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Bypass security system on 1999 gmc sonoma

I need to bypass the security system so i can drive the truck dealership wants 1000 to replace bcm and flash, please help thanks robert

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

tunercars_2
  • 6 Answers

SOURCE: 1995 GMC Sonoma wo't start

check the coil. maybe the gas fillter is pluged.maybe bad spark pulg wires. maybe wrong fireing order.maybe bad gas pump.

Posted on Dec 20, 2008

jmeyer847
  • 185 Answers

SOURCE: where is the starter or silanoid.my truck will not turn over?

located on the transmission bell housing usually on the bottom drivers side.
Thanks for using fixya!

JC

Posted on Jan 06, 2009

  • 1 Answer

SOURCE: how do i bypass security on 98 gmc jimmy 4.3

I experienced this problem, intermittant failure to start. This procedure must be done with the truck RUNNING.

Remove the cover off of your ignition switch. On the top there is a small wire connector that, once the truck is running, should be disconnected. This will turn on the 'SECURITY' light. All will be better, except the security light will be on at all times, much cheaper than replacing the ignition switch, however.

Posted on May 10, 2009

  • 341 Answers

SOURCE: 1999 GMC sonoma starte installation

2.2L Engine remove protective shields as needed then remove front exhaust pipe. Remove the brace from the engine to the clutch housing, then disconnect starter wiring. 4.3L Engine 2 wheel drive just remove the right front tire and you will have access to the wiring. 4.3L Engine 4 wheel drive you must remove the differential carrier shield if equipped then remove the starter bolts and rotate the starter to get access to the wiring. Good Luck.

Posted on Jun 15, 2009

  • 753 Answers

SOURCE: I have a 1998 gmc 1/2 ton truck and the security

I think you could but it would be extremely hard and time consuming.All you need to do is take to your local GM dealer for them to use there Tech2 to learn the new key code into the body control module.

Posted on Aug 22, 2009

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Dec 12, 2015 | 1991 GMC Sonoma

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Where is security system located and how do you bypass it?


You don't by- pass Security System, it's fitted for a good reason., Plus they are 100% complicated , made not to be BYPASSED

Mar 16, 2015 | 2001 GMC Sonoma

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How do i bypass security system on my 1999 gmc sonoma


Do a relearn. 10 minutes on, 30 seconds off, 3 times . then try to start.

Jan 03, 2015 | GMC Sonoma Cars & Trucks

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My 99 gmc sonoma dash cluster doesnt work until i turn on headlight switch


This is the BCM it is located behind the radio in the dash. They are not cheap.

Feb 06, 2014 | 1999 GMC Sonoma

1 Answer

My 1999 GMC Sonoma speed odometer doesn't work, all other dash functions work. What could be wrong?


First, there are three different sound systems available for a 2003 Oldsmobile Bravada. The wiring diagrams are completely different for each of them. The options are:

> Base Radio WITH Rear Seat Audio
> Base Radio WITHOUT Rear Seat Audio
> Preminum Sound Radio (seperate amplifier)

NONE of these systems have ANYTHING to do with the speedometer other than the fact that the Instrument Panel Cluster (IPC) gets its speed information from the Body Control Module (BCM) and all three of these possible sound systems also tie into the BCM.

The only thing I can guess is that your aftermarket installation is completely unable to communicate with the BCM as it is supposed to, and is also interfering with data communications between the BCM and the IPC.

The Powertrain Control Module (PCM) also communicates with the BCM and needs this information to control the engine and transmission properly. If you have engine control codes, I would recommend that you THOROUGHLY investigate and repair these before doing any thing else to your vehicle. Also, you need to scan the rest of the modules in your vehicle to see if it can be determined what is going on. I am willing to bet that your system is full of "U" codes, indicating network communications failures.

Jun 07, 2012 | 1999 GMC Sonoma

2 Answers

How do i bypass the security on my chevrolet s10 so that it will crank


YOU CAN CRANK VECHICLE BY PUTTING KEY IN THE IGNITION SWITCH IN ON POSITION FOR 10 MINUTES UNTIL SECURITY LIGHT TURN ITSELF OFF.THEN TURN OFF IGNITION SWITCH FOR 5 SECONDS THEN START ENGINE.YOU CANT BYPASS THE THEFT SECURITY SYSTEM BECAUSE ITS A FEATURE THAT CAME WITH TRUCK.THEFT SECURITY SYSTEM IS CONTROL BY BCM AND PCM. IF YOUR IGNITION KEYS AND SWITCH IS FAULTY ALSO THE BCM THEY ALL HAVE TO BE REPLACED AT DEALERSHIP AND REPROGRAMMED CANT BYPASS SYSTEM YOU HAVE TO GET IT FIXED.

