Fog/Driving Lamp: Description and Operation

The current from the battery is always flowing from the MAIN fuse to HEAD LP relay (Coil side) to TERMINAL 2 of the daytime running light relay (Main) and TERMINAL 9 of the dimmer SW, HEAD LP relay (Coil side) to TERMINAL 8 of the body ECU to TERMINAL 7 to TERMINAL 14 of the light control SW, MAIN fuse to DRL NO.2 relay (Coil side) to TERMINAL 9 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 5 of the daytime running light relay (Main).
If the parking brake pedal is depressed (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 is released (Parking brake SW off), the signal is input to TERMINAL 4 of the relay. This activates the relay and current from MAIN fuse flows to DRL NO.2 relay (Point side) to H-LP L UPR fuse to TERMINAL 1 of the headlight LH (High beam) to TERMINAL 2 to TERMINAL 2 of the headlight RH(High beam) to TERMINAL 1 to TERMINAL (A) 5 of the daytime running light relay No.3 to TERMINAL (A) 3 to GROUND, causing the headlights to light up dimmer than normal brightness.
Once the daytime running light system has been activated, the headlights remain lit even though the parking brake pedal is depressed (The parking brake SW is on). Even if the engine is stopped and the generator signal is cut off with the ignition SW set at ON, the headlights remain lit. When the ignition SW is turned from ON to OFF, the daytime running light system is stopped and the headlights go off. If the engine is started with the parking brake pedal released, the daytime running light system starts functioning and the headlights light up as the engine is started.

2. HEADLIGHT OPERATION
* When the light control SW is at HEAD position
When the light control SW is set to HEAD position, the current flowing to the HEAD LP relay (Coil side) flows to TERMINAL 8 of the body ECU to TERMINAL 7 to TERMINAL 14 of the light control SW to TERMINAL 16 to GROUND, turning the HEAD LP relay on.
This causes the current to flow to the HEAD LP relay (Point side) to H-LP L, R LWR fuses to TERMINAL 2 of the headlight control ECU LH, RH (Low beam) [w/ HID] or headlight LH, RH (Low beam) [w/o HID] to TERMINAL 1 to GROUND, so the headlight control ECU LH, RH (Low beam) [W/ HID] or headlight LH, RH (Low beam) [w/o HID] light up.
* Dimmer SW at FLASH position
When the dimmer SW is set to FLASH position, current flows from HEAD LP relay (Coil side) to TERMINAL 9 of the dimmer SW to TERMINAL 17 to GROUND, turning the HEAD LP relay on. At this time, TERMINAL 8 of the dimmer SW outputs a signal to TERMINAL 8 of the daytime running light relay to activate it.
This turns on the DRL NO.2 relay, so the current flows from the DRL NO.2 relay (Point side) to the H-LP L UPR fuse to the headlight LH (High beam) to the daytime running light relay No.4 (Point side) to GROUND, and from the H-LP R UPR fuse to the daytime running light relay No.3 (Point side) to the headlight RH (High beam) to the daytime running light relay No.4 (Point side) to GROUND, causing the headlights to operate at HI.
Then the current from daytime running light relay No.3 (Point side) flows to TERMINAL 4 of the high beam indicator light to TERMINAL 3 to GROUND, causing the indicator to light up.
* Dimmer SW at HIGH position
When the light control SW is set to HEAD position, current flows from HEAD LP relay (Coil side) to TERMINAL 8 of the body ECU to TERMINAL 7 to TERMINAL 14 of the light control SW to TERMINAL 16 to GROUND, turning HEAD LP relay on. When the dimmer SW is set to HIGH position, the current to the headlights flows as the FLASH operation, causing the headlights to light up.