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foglight question.. [Archive] - Toyota MR2 Message Board

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foglight question.. [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota MR2 Generations > MK 2 MR2 - SW20 > MK2 Body Kits and Exterior Modifications > foglight question.. PDA

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unreal05-12-2011, 01:49 AMI just noticed that when I turn on my headlight my foglights goes out..what could cause this prob? shadjedi05-12-2011, 04:35 PMwell this isnt truely relevant but when i turn my head lights on my rear left tail light goes out...hmmm nocashrider05-13-2011, 01:29 AMSounds like y'all have some wiring issues so I would find the bgb wire guide and chart looking after checking fuses and relays shadjedi05-13-2011, 05:57 PMeh ive got bigger things to do then chase wires down right now lol but sure seems like one hell of an adventure when the time comes lol WrenchswingeR05-14-2011, 08:07 PMyou have ground issues gmplewa05-14-2011, 10:04 PMI just noticed that when I turn on my headlight my foglights goes out..what could cause this prob?

Factory fog lights in US cars are wired to turn off when put on the high beams. Was the lever forward in the high beam position when you tried this?

Unlike US made cars Toyota's switch the ground side of the Headlamp circuit. When the Headlight switch is off or on in the low beam position voltage for the Fog lamp relay is available via the High beam filaments. When the Fog lamp switch is turned on it grounds the fog lamp relay, closing the contacts and lighting up the fog lights. See figure below.

http://i1125.photobucket.com/albums/l595/gimpy1980/foglights2.jpg

When the Headlight switch is turned on and the headlight dimmer switch is in the High Beam position the bottom of the High Beam filaments get grounded lighting up the high beams and starving the fog lamp relay of voltage. See figure below.

http://i1125.photobucket.com/albums/l595/gimpy1980/foglights3.jpg

If your fog lamps go out when your turn the headlights on in both the High and Low beam positions then you have a short circuit between the high and low beam wiring. unreal05-15-2011, 12:41 AMThanks for the inputs & diagrams.. it def.. goes out with the low beam on.. ill double check the wiring and grounds.. and see if that works.. Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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