Mar 12, 2011 | 1999 Chevrolet S-10 Pickup

1 Answer

What does the dashboard "Security"


In your case, im betting that the light comes on while driving and then turns off. This is the pre curser to your vehicle not starting at all. When this happens, you'll be looking for this info here.
This is my generic Vats security answer------


The problem is your Vats security system. This causes the car to either "not start" or "shut down" while running, or start for 5 seconds and then die. (depending on the system) If the security light flashes, i guarantee that this is what the problem is. 1st trick, (if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my regal for more than a year. If its shuting down while running, im sorry i have no quick fix...

Cheap fix: Bypass the chip in your key. Temporary, but effective. Until the TDM (theft deterrent module) in the dash poops out, then you're kinda screwed. I was told that these types of key security systems have a 7-10 year life span. Sucks for us. This link explains the "Key Issue" pretty well.
----- http://vats.likeabigdog.com/


Never worry again fix: Bypass the whole VATS/Passlock/passkey I or passkey II system entirely. Literally take it out, and throw it away. I just did this in my Regal. Took about an hour. Took longer to find the thing than it did to fix the problem. For a list of cars effected by this problem. See the NEWROCKIES link on the right side of their page......... They sell a unit for 200 bucks to totally bypass this system FOREVER. life time-money back and all that. Finally did this in my car. Well worth the 200 if you've looked into getting this replaced... Anywhere from 600-1000 bucks.
----- http://newrockies.ca?ap_id=judd0081
----- With this fix, you can take that whole Vats, passlock, passkey **** system out of your car all together. Good info on both sites

Jan 21, 2011 | 1999 GMC Sonoma

1 Answer

I 'v been this roblems over 3 years and spent so much money to fix it. My 1999 Oldsmobile Alero wont start with security theft light flashing. I have to wait for 10 minutes and then if i lucky it may...


SOUND LIKE THE THEFT SECURITY PROBLEMS. MOST OF THE TIME.THE IGNITION KEYS OR IGNITION SWITCH KEY LOCK CYLINDER WORN WHERE THE BCM AND PCM DONT RECOGNIZE KEY OR SWITCH SIGNAL.SO THE BCM AND PCM WILL GO IN THEFT SECURITY MODE.THE DEALERSHIP WILL HAVE TO FIX.BECAUSE IF THE KEYS , IGNITION SWITCH AND LOCK CYLINDER AND BCM HAS TO REPLACED.THEY WILL HAVE TO BE REPROGRAM USING DIAGNOSTIC EQUIPMENT. NOT A HOME FIX.YOU WILL NEED TO GET FIX SOON AS POSSIBLE.BECAUSE FAULTY SECURITY THEFT CODE WILL SHUT DOWN VECHICLE FUEL SYSTEM WHILE DRIVING OR IT WILL GET TO A POINT WHERE CAR WONT START NO MORE.THIS FIX WILL COST ABOUT $600.00.

Dec 23, 2010 | 1999 Oldsmobile Alero

1 Answer

Mu 1999 Alero has had numerous problems with the security system. It now cut out when I was driving and I can't get it to start! Why? Cost?


MOST OF THE TIME WHEN THEFT SECURITY SYSTEM GOES BAD THE CAR WILL HAVE HARD TO START PROBLEMS OR STALL OUT WHILE DRIVING.CAUSE OF THE PROBLEM COULD BE WORN OUT KEY OR FAULT IN THE BCM CONTROL MODULE.THE DEALERSHIP HAS TO FIX BECAUSE THEY HAVE TO REPROGRAM IT.COST ABOUT $600.00. FIX IT SOON BECAUSE TOO DANGEROUS TO DRIVE AROUND TRAFFIC.BECAUSE FAULTY SECURITY THEFT SYSTEM WILL SHUT OFF FUEL PUMP.THATS VERY DANGEROUS.

Sep 07, 2010 | 1999 Oldsmobile Alero

1 Answer

Dono star inicion


WHEN YOU SEE SECURITY WARNING LIGHT.YOUR IS BCM FAULTY OR IGNITION KEY OR IGNITION SWITCH IS WORN UNTIL A POINT WHERE THE BCM AND THE PCM DONT RECOGNIZE THE KEY OR IGNITION SWITCH.SO IT GOES INTO SECURITY MODE THINKING CAR BEING STOLEN.CAUSING SECURITY LIGHT TO COME ON.THIS IS A DEALERSHIP FIX.NOT CHEAP FIX.COST $500.00 THEY WILL HAVE TO GO IN DASH.IF ITS YOUR BCM. BUT THE DEALERSHIP HAS REPLACE BCM OR IGNITION KEY AND SWITCH.THEY WILL HAVE TO REPROGRAM THEM TO THE BCM AND PCM SO YOUR CAR WILL START AGAIN.

Mar 03, 2010 | 1999 Oldsmobile Alero

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