GMC Sonoma - Popular Questions, Answers, Tips & Manuals - Page 3

I think you could use this manual method instead.. My nephew who is a full time mechanic uses it most of the times, and all mechanics look up to manuals. It's very easy he gets it from. www.reliable-store.com

The way to a fix is to view wiring diagrams an use a DVOM - digital volt ohm meter an test the electrical circuit's . If you don't know how to test automotive electrical systems like this , not just replacing part's , your best bet , take it to a qualified repair shop . Or learn how too do it correctly . Electric Testing Techniques You Need to Know Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on lighting , then under system click on exterior lighting . Click the search button ,then the blue link's . when I press the brake pedal my parking lights come on ????? To me this sounds like a ground issue , voltage back feeding through the circuit looking for a ground . view the turn signal wiring an test at the back of the vehicle ,turn signal wiring using voltage drop . Watch this video on voltage drop testing . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Inside the oil pan

Honestly I would take a look at your belt Tensioner its a ware part . Unless you have seen some kind of damage on the harmonic balancer groves I just don't see how this could happen the belt wares not the pulley also look for alignment all pulleys need to line up

You don't have to remove the steering wheel. Just lower the steering column and remove the shrouds. Call your local library and ask if they have either alldata or mitchell on demand shop manuals in digital format. Then print out the instructions. If not, buy a short subscription to alldatadiy.com or eautorepair.net

These old style check engine lights are pretty much just service reminders, and as such can be reset generally just by taking off the negative battery cable for about 1 hr. Still need to read codes, though. Check all your vacuum lines.

What engine do you have in your truck??

It's not adjustable.

id just replace the bulb, socket,and your sure you checked all fuses

Or bad float !!

I know this isn't the Sonoma but the Blazer is on the same platform in GM. Those Diagrams are for the ext. lights. You should find what you are looking for Hope it helps.

My first concern is: how do you know there isn't fire? Did you 1- Check it with a screwdriver inside the spark plug wire at spark plug end to ground. This isn't the right way. 2- Have you check fire with HEI spark tester. (The right way). To see a spark with the tester there will be 25k the spark to jump to ground and it test the coil working properly. Now the fire system or ignition spark work this way. When the engine is turning up to 400rpm the camshaft gear inside the engine makes distributor shaft turning. We often see the distributor gear at the end worn like an eaten apple. Remove the Dist. Cap Somebody starts the engine look for the rotor if it turns. This will tell you the gear is OK. P.S; What you call the SENSOR = Ignition Module just to let you know Hope it helps

You will get your solution and all info on service info, repair info, parts info, wiring/electrical/fuse diagrams, error/fault codes, torque specs, PCV, owner's/service/repair/parts/maintenance manuals etc everything this website www.reliable-store.com it's a very good website for vehicle problems even as old as 1991 ford..

I think you may have a dead cell in you battery

Common problems 1. fuel filter clog and fuel pump stop working 2. Crankshaft sensor (spark is cut during high demand) 3. Air filter clog (not enough air during high rpm hope it helps

If you look under the front of the truck, you should see a metallic engine protector cover and on the front side you will see a small hinged door with one screw holding it shut. You turn that screw out with a screwdriver probably a half a turn and it will pop out and the door will open giving you great access to the filter. Pretty slick design on their part.

If you want to solve your problem, click on the link I attached https://www.reliable-store.com/products/1997-gmc-sonoma-repair-manual

What engine ? 2.2 or 4.3 Security light lit on the instrument cluster ? Fuel injector's not being commanded on ! No Start Engine Cranks Okay Troubleshooting With Basic Tools No Power to...

If you have a check engine light, that means there's a trouble code stored. Get the code read and that should give you an indication of where to start

Door Key Switch The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM. The key lock input to the BCM is probably missing , BCM doesn't see it . So it think's your breaking into the vehicle. Did you try the passenger door to see if it will disable the alarm . The BCM - body control module ! Electronic -computer ! -------------------------------------------------------------------------------- Content Theft Deterrent (CTD) Does Not Disarm with Key Lock The factory service repair manual has a 23 step diagnostic procedure . An you would need a factory scan tool to find the correct fix. Turn ON the ignition with the engine OFF. With a scan tool, observe the door key switch parameter in the Body Control Module (BCM) security data list. Does the scan tool display INACTIVE? Locking the Vehicle Without Arming the System Use one of the following procedures in order to lock the vehicle without arming the system: • Procedure A -- Lock the vehicle using the manual door lock knobs. Close all the doors. • Procedure B -- Close all the doors. Use the key or the power door lock switch in order to lock the door. The doors must be closed prior to locking the doors for this procedure. Disarming the System In the arm initiated mode, the following conditions are true: • The security telltale is ON. • The doors are open. In order to disarm a system in the arm initiated mode, perform one of the following procedures: • Press the power door lock switch to the UNLOCK position. • Press the door unlock button on the key fob. In order to disarm a system in the arm delay or the armed mode, perform one of the following procedures: • Use the key in order to unlock one of the doors. • Press the door unlock button on the key fob. Deactivating the Alarm In the alarm mode, the following conditions are true: • The horns sound intermittently. • The headlights and the park lamps are flashing. In order to deactivate a system in the alarm mode, perform one of the following procedures: • Use the key in order to unlock one of the doors. • Press the door unlock button on the key fob. • If the vehicle control module (VCM)/powertrain control module (PCM) receives a valid Passlock™ ignition key rotation.