Question about 1998 Toyota 4Runner

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Using left turn signal cause headlights to turn off intermidantly

Heard it may be a faulty healight combo switch, need to know how to repalce

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  • battlecj Jan 06, 2009

    Same exact problem here. I am trying to find the part online, but no one seems to have this part listed as a "headlight combo switch." Is there another name i should be using to search for this part?


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Center the steering wheel, and remove the key. Disconnect the battery. Remove the upper & lower shrouds on the steering column. You now need to pull the air bag /horn pad assembly, use torx drivers to remove it. After the airbag/horn pad is disconnected, unplug the wires. Set it off to the side. Remove the large nut that holds on the steering wheel, and remove the steering wheel. Remove the 4 screws on the black circular device with yellow tape on it. Do NOT turn this circular device left or right, you will damage it. You may or may not have to unplug this device. The combo switch will now be visible. Remove the screws, and extract the switch.

Posted on Dec 30, 2008

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I have an electrical issue that is beyond me. How do I fix faulty turn signal?

I agree that there is a short.
what could have caused the short?
Has the truck been in an accident?
did you remove the dashboard?
or any other 'under the dash or in the steering column' work?

IMHO, i don't think the cat conv had anything to do with it; the cat is on exhaust mid-vehicle and wiring for items mentioned are in steering column and dashboard where light switch is located.
Unless the mechanics that did the cat work somehow damaged the steering column / ignition switch that may have caused a short... but that is a stretch.
I have not had to deconstruct my steering column or have to deal with the turn signal, so not sure if you have to pull the wheel off first to get at them or not. But if you do, study up on removal process or else you can 'activate' the air bag.

Since I do all my own repairs, this is how I'd go about figuring it out.
Call 5-star dealers until I find someone willing to have a conversation about my problem... find the know it all guy that has answers for everything that 'enjoys a challenge' like this. Don't limit your calls to local dealers... I have found guys that help me that are 3 states away!!!
Let him know that your a DIYer and need info. A lot of times they are willing if they have time. Don't call on Sat at 8 am during weekend service rush.
Ask lots of questions.
Have you ever seen this problem before? What do you think may cause this? Does this sound like a wiring short?
And you most likely will hear 'well i can't diagnose over the phone...'
So I always let them off the hook with 'I agree and not gonna hold you to anything said here, I'm just needing an expert opinion to brainstorm with'. works every time. Continue with questions.
Do i have to take wheel off to get to signal mechanism and or ignition switch?
Ask for stuff !!!!
Do you have diagrams available that I can get/download? Is there a website for exploded diagrams or wiring diagrams?
where can I get copies from a tech manual?

Once you get a lead, try his/her suggestions.
Since this is electrical will mean trying to find the short so you need the equipment and know-how to do that. Use internet if you don't know how to find a short..... Many youtube vids on this and other topics.

before you start taking things apart, do the easy stuff first.
Is the ignition switch damaged? do you have a 'key cluster' of weight that hangs on ignition?? had difficulty turning ignition or inserting/removing key form ignition? Do you start/stop via key hundreds of times a day? could the ignition switch be worn out !?!?!?

are you good at reading wiring diagrams?
Follow the wires that are causing the problems...
signal, headlights and ignition switch.
Look for the obvious first. Broken, pinched, partially cut wires, exposed wires contacting ground....
I wouldn't think that fuses could cause this problem,but check to see if all are ok.
Then I would try eliminating all problems by removing the fuse for the headlight and turn signals.
with fuses removed, start/stop with key switch with light on/off.
if successful, put in signal fuse.
start/stop again.
if successful, or not, try left signal.
remove signal fuse, put in headlight fuse.
start/stop with light on and off.
Does it continue to run until lights turned off?
use the left signal even if signal fuse is removed...
Try all different combos here, it may give a clue to the culprit.

Hmmmmm. Looking back, I think i would try to do as much investigation as possible (fuse check, wiring check and the 'fuse tests') prior to calling svc mgrs... it will give you some knowledge of what your dealing with so you can have an 'intelligent' conversation.

hope this may help somehow. Just kinda ramblin I know, but I can't diagnose it over the pho... internet. ;^)

On the other hand, you have the 'no fix' option.
You could just continue on with an 'interesting vehicle'.
Just make sure there are no police cars around when you don't use the left blinker. Or just take 3 rights.
And look on the bright side... with the weird light switch, you'd never have to worry about leaving your lights on!!!

