Question about 1991 Acura Legend

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Brake lamp and rear turn signals

Brake lamp and rear turn signal doesn't work on my Ford F-150 unless I constantly adjust the steering wheel until the began to work. what's wrong?

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Sounds like a bad connection from your turn signal switch check you connections under your sterrring column

Posted on Feb 20, 2009

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Posted on Jan 02, 2017

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08 Buick lucerne cxl. Third brake light works as well as front signal lights. No rear brake lights or turn signals. Tail lights and headlights and third brake lights works. Bulbs good. Help


Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

Sep 08, 2017 | Buick Cars & Trucks

1 Answer

Need to know how to attach parts under dash on 1988 f150 from brooster tobrake pedal so brake lights dont stay on


I'd have to check the stop lamp switch. It should be activated by the brake pedal arm. W/o being able to look at your vehicle at your vehicle, I can't tell you how to get at it? The lite green wire in diagram should not be hot unless you press the brake pedal. If you lift up on brake pedal does the brake lamp go out? If it does go out, maybe you can adjust brake switch, possible problem with brake switch or connector?
The voltage for brakes is wired through multifunction switch, that is something else to check. At the rear, your brake lamps and turn signal use the same bulb filament, just not at the same time.
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Dec 05, 2016 | 1988 Ford F 150

1 Answer

Would fuse cause rear brake lamp and turn signial to stop working ? change bulb did not help


I doubt it. Usually you have one fuse for all 4 turn signals.
You might try the emergency flashers and see if they work that way.
The problem could be in the lamp socket or the turn signal switch.

Jan 21, 2013 | 2008 Ford F-150

1 Answer

My 2001 ford expedition right hand rear turn signal and brake light doesn't work but right front signal works


Multi-function switch,(Wipers turn signals cruise) , this may sound crazy, but if you can get to the screws & remove it, smack the unit on a table top 2-3 times & re-try.
Let me know what happens. This DOES work on all Ford U-Haul trucks!

Jul 12, 2012 | Ford Expedition Cars & Trucks

1 Answer

I have am 1988 Ford F150 and am havving trouble with the brake lights. I have power and a good ground the signals both work and my tail lights work......just no brake lights. Any ideas?


check both left and right lamps at rear .if one lamp is shorted internally it will disable your brakes.These bulbs are dual winding lamps for signal and brakes.I would replace them both if not then you might have issue with brake switch

Sep 22, 2011 | 1988 Ford F 150

1 Answer

I have a 2003 2 door explorer sport, just recently my turning signal and break light have stopped working on the passenger side!! I changed the light bulb, and nothing!! I changed the turning signal light...


No, because the left side is still working. The loose wiring was to the multifunction switch (turn signal).

Power gores through the turn signal switch to the brake switch on the brake pedal, then to the rear lights. Does the highmount brake lamp work?
At the RH lamp socket, Measure the voltage between the RH rear lamp C4032 pin 3, circuit 5 (OG/LB), harness side and ground. Should be 12 volts.

try that first.

Did you change the front and rear bulbs?

May 21, 2011 | Ford Explorer Sport Cars & Trucks

2 Answers

Rear brake lights, rear turn signals inoperable. bulbs replaced and are working, simply not responding to brake or turn signal?


If the third brake light always works, then it is the turn signal switch. If the third brake light does not work, it is probably something else. The turn signal switch is in the steering column. You have to remove the airbag and steering wheel, take out all of the componets and replace the turn signal switch. Special tools are required and a moderate level of mechanical ability. Watch the airbag, it can go off and cause serious injury!!

Sep 24, 2010 | 2004 Chevrolet Malibu

2 Answers

1999 ford explorer the 2 lower brake lights won't work but the 3rd upper brake light works fine ...... whats wrong ???


check the rear lower bulbs, if good nore than likely brake lamp switrch on brake pedal, 3rd lamp rns of separate circuit

Aug 13, 2010 | 1999 Ford Explorer

1 Answer

No turn signals /breaklights/no powerlocks /e350 ford


turn signals and brake lamps go thru what ford calls a multi function switch.usually replaceable w/o removing steering wheel.pricey item...dealer only part. hazard lamps working?also part of the same switch.power locks not part of this switch.ground good on back of pdl switch?usually activated by grounding.hope this helps...

Mar 31, 2009 | 2002 Ford E350

1 Answer

No tail lights no brake lights no turn signals


oh yes,, believe me you have just enter the pits of hell..
i have a 1990 thunderbird and your lights and **** are all right there with the stereo wiring my dash lights went out and it took forever to figure out how to get them back on good-luck ray
if you need me just holler

Nov 17, 2008 | 1994 Ford Thunderbird

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