Fog/Driving Lamp: Description and Operation

Current from the battery is always flowing from the MAIN fuse --> Head LP relay (coil side) --> TERMINAL 5 of the daytime running light relay (main) and TERMINAL 9 of the dimmer SW (comb. SW), head LP relay (coil side) --> TERMINAL 8 of the body ECU --> TERMINAL 7 --> TERMINAL 14 of the light control SW (Comb. SW), main fuse --> DRL No.2 relay (coil side) --> TERMINAL 17 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 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 energized, so the daytime running light system does not operate. If the parking brake lever is released (parking brake lever SW OFF), the signal is input to TERMINAL 8 of the relay. This activates the relay and current from MAIN fuse flows to DRL No.2 relay (point side) H-LP L UPR fuse --> TERMINAL 2 of the headlight LH (high beam) --> TERMINAL 1 --> TERMINAL 1 of the headlight RH (high beam) --> TERMINAL 2 --> TERMINAL A-5 of the daytime running light relay No.3 --> TERMINAL A-3 --> to GROUND, causing the headlights to light up dimmer than normal brightness.

This is how the daytime running light system operates once it is activated and the headlights have lit up, the headlights remain ON even if the parking brake lever is pulled up (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 lever 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 (comb. SW) is at the Head Position
When the light control SW (comb. SW) is set to head position, the current flowing to the head LP relay (coil side) flows to TERMINAL 8 of the body ECU --> TERMINAL 7 --> TERMINAL 14 of the light control SW (comb. SW) --> TERMINAL 16 --> GROUND, turning the headlight relay ON.

This causes the current to flow to the head LP relay (point side) --> H-LP LH, RH fuse --> TERMINAL 3 of the headlights (low and high beam) --> TERMINAL 1 --> TERMINAL 18 of the dimmer SW (comb. SW) --> TERMINAL 17 --> GROUND, so the headlights (low beam) light up.

^ Dimmer SW (comb. SW) at Flash Position
When the dimmer SW (comb. SW) is set to flash position, current flows from head LP relay (coil side) --> TERMINAL 9 of the dimmer SW (comb. SW) --> TERMINAL 17 --> GROUND, turning the head LP relay ON. At this time current flows to the head LP relay (point side) H-LP LH, RH fuses --> TERMINAL 3 of the headlights (low and high beam) --> TERMINAL 2 --> TERMINAL 8 of the dimmer SW (comb. SW) --> TERMINAL 17 --> GROUND. The current through TERMINAL 3 of the headlights (low and high beam) also flows to TERMINAL 1 --> TERMINAL A-8 of the high beam indicator light (comb. meter) --> TERMINAL B-8 --> GROUND, causing the headlights (low and high beam) to light up.

^ Dimmer SW (comb. SW) at High Position
When the light control SW (comb. SW) is set to head position, current flows from head LP relay (coil side) --> TERMINAL 8 of the body ECU --> TERMINAL 7 --> TERMINAL 14 of the light control SW (comb. SW) --> TERMINAL 16 --> GROUND, turning head LP relay ON. When the dimmer SW (comb. SW) is set to HIGH position, the current flows to the head LP relay (point side) H-LP LH, RH fuses --> TERMINAL 3 of the headlights (low and high beam) --> TERMINAL 2 --> TERMINAL 8 of the dimmer SW (comb. SW) --> TERMINAL 17 --> GROUND. The current through TERMINAL 3 of the headlights (low and high beam) also flows to TERMINAL 1 --> TERMINAL A-8 of the high beam indicator light (comb. meter) --> TERMINAL B-8 --> GROUND, causing the headlights (low and high beam) to light up.