May 20, 2014 | 2000 Dodge Durango

1 Answer

Turnsignal and healights blink at same time

Had a similar question a few days ago and it turned out to be a earth or ground in colonial english which is behind one of the headlights under the bonnet sorry hood in colonial english as correctly pointed out on gas monkey garage the other night on TV but check the ground connection behind the headlight but i cannot remember which side but have a look and iam sure you will find it as i have no practical experiance of this vehilce sorry but our europeon vehicles are normally smaller and a diesel engine

Mar 08, 2014 | 2006 Chevrolet Trailblazer

1 Answer

My headlights wont turn on

check your relays or the off and on switch

Sep 24, 2012 | 1996 Chevrolet Camaro

2 Answers

My windshield wipers will not turn off and I have no turn signals.

I think your combination switch is malfunctioning. The switches that control both the wipers and the
turn signals are built into the combination switch. And the headlight controls too on some cars.

Your car may have a switch that controls the wipers and the turn signals, but not the headlights.

But whether you have the type that controls wipers/turn signals/headlights or just turn signals/wipers Im not sure, you didnt mention the specific year and model. But you should replace the switch that controls your wipers/signals. They are expensive sometimes, especially if you have the combo switch that controls wipers, headlights and turn signals. But you can find one at a slavage yard for a lot less money than new.

But you should put the year/model of your car when you post a problem youre having. That makes it more likely that someone can help.

Sep 10, 2011 | Chrysler Town & Country Cars & Trucks

2 Answers

Left turn signal inop on 04 Kia Sorento

nope you got a bad ground either at the light sockets or body ground

Jan 13, 2010 | 2004 Kia Sorento

1 Answer

98 Explorer's Headlights won't work...have to hold highbeam on

Sounds like your switch is bad (i.e. turn signal / healight dimmer / winshield lever switch) inside the steering column. Replace as necessary.

Apr 07, 2009 | 1995 Ford Mustang

1 Answer

I have a buick reatta 1989 2dr.parking lights will not turn off at switch most remove fuse to shut off. Hazard flasher,turn signals and brakelight not working.

You've got a bad switch. If you feel confident in your mechanical abilities, the back of the switch comes off. There are (I believe) 8 small metal tabs that need to be bent straight so they will slide through the slots in the outer casing. Then there are four or five plastic tabs that run down both sides of the switch. You need a small screwdriver to release these tabs (after bending the metal tabs straight). The inside guts of the headlight switch will slide out through the back leaving only the dash visible portion including the buttons. The buttons will fall out but just remember where each one goes. There are four metal bars that run the length of the upper part of the switch (brass bars). One of them is out of the tracks that are used to turn on parking lights when headlights are turned on and turn off all lights when 'Off' button is pressed. I'm pretty sure I have a spare healight switch around here somewhere. Let me know if interested. I'd have to look it up on EBay to see what I paid, but I believe it was about $9.50 + $4 or $5 shipping.

Let me know. Bruce McGowan

Mar 24, 2009 | 1989 Buick Reatta

1 Answer

2000 GMC Jimmy, Flasher clicks alot even after repalcing flasher

Auto headlights do go off when turn signal is put on. The wiper problem could very well be in the blinker switch in the column, they are know to go out on these trucks. Run some tests before replacing.

Feb 24, 2009 | 2000 GMC Jimmy

1 Answer

Electrical nightmare

You need to replace the combo switch. That switch controls turn signals, wipers and high beams. It is only held in by 2 screws and the hardest part is getting to the jack plugs to unplug the thing. Also if you have cruise control be very careful not to break the cruise stalk. The crusie switch mounts in the turn signal/combo switch. If you know how to use a phillips screwdriver you should be able to DIY Good luck.If this helped rate me. If you need anymore help get back to me.

Dec 24, 2008 | 1987 Mercedes-Benz Mercedes Benz 190 Class

1 Answer

How to changing the headlight

Take screws off the front cover about 10-20 screws Reemove cover then two screws by the headlight Pull wole healight out, Repalce bulb. Not that hard. Read the manuel. My 16 year old did it with her Dad

Nov 29, 2008 | 2006 Kia Sedona

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