAD relay ON. At the same time, signals are output from TERMINAL 7 of the dimmer SW to TERMINAL A 14 of the integration relay, activating the integration relay and also the DRL NO.2 relay. When the HEAD relay and integration relay are activated, the headlights (Low and high) then light up.

* Dimmer SW at HIGH position
When the light control SW is set to HEAD position, a signal is output from TERMINAL B 5 of the integration relay to TERMINAL 13 of the light control SW to TERMINAL 16 to GROUND.
When the dimmer SW is set to HIGH position, these signals activate DRL NO.2 relay, so current flows from DRL NO.2 relay (Point side) to HEAD LH (UPR) fuse to TERMINAL 2 of the headlight control ECU LH (High) [HID type] or TERMINAL 1 of the headlight LH (High) [Except HID type] to TERMINAL 1 (HID type) or TERMINAL 2 (Except HID type) to DRL NO.4 relay (Point side) to GROUND, and current also simultaneously flows from HEAD RH (UPR) fuse to DRL NO.3 relay (Point side) to TERMINAL 2 of the headlight control ECU RH (High) [HID type] or TERMINAL 1 of the headlight RH (High) [Except HID type] to TERMINAL 1 (HID type) or TERMINAL 2 (Except HID type) to DRL NO.4 relay (Point side) to GROUND, causing the headlights (High side) to light up.

3. AUTOMATIC LIGHT CONTROL OPERATION
When the daytime running light is operating and the automatic light control sensor detects a decrease in the ambient light (It continues less than approx. 2500 lux over about 20 seconds, and it is less than 1000 lux.), the automatic light control operation starts. At the same time integration relay is activated, so current flows from the ALT fuse to the taillight relay (Coil side) to TERMINAL B 3 of the integration relay, and the DRL NO.2 fuse to the DRL NO.4 relay (Coil side) to GROUND, activating both the taillight relay and the DRL NO.4 relay, so that the taillights and headlights light up.
When the light control sensor detects an increase in the ambient light (It continues more than approx. 1000 lux over about 20 seconds, and it is more than 2500 lux), the ignition SW is turned to OFF, the light control SW is turned to HEAD position, and the automatic light control operation stop.