GMC Popular Questions, Answers, Tips & Manuals

When you replace the ECM or disconnect the battery, you have to reset the Security System and Engine Immobilizer. https://www.google.com/search?q=2001+gmc+yukon+security+system+reset .

It's a guess, but yes, you have one or more stuck injectors and when you power off the pressurized gas in the system is going into the combustion chambers and seeping past the piston rings. When you pull the relay, it is running on the fumes from the oil pan. You need an auto electrician, a professional grade scan tool computer can diagnose in 30 minutes. https://www.google.com/search?q=mobile+auto+electrician+near+me ..

How to Deactivate OnStar: 12 Steps (with Pictures)

wikiHow https://www.wikihow.com > ... > Car Electronics Jun 6, 2023 - The only way to completely eliminate OnStar is to physically disconnect the module from your vehicle. Other than the OnStar system and its ...

How can i disconnect my onstar gps system on 2004 gmc ...

JustAnswer https://www.justanswer.com > GM Repair Jan 28, 2011 - Hi. You can disable the On Star system by pulling the fuse labeled INFO which is a 15 amp fuse located in the under hood fuse box. 1 answer · Top answer: O.k. The On star control unit (VCIM) is the only unit that receives the GPS

PART COLOR LOCATION 12 VOLT CONSTANT RED (+) @ IGNITION SWITCH HARNESS STARTER YELLOW (+) @ IGNITION SWITCH HARNESS STARTER 2 N/A IGNITION 1 PINK (+) @ IGNITION SWITCH HARNESS IGNITION 2 WHITE (+), See NOTE #6 @ IGNITION SWITCH HARNESS IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 ORANGE (+) @ IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 N/A KEYSENSE LIGHT GREEN (-) @ IGNITION SWITCH HARNESS PARKING LIGHTS ( - ) WHITE (-) @ BCM, LIGHT BLUE plug, Pin A5, See NOTE #4 PARKING LIGHTS ( + ) BROWN (+) @ BCM, LIGHT BLUE Plug, Pin B6, See NOTE #4 POWER LOCK LIGHT BLUE (TYPE A) @ BCM, BROWN plug, Pin A4, See NOTE #4 POWER UNLOCK WHITE (TYPE A) @ BCM, BROWN Plug, Pin A3, See NOTE #4 DOOR TRIGGER See NOTE #2 @ BCM, See NOTE #4 DOMELIGHT SUPERVISION TAN (-) @ BCM, PURPLE Plug, Pin B4, See NOTE #4 TRUNK RELEASE N/A SLIDING POWER DOOR N/A HORN BLACK (-) @ STEERING COLUMN HARNESS TACH WHITE (AC) @ ECM, See NOTE *2 WAIT TO START LIGHT DARK BLUE (-), See NOTE #5 @ INSTRUMENT CLUSTER BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL FACTORY ALARM DISARM LIGHT GREEN (-) @ BCM, PURPLE plug, Pin B3, See NOTE #4 ANTI-THEFT YELLOW (+), ORANGE/BLACK (-) and RED/WHITE (Not used) GM's PASSLOCK 2 System, these wires exit the Ignition Switch Tumbler together and are in the Main Ignition Switch Harness in the Column. EXTRA INFORMATION NOTE #1: This vehicle is equipped with the PASSLOCK 2 ANTI-THEFT SYSTEM and will require a 791 Bypass Module for Remote Starting, to order go to the SECURITY BYPASS MODULE Page on this website. NOTE #2: This vehicle has 2 door trigger wires, the DRIVERS DOOR is a TAN (-) PURPLE plug, B4 and ALL OTHER doors BLUE/WHITE (-) LIGHT BLUE plug, Pin B11 at the BCM use both Door Trigger wires and DIODE ISOLATE when connecting to an ALARM SYSTEM, to connect, See DIAGRAM. NOTE #3; The ECM (Engine Control Module) is located near the battery, down low, between the fender and the fan, under a BLACK plastic cover. On the 4.3L engine it is in a 20 pin connector labled RED. On the 4.8L, 5.3L and 6.0L engines it is located at Pin 10 in the RED connector NOTE #4: The BCM (Body Control Module) is located behind the drivers side of dash, with the plugs facing the rear of the vehicle. NOTE #5: when hooking up a remote starter, if you cannot get the (+) or (-) Wait to Start wire on the Remote Starter to work properly, you will then need to disconnect this wire and Program the Remote Starter for the 5, 10, 15 or 20 Second Wait to Start Timmer in the Installation manual. NOTE #6: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!

I thought I answered this? Want to bypass your vehicle security system? The short answer is you can't! All modern cars have alarms and immobilizers. There is a transponder in the key and a receiver around the ignition lock. If both are present, the ECM (engine control module) or BCM (Body Control Module) releases power to the ignition circuit or the starter. When you turn the key, the starter spins the engine and you get a spark. If any one of those three items are not in the chain, you get the engine to turn, but no spark. There is no way to beat the system. You have to fix what is wrong, not find a way around it. The immobilizer is in place to stop exactly what you are trying to do. .. Posted by ADMIN... on Mar 26, 2016

Not according to Hollander interchange. Late 1998 to 2002 interchange. 2003 is all by itself. And 2004 to 2006 interchange. It doesn't tell what the differences are, but I would have to guess the electronic controlls.

I wouldn't be so sure it's a bad motor. There are several limit switches in the tailgate that have to show made before the roof will be allowed to move. You really need a GM computer to work on one to be able to see in real time what switch is and which one isn't made causing the fault.

Check here..... https://www.2carpros.com/questions/gmc-sonoma-1991-gmc-sonoma-firing-order Best to you.

Question edited for a lot more clarity. Question moved to GMC. Help in the link https://www.google.com/search?q=gmc+c7500+ignition+switch+wiring+diagram ..

Service Manuals https://www.google.com/search?q=1994+GMC+Sonoma+4.3+service+manual How to Change A Heater Core on a 1994 GMC Jimmy, (Chevy ...

Visit the following page, it may help 1996-1997 Gmc Yukon Vehicle Wiring Chart and Diagram (commandocaralarms.com)

Question edited for clarity. Question moved to model category. Jeff is our professional technician, and has given a great rundown of the workings. Here is a physical diagram. https://www.google.com/search?q=2002+GMC+Sierra+1500HD+headlight+wiring+diagram ..

The 95 GMC 1500 V6 automatic transmission may not be compatible with the 89 K1500 V8 4x4 due to differences in engine size and drivetrain. It's recommended to use a transmission that matches the engine and drivetrain specifications of your 89 K1500.

Which airbag is this nearest to? Steering wheel? Passenger side dashboard? Seat? If it's under the seat there is often some wiring that goes to the seat belt buckle as part of that restraint system.

Question edited for clarity. Question moved to model category. In the link https://www.google.com/search?q=1998+gmc+sonoma+2.2+firing+order ..

Try disconnecting the starter solenoid control lead and see if it still blows the fuse when no engine crank while switch in start position. Try disconnecting the alternator and see if symptoms change. You might also try using a 12V test lamp (or better, a headlamp) in place of the fuse. It may not crank but it allows you to low power circuits without blowing fuses. Observe lamp brightness as you go from run to start. Brightness is relative to current flow. Comment for further assistance.

https://www.scosche.com/media/guides/ct1031.pdf

No, as they are computer controlled. You can do the opposite, and install standard shocks instead of electronic, but not the other way around. https://www.google.com/search?q=Can+I+use+electronic+shocks+on+a+regular+shock+vehicle ..