This is a riddle that's brought up from time to time - How to enable running the fog light without the headlight being on, with the factory fog light switch.
Factory logic, allows fogs to function only when the headlight is on. I'd like to turn them on independently at times. I've made this mod previously with an IS300 by jumpering some wires, but haven't had time to sort a solution on the 200-series yet.
Leveraging the hive mind here to give this deeper thought.
Seeding this with the following. If I'm reading this correctly...
Assumptions:
1) Fog light switch on the steering column pulls FFOG (plug E2, pin 28) on the main body ECU down to ground as the turn on signal.
2) FFGO (plug E1, pin 4) on main body ECU pulls FR FOG Relay (pin 1) down to ground to turn on the relay and power the fog light on
I believe the fog on logic with headlight only is within the Main Body ECU
CAUTION!!! HIVE MIND, PLEASE ASSESS WHAT I'M SUGGESTING BEFORE ANYONE PHYSICALLY PERFORMS THIS MOD AND BREAKS SOMETHING.
Mod:
EDIT - Recommended solution here
3) Jumpering the circled pins may bypass the fog with headlight on logic in the main body ECU? Allowing the fog light switch on the stalk to directly pull down FR FOG Relay to ground, and turning on the fog?
*Ignore gray block on rear fogs as that's for international spec 200-series.
Factory logic, allows fogs to function only when the headlight is on. I'd like to turn them on independently at times. I've made this mod previously with an IS300 by jumpering some wires, but haven't had time to sort a solution on the 200-series yet.
Leveraging the hive mind here to give this deeper thought.
Seeding this with the following. If I'm reading this correctly...
Assumptions:
1) Fog light switch on the steering column pulls FFOG (plug E2, pin 28) on the main body ECU down to ground as the turn on signal.
2) FFGO (plug E1, pin 4) on main body ECU pulls FR FOG Relay (pin 1) down to ground to turn on the relay and power the fog light on
I believe the fog on logic with headlight only is within the Main Body ECU
CAUTION!!! HIVE MIND, PLEASE ASSESS WHAT I'M SUGGESTING BEFORE ANYONE PHYSICALLY PERFORMS THIS MOD AND BREAKS SOMETHING.
Mod:
EDIT - Recommended solution here
3) Jumpering the circled pins may bypass the fog with headlight on logic in the main body ECU? Allowing the fog light switch on the stalk to directly pull down FR FOG Relay to ground, and turning on the fog?
*Ignore gray block on rear fogs as that's for international spec 200-series.
Last edited: