20 Most Recent 1999 GMC Jimmy Questions & Answers


  • A servo is a mechanism, usually a motor of some sort, that drives another mechanism. On a passenger aeroplane, for example, the control surfaces are too difficult for the pilot to operate because there is so much wind pressure against them, so they use hydraulic servos to move the elevator, flaps etc.
  • On a car, the drive by wire throttle control is a servo, which is electronically controlled by the computer, depending on the throttle position under the driver's foot.
  • In effect, the power steering ram on a car is also a servo, which is powered by the p/s pump, and controlled by the valves in the steering column.
  • On a smaller scale, the air conditioner has servos that open and close the relevant air duct flaps when the dashboard controls are shifted to control the flow of air in the car. Please note that on older cars, and some new ones, these flaps are not controlled by servos but by cables.
  • The remote controlled central locking on a car has servos in the doors that open and close the door locks when the remote button is pressed. On some cars these door lock servos are small electric motors, on others they use vacuum operated pistons, also called servos.
  • Hope this answers your question!

1999 GMC Jimmy | Answered on Sep 06, 2018


- a servo is a small motor utilized to move a component electrically.
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1999 GMC Jimmy | Answered on Aug 10, 2018


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1999 GMC Jimmy | Answered on Mar 20, 2018


This might apply .. but it for a 1999 Jimmy:
Electronic Fuel Pump Computer Problem6 Cyl Four Wheel Drive


Your symptoms could also be do to other issues ... not just the fuel pump relay. Read the embedded link within the 2carpros response.

Good luck with your troubleshooting

1999 GMC Jimmy | Answered on Jan 17, 2018


With the emergency - parking brake set ? Anytime the vehicle is running an the parking brake is off the daytime running lamps come on . That or the sensor on top of the dash is bad , or the DRL relay is bad or the BCM - body control module . Could have DTC'S - diagnostic trouble code's stored . Hooking up a factory or professional scanner would make diagnosing this easy . Do you know what wiring diagrams are ? How to use a DMM - digital multi-meter to test electrical circuits ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine . Under system click on lighting then under subsystem click on daytime running lamps . Click the search button then the blue links .

1999 GMC Jimmy | Answered on Jan 15, 2018


Fixya does not sell manuals.

1999 GMC Jimmy | Answered on Nov 10, 2017


Without the proper testing equipment an knowledge ( factory service info. ) You have no idea what's up . an don't have a chance of fixing this . Checking for DTC'S - diagnostic trouble codes is always the first step . Take's a professional type scan tool to read these codes. Serial data info from module incharge to PCM/ECM ,enable or disable fuel and or starter operation . Sends coded messages Your best bet , take it to a qualified repair shop . That white component is the ignition switch .
The design of the passlock™ system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock™ lock cylinder. The passlock™ sensor will relay the passlock™ data to the body control module (BCM). The BCM will determine the validity of the passlock™ data. The BCM will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock™ system requires the VCM/PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Wiring Systems

1999 GMC Jimmy | Answered on Oct 07, 2017


ill assume that white thing is the part that reads the chip in your key. could be the problem but i wouldnt just throw parts at it

1999 GMC Jimmy | Answered on Oct 07, 2017


May be a problem with your 4way flasher switch - may be partially engaged or failing and if so, pressing the brake pedal will stop the flasher. Try turning the switch on and off a few times.

1999 GMC Jimmy | Answered on Oct 02, 2017


Its more than likely the blend door not moving to the heat position. I'm not familiar with the location of the blend door in the 1999 GMC jimmy, since I'm not a mechanic and don't have a manual on that vehicle. If you can get to the blend door housing you might be able to move it physically.

1999 GMC Jimmy | Answered on Sep 19, 2017


If it is flashing it probably is killing the engine .

1999 GMC Jimmy | Answered on Aug 15, 2017


Make sure your your wheel speed sensors have good connections at the wheel since you just did work there. You may need to bleed the brakes again for the other problem.

1999 GMC Jimmy | Answered on Aug 10, 2017


Try Allldatadiy.com.

1999 GMC Jimmy | Answered on Jun 24, 2017


Could be a slow IAC motor when cold.Try holding your foot down 1/4 of an inch when cold starting,if it starts quickly,then it is most likely is a gummed up/defective idle air control motor.I would like to see the engine coolant temperature sensor readings also.

1999 GMC Jimmy | Answered on Jun 18, 2017

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