Question about 1990 Nissan 240SX

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Exterior light problems

1990 240sx SE. When I press in the brake pedal all my running lights come on and also when I turn on my lights, my rear left stop light is stuck in the high beam as if I am constantly stepping on the brake pedal. Tried checking to see if there was a bad ground but have not found one yet. All fuses are good.

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Check the fuses again

if not

there is a wireing problem...

Posted on Oct 22, 2008

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Where is the stop lamp or brake lamp fuse and panel for a 2007 cadillac cts?


Kevin , this is a very complex way of stoplamp control , I will post GM service Description and Operation of how they work an let you deside if you want to tackle this ! Do the center high mount brake lights work ?
The brake pedal position sensor is a resistive device used to sense the action of the driver's application of the brake pedal. The brake pedal position sensor provides an analog signal that will increase as the brake pedal is pressed.
The brake pedal position sensor receives both a 5-volt reference voltage and a low reference signal from the electronic brake control module (EBCM). When the brake pedal is pressed, a variable signal is applied from the brake pedal position sensor to the EBCM through the brake sensor signal circuit. The fuse block left rear supplies battery positive voltage to the bass relay switch through the BASS fuse. One side of the bass relay coil is permanently grounded at G402. The EBCM supplies voltage to the bass relay coil upon receiving the signal from the brake pedal position sensor. The switch contacts of the bas relay close and battery positive voltage is applied through the bas relay switch to the center high mounted stop lamp (CHMSL), and to the turn signal/hazard flasher module through the stop lamp switch signal circuit. The ground for the CHMSL is applied from G402. The turn signal/hazard flasher module then supplies voltage to the left and right stop lamps in the tail lamp assemblies that have ground at G401 and G402. For export vehicles the stop lamps receive battery positive voltage directly from the bass relay.

There could be a code stored in the EBCM - electronic brake control module - DTC B3903 Stop Lamp Relay Circuit
DTC C0278 Brake Pedal Position Sensor Not Calibrated
there are several other codes that pertane to the brake lights . you could try Replaceing the bas relay !
Fuse Block - Left Rear
In the passenger compartment, under the left side of the rear seat at carpet.

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The flasher does not stop the brake lights from working. Check # 18 fuse in fusebox under lower left side of dash. if it's ok, the brake light switch, on the brake pedal arm is next. light green wire with red stripe is hot if fuse 18 is ok. Depress brake pedal, light green with no stripe should have power. if not, replace brake light switch. If light green wire has power with pedal depressed, combination switch under the steering is next. Remove the cover from around the combo switch {under the steering wheel}. depress brake pedal, light green wire should have power. If it does, pedal still depressed, orange with light blue wire & wire with light green & orange should have power. Those 2 wires are brake & rear turn signal wires. { The turn signal switch should be in the middle, not right position or left. while checking for power in the last 2 wires. Good Luck drvolt.

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Electrical problem...(without turning the key)...when I apply brakes, the interior (dash-board) lights and exterior turn signal lights come on. Also when I have my lights on, my driver side brake light is...


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This problem sounds like a short in the lighting system. Since the side lights get brighter when you press the brake pedal, you have power crossing from the brake wire to the marker wire. Try removing the left rear brake bulb and se if the problem continues. If it does, reinstall the left bulb and try removing the brake bulb on the other side and see if that fixes the problem. If the problem persists examin the wires closely for broken insulation.

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1 Answer

1991 Honda Civic DX.The rear tail lights are staying on and no brake lights. The front lights work fine (marker/head) off the switch All fuses are good. ????


Herbie, sorry by my English. It is very simple to solve :):) of course after I breaking my head. That's the explanation and solution:
1 - When we pressing the brake pedals in our mind it looks we are pressing a switch which cut the "contact". In really is the opposite! Everytime we pressing the pedal we are realeasing (or making free) a light switch and making contact. It means everytime you do not pressing the pedal the pedal is cutting the light contact.
2 - Go down the steering whell area and look the brake pedal. You will see that there is and bolt/nut threated at brake pedal stopper. Look the brake pedal and you will se there is an empty hole. On that hole should to be a white plastic peace which looks like an arrow. That peace it has to be assembled for behind the pedal and the "arrow" may be touching the bolt/nut.
3 - The reason why you light it stay on is because the lack of the white peace it makes de metal do not touching the bolt/nut area. This gap it turns the lights on.
I only found the peace at Honda Dealer and is cheap if you considering the problem but it is expensive if you considering how simple and small it is.
Hope this can help and solve your problem.
J.Jorge
jonnexport@yahoo.com

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Check the book and make sure you are using the proper bulbs on all sides. (3957 looks just like 3956 but wont work right)

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hiya if the rear lights are remaining on ? with no ignition it will be the brake lights staying on this is easily remendied/ checked by trypulling the brake pedal up by hand and see if lights go off ? if so then you will need to adjust the b/light switch which is positioned adjacent to pedal and can be screwed inwards towards the pedal untill the plunger on switch is pushed into the switch which puts lights off ensure pedal is fully up then adjust switch reconnect the wire/plug and press pedal slightly to ensure b/lights operate ok and then go off with pedal released ? on hyundai the brakelights do not req ignition on to operate hence more likely problem is as above good luck

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