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Anonymous Posted on Jul 18, 2017
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ABS light and 4x4 wheel switch

Hi everyone, i have a huge problem with the ABS breaks, they don't work and the ABS warning light is always on now. we have been to a ''specialist'' he told us it can be the abs sensor, but couldn't show us there it is. the other ''specialist'' told us problem can be in that case which is near transfering case. we also have a problem with 4x4 wheel drive, can it be related to ABS problem? anyone had the same problem?

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5 Related Answers

Anonymous

  • 314 Answers
  • Posted on Nov 22, 2008

SOURCE: 1999 Chevy 4x4 engaging

Check the solenoid at the front axel. This is a rather common prob. First check that power is at the axel, got power, clean and put it back. Please do not even look at the tranfer case! At worst you may need to replace the axel solenoid! Frankster016

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Anonymous

  • 150 Answers
  • Posted on Jan 30, 2009

SOURCE: Abs/Brake Light ON, although new brakes, ABS still works

I would suspect a speed sensor.

flacooo1

Juan Rivera

  • 172 Answers
  • Posted on Mar 30, 2009

SOURCE: 4 lo working, 4 hi stopped working , A4WD never worked

Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Anonymous

  • 253 Answers
  • Posted on May 29, 2009

SOURCE: my abs light is always on and now my brake warning light is on but brakes seem to be working fine

The ABS light is a warning that you have an issue with the ABS system. The red brake warning lamp is serious. It is telling you that there is an issue with the base brakes. Your car will be ok with an ABS light, but the red warning lamp could be really dangerous. You should have them checked ASAP. It could be from many causes. A park brake switch, low fluid, the causes are too numerous to list. Please for your safty have it checked. Good Luck

Jeff

  • 108 Answers
  • Posted on Apr 25, 2010

SOURCE: 1997 chevy Blazer ZR2 4x4 not engaging

Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.

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I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
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    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

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    Please report back, I am curious if that is what it is. Good luck
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