20 Most Recent 1999 GMC Jimmy - Page 2 Questions & Answers

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 .

Abs brain is bad

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

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.

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.

If it is flashing it probably is killing the engine .

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.

Hey. Get tips here. Manuals Schematics Comphotechtronics

Try Allldatadiy.com.

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.

More likely worn out bearings which are periodically seizing - have you checked the PS pump with the belt off? You should also check the other devices run by the belt for bearing trouble, particularly the idler pulley. Periodic seizing problems with worn bearings on any of these can cause the truck to stall and the low pressure signal.

Don't start the car !!! Can you see the part from the whole where the distributor goes ? If you can you may be able to fish it out. Your distributor has a drive shaft that goes from the dist to the oil pump in the oilpan. Hopefully it is sitting on top of the shaft. Their are know oil lines at the bottom of you engine, everything is internal. If you cant fish them out from the top, the oilpan will have to be removed. I think your best bet is to try to remove the pieces from the dist hole with a magnet on a shaft or maybe very sticky tape on a shaft. Good luck, Robert

Did you leave the key on UNTIL the anti theft light flashed or went out?Could take 20 mins.

Temp sensor is located on drivers side of engine. Look through the drivers side wheel well, will be a brass fitting.

Brske booster possibly. Do not guess when it comes to your brakes. Take it to a shop and have it done properly.