Question about 2007 Cadillac CTS 3.6L

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

Running lights work but not brake lights, filaments aren't burnt. where fuse to stop lamps

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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.

Posted on Jun 28, 2015

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Posted on Jan 02, 2017

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1 Answer

I have a suzuki xl7 2005 model my brake lights are not working I've checked fuses and also the third brake light, fuses are good but it looks as though the bulbs on the third light are blown whatcould


all brake lamps are dead.
and fuses are good. (did you check the right ones, or all?)
what about 3rd lamp?
if they look blown they are, why question that for $1 lamp.
replace lamps that are blown, the filament goes byebye.
fuse #9 is STOP, replace this on suspission
fuse that look ok, can have hair line cracks, we test them with a meter. so as not to guess...
next is this power 12vdc from stop fuse goes to the
stop switch and if stopping (foot brake) the output goes to 12vdc and all lamps on rear (stop)glow.
its cave man simple (unlike new cars that computers do all that)
now my advice, replace all 3 lamps
or take them out 1 by 1 and try them 1 by 1.
because lamps can SHORT and blow that fuse.
all there can be hand for $3,... and a new fuse for 50 cents.


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If the break lights in my 1986 c corvette works but the tail lights do not, what could be the cause


Blown fuse ,bad headlight switch,or wiring issue.
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It would help to know a specific model, but a generic F250 answer is as follows. 15A fuse 13 in the fuse panel feeds power to the brake on/off switch which, when closed, turns on the high mount stop lamp. Power from the closed switch also is applied to the multifunction switch to turn on the stop filaments of the combination park/stop/turn lamps. If the fuse is OK and the high mount stop lamp turns on when you step on the brakes, all that remains is the multifunction switch or possibly burned out stop lamp filaments

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If any light lights up when you apply brakes, then the brake switch is ok. The problem could be a fuse and/or a relay. or the bulbs. Those bulbs are dual filament so one filament could be bad, for stop or tail lights.

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Assuming this has the V6, the 15A PARK LPS fuse in the underhood fuse block feeds constant power to the auto park lamp relay. When the relay closes, 12V power passes through the 10A INST LPS fuse in the right instrument panel fuse block to the panel dimmer switch and then to the five instrument cluster lamps.

If by "rear lights" you mean everything in the rear lamp assemblies, power for the tail lights (running lights) starts at the 15A PARKLAMP fuse in the underhood junction block, passes through the automatic lamp control (ALC) relay and the right instrument panel junction block to the tail filament of the dual stop/tail lamp and the separate tail lamp on each side. The 12 V power for the stop lamps is protected by the 20A STOPLAMPS fuse in the left I/P junction block, passes through the stoplamp switch when brakes are applied, stop filament of the dual stop/tail lamps. That leaves the turn signals and the hazard lamps. Power for the turn signals originates at the 10A TURNLAMPS fuse in the left I/P junction block and is applied to the hazard switch. Switch output goes to the turn/headlamp/wiper switch for selection of left or right turn signals. That switch output goes to the turn lamp. Power for the hazard function begins at the 10A HAZRD LPS fuse in the left I/P junction box and goes to the hazard switch. Switch output is sent to the left I/P junction box to make the turn signals flash. That's it. Post a comment if you need more information.

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1 Answer

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1 Answer

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1 Answer

I have a 1999 Ford Escort and when the brakes are applied it blows the fuse. Can anyone help?


Hi, my name is John I will do my best to assist you.

I assume you're referring to the fuse labeled STOP 15 or 20A?

If your Escort is a wagon, here are the possibilities.

1. One lamp (bulb) filament has burnt out and is causing a short inside the lamp.
2. The brake pedal position switch is faulty.

If your Escort is a sedan, here are the possibilities.

1. One lamp (bulb) filament has burnt out and is causing a short inside the lamp.
2. The brake pedal position switch is faulty.
3. The electronic flasher unit is faulty.

I suggest that you start by checking the condition of the brake light lamps (bulbs). If you find a burnt filament replace the lamp.

If the lamps are good next check the brake position switch (brake light switch). It is attached to the brake pedal arm. Make sure that it moves freely with the pedal. You can test the switch for continuity with an ohmmeter.

1. Unplug the wiring connector from the switch.
2. Connect a test lead to each of the two switch terminals.
3. With the ohmmeter set to the highest scale when the brake pedal is up, there should be infinite resistance (no cuntinuity). When the pedal is down there there should be 0 resistance.
4. if this test fails replace the switch.

The electronic flasher unit is the least likely culprit, and would be difficult to test.

If you have more specific questions please post comments to this thread and I will endeavor to monitor new activity and respond as soon as possible. I recommend that you "bookmark", or "add to favorites" this page for your convenience.

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