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We're is the ECM ? Will this effect the brake lights they don't seem to work

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Year make and model ?

Posted on Jul 20, 2013

  • pete escamilla Jul 20, 2013

    1992 cadillac seville sts

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My 90 4runner has the brake and battery light on. The power is going in and out and sucking the battery dry.whats the hell is wrong?


there is a problem in the charge circuit and it indicates a short in the system
could be in the alternator or voltage regulator or if the voltage regulator is in the ECM , the ECM itself
If the alternator was not removed and bench tested , any wire problems would be revealed and the unit not properly tested
check for bad ground wire from the battery to the engine

May 26, 2017 | 1990 Toyota 4Runner

1 Answer

Abs sensor location


Actually, the brake system HAS indicated a problem -- that's exactly what the ABS warning lamp is doing! Unfortunately, the very nature of the ABS system means that you will not usually notice a system performance problem until it's too late -- that is, until you need the system to work and it doesn't!

There is not just one ABS sensor -- in fact, in most cases, there are four. Also, the fact that the warning light is on does not necessarily mean that a sensor has failed -- it just means that the system has stopped working properly and/or has failed its self test. The problem could be as simple as a sensor or exciter ring/trigger wheel, or it could be a wiring harness, modulator, or ECM issue.

Generally, unless something has struck or disturbed a sensor or exciter ring/trigger wheel, they are normally not high-failure items.

Typically, an ABS system monitors the rotational speed of each wheel and reports that speed to the ECM. The ECM compares the speeds of all of the wheels during braking, and if it finds that one (or more) of the wheels is not rotating while the others are, it modulates the brake pressure to the stopped wheel(s) as a means of breaking the skid and getting the wheel(s) turning again.

The wheel speed measurement is accomplished via a sensor positioned in close proximity to a toothed wheel called an exciter ring or a trigger wheel at each vehicle wheel position. Sometimes, the exciter ring is machined into the inboard face of the brake rotor, drum or hub. In others, it may be pressed onto a shoulder on the axle shaft. Regardless of its actual implementation, there is a calibrated fixed distance between the exciter ring and the face of the sensor when both are properly installed.

The sensor itself is effectively a coil of wire wrapped around a magnet (either a permanent magnet or an electromagnet). As the exciter ring turns, its teeth and gaps alternately pass the core of the sensor and influence the magnetic flux field surrounding the sensor's coil. This alternating rise and fall of the flux induces an AC signal in the sensor coil, which is the signal monitored by the ECM. The frequency of the AC signal is proportional to the wheel speed.

Some of the things that can disrupt proper wheel sensor operation are impact damage to a sensor, to its cable harness, or to its exciter ring, filling (or partial filling) of the exciter ring tooth gaps with ferrous material such as brake drum or rotor filings, and, of course, physical damage due to improper service operations.

Has any repair or maintenance work been done on the vehicle shortly prior to the problem appearing?

Oct 04, 2012 | 2000 Chevrolet Impala

1 Answer

No brake lights, blubs and fuses ok. center brake light DOES work


Usually when the third brake light works but the regular lights don't the problem is in the turn signal switch.
I would check for voltage there.

Jul 19, 2012 | 2004 Jeep Grand Cherokee

2 Answers

When I turn my lights on my tail lights work but when I hit my brakes the don't light up I have a 2001 vw beetle????


the brake lights don't light up or the taillights don't light up? the brake lights are brighter than the tailights so the tailights won't show up whenbrakes are applied. if no lights work when brakes are applied then check for a bad ground at the light assembly.

Jun 14, 2012 | 2001 Volkswagen Beetle

1 Answer

I have recently replaced the wiring in my utility trailer and mechanic has tested lights when in the shop and says they're all working fine. Hooked it up to my pathfinder and lights were not working. ...


lights on the trailer are supposed to only work when the vehicle has its lights turned on. brake light problems is easy to figure out. it should run off a yellow wire for driver and a green for passenger. see if you have power with brake on. if so check the bulb. if not then check your 4 way flashers which run off the same general circuit. if 4 ways work but no brake lights double check your converter connections.

Sep 24, 2011 | 2002 Nissan Pathfinder

2 Answers

Brake lights dont work Bulbs are good and brake light switch is good


The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!

Aug 28, 2011 | 1992 Subaru Legacy

3 Answers

To whom it may Concern: My 2002 Toyota Corolla real brake lights and front high beam head lights have stopped working while all the light bulbs are still good. In fact they have not power going to...


In the passenger compartment: The Fuse no.# 18 (15A) = rear brake lights

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If the fuse no.# 18 - F18 (15A) is good, check and replace if necessary the brake pedal switch!

Jun 03, 2011 | 2002 Toyota Corolla

1 Answer

Abs light on dash, brake lite on dash, speedometer not working, jumping in and out of overdrive.


You have multiple problems. Make sure the brake fluid is at the proper level. Most of the time when I see this and the fluid is correct with no other mechanical issues it turns out there is a short due to an after market alarm that was installed incorrectly. Make sure you don't have a caliper sticking on one of the wheels which will cause the ABS and Brake Lights to come on. You'll also want to make sure your emergency brake isn't stuck. The ABS module malfunctioning would explain the ABS light and the Brake Light but not the speedometer issue. I have given you a lot of things to check because you need to be sure those are all working correctly. Because you added the Speedometer issue this is most likely going to be a short somewhere in the circuit or a possible issue with the ECM. It is possible a faulty ABS module could cause this, before you go get a new one though, try locating one in a local Junk yard and switch it out. If the lights go out you know that is the problem and you can go get a new one, I don't recommend using junk yard ABS parts for anything other than testing. With those lights on you can go to Auto Zone or Advance auto and ask them to connect the code reader to the vehicle and get a better idea of where you need to look.

Apr 13, 2011 | 2001 Dodge Dakota

1 Answer

I have a 2003 Pontiac Grand Am Track off light and ABS light and Sevice Vehicle Soon light stays on all the time. Sometimes the emerge light comes on.(i, P light). For the Service Vehicle light, I...


the traction control system works off of the abs system so there is a code in the abs module that needs to be pulled so you know were to start to check the system out.the service engine light is a different system all together and there is a code in the ecm that must be pulled so you know were to start to check to repair that system.you don`t say why you jumped to the conclusion that the gas cap set a code.the emergency brake light will come on if the e-brake is not all the way in the off position(something may be holding the lever up just enough to put the light on.the switch could be misadjusted and needs to e readjusted.

Mar 30, 2011 | Pontiac Grand Am Cars & Trucks

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