Question about 2004 Jeep Grand Cherokee

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I replaced the switch for my brake lights under the dash at the brake pedal and now the alarm system is going off an the truck won't start

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  • Christopher Foulkes May 11, 2010

    Did you disconnect the battery?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

johnny5846
  • 379 Answers

SOURCE: 89 chevy 2500 silverado

that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

Posted on Jan 09, 2009

  • 1 Answer

SOURCE: 2005 malibu where is the brake light switch?

There isn't one.  This car has a "brake and throttle by wire" system and the brake light switch is inside of that.  You have a bad brake position sensor.  Figure $240 or so at a dealer.

Posted on Jan 15, 2009

  • 65 Answers

SOURCE: 2005 f150 spongy brakes

it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help

Posted on Mar 24, 2009

  • 1 Answer

SOURCE: brake lights stay on all the time. tail light 95 mercury villager

Just had the same thing happen to our minivan.......went to the Nissan dealer, since the Villager and the Nissan are the same van, and they actually had the parts in stock. Tell them what is wrong and have them pull up the schematic. You need 2 plastic buttons that push in the holes by the brake pedal. It cost about $10 for the 2 of them.

Posted on Jun 13, 2009

  • 1 Answer

SOURCE: 99 Jeep Grand Cherokee Brake light problem

You can adjust the switch by putting your thumbs on either side of the switch plunger and pushing toward the brake lever. The switch shaft will ratchet into the new position which is will then be depressed by the brake lever when it is the brake is not being depressed.

Posted on Jun 23, 2009

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1 Answer

Brake light won t turn off at dash fluid full


That light is also tied in with the parking brake,with the key and light on pull up on parking brake pedal to see if light will go off, assuming you have a good brake pedal & not a mushy feel then it's doing it's job telling you have a hydraulic issue in the system.The switch for the parking brake is mounted on the mechanism and a single wire to it,works off a cam with pedal pushed down switch grounds the circuit.

May 06, 2014 | Dodge Caravan Cars & Trucks

1 Answer

96 deville brake lights won't go off after car is off why?


Check brake light switch, on back side of brake pedal
arm, under dash

Nov 23, 2012 | 1996 Cadillac DeVille

1 Answer

1997 Lincoln Continentalhorn won't stop honking


First, Have your Battery tested. The Alarm systems in Ford made Products are very sensitive to Voltage. There are 3 systems in the car which interrupt power, the Alarm system (horn honking) and the Battery saver and finally the starter interlock system.

The Alarm system will do several things to disable the car from starting. It will reduce the voltage to the starter to prevent the engine from turning over. Some will even kill the ignition system so that if the starter is jumped, the car still won't start.

The Battery saver will disconnect any system to prevent discharge below a minimum threshold. Unfortunately, when the Alternator is working extra hard to charge a really bad battery: it will disconnect the charging circuit because it reads the Draw going to the Alternator to produce the power as a parasitic drain. Even at 70mph I have seen the charging disconnected and the vehicle coast to a stop when the electric runs out.

The last system worth mentioning is the Starter interlock. Under the dash and at the top of the Brake pedal lever is a switch. When you press the brake pedal, the switch allows the starter to crank provided the shifter is not in D or R. Drivers feet routinely hit this switch and either move it or break it. When it breaks it can short and drain the battery.

As you mentioned a Random problem, the Brake switch can shake to create a random problem if it is loose or broken. Your rear brake lights can be affected.

With the horn honking, at least part of your problem is the Alarm system. You can have a bad ignition switch too, which reads the keychip to disable the alarm. Your keychip may be bad and setting off the Alarm.

I had a new Lincoln myself which set off the Alarm randomly. I actually slept inside the car one night so I could turn off the alarm in the Apartment complex parking lot. Did'nt know if it would start again if the battery was disconnected and then reconnected. The Battery was shorted with less than 1000 miles on the car. It was a factory defective battery less than 3 months old.

But your car has many years and miles on it so it was worth mentioning the wear items. I hope my solution is helpful.

Sep 07, 2012 | 1997 Lincoln Continental

2 Answers

My 1997 rodeo brake lights won't work


Have you replace or tested the brake light switch at the brake pedal arm under the dash? If not do so, it is likley the problem.

Jan 25, 2012 | 1997 Isuzu Rodeo

2 Answers

Locate brake switch under dash, brake light stays on when off.1992 chevy cavalier


Should be on brake pedal under dash, could be brake switch is sticking or bad try pulling up on your brake pedal, if tail lights go off that's what it is, if not your switch is staying stuck in.

Dec 24, 2011 | 1992 Chevrolet Cavalier

1 Answer

Shift lever lock won't release when brake pedal is


do the brake lights work? most of the time the problem is a broken wire at the brake light switch under the dash on the brake pedal. the ECM does not see the signal from the switch so it won't allow the car to shift from park.

Jul 19, 2011 | 1992 Lincoln Town Car

1 Answer

My break lights won't go out. I'm told it's a break light switch problem but I can 't locate the switch


Hi the brake light switch is located on your brake pedal.
If you follow the brake pedal as it goes under the dash ( you may need to take off a panel below
the steering columm for better access ) You will see the switch, it has a plunger on it which moves with the brake pedal movement.
These switchs are not to expensive.
I hope i have been of some help to you
John ( South WalesUK )

Jun 20, 2011 | 1998 Honda CR-V

2 Answers

My brake lights arent working!


Normally you'll find a brake switch at arm of brake pedal, up under dash. Switch should have 12v going in one side, when pedal not pushed, and both sides when pedal is pushed.

Jun 03, 2009 | 2007 Kia Rio 5 Sx M/T Hatchback

1 Answer

Brake lights


Brake lights are controlled by one of two means; a switch, normally located under the dashboard which is operated by the brake pedal suspension or a pressure sensitive switch that monitors the hydraulic fluid pressure of the braking system.
The first switch makes contact when the pedal is pushed, the second, when pressure rises in the braking system. .

Either way, the switch has probably failed or is the first type, the pedal is not returning all the way to its stop therefore leaving the mechanical switch in its 'on' mode.

Check for the mechanical switch first under the dash and press the brake pedal just with your hand while you are watching the suspension to see if when you let go of the pedal that it returns to its stop.
Once you let go of it, lift it to see if there is still a distance to the pedal stop.

I have seen this kind of switch get worn or sticky and prevent the pedal suspension from returning completely which will keep the brake lights on.

If you find no mechanical switch under the dash, locating a pressure switch is more difficult since it is likely under the hood and perhaps not easily seen.
You might need a Peugeot mechanic to locate it for you.

Jul 03, 2008 | 2005 Peugeot 405

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