Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock
Security light stays on we have tried putting in a new battery, new alternator, new fuel pump, new spark plugs,new fuel valve ,checked all the fuses.we checked that the ignition had spark until it shut off
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The most common repair is to replace the ignition lock cylinder due to broken wires inside the steering column. Most common problems related to the Passlock family involve the Passlock sensor. The sensor is part of the ignition lock cylinder on Passlock I and Passlock II systems. ( Where the key goes ), Good-Day!
The passlock module which is behind the ignition switch on the steering column is your problem. When the module goes bad, it thinks the car is being tampered with and will not allow the car to be started.
This car is equipped with Passlock antitheft security by GM. You dont have a chip, but there is a transponder in the key head. This system is known to fail. The fact that the security light is on proves the failure of the Passlock and why it wont run. The hard part is finding out which part of the passlock system has failed. Read this link for info and DO IT YOURSELF solutions to the problem.
1. Attempt to start the car, let it stall, but DO NOT turn the key off!
Leave it in RUN.
2. Wait 10 minutes or until the Theft System light glows steady instead of
3. Do not turn the key off, but start it immediately.
4. This should reset your Passlock system.
The other issue is that the BCM harness is known to corrode and will cause the passlock to fail and will lead to a no start. Check the BCM under the glove box, the bcm had somehow get's wet and the terminals corrode. Sand
down all the corrosion that you could and put the bcm back into place and
the car should started up fine and worked normally if done right. ONLY DO THIS IF YOUR SECURITY LIGHT STAYS SOLID AND DOES NOT RESET FROM THE ABOVE INSTRUCTIONS.
i have by-passed it but it is not recommended the theft light will stay on all the time ..it sounds though that the body controll is acting up as that controlls the locks and misc dash lights,also common problem is driver side fuse box
are you using the same key you always do ? the key is the problem usually .. these are a pain in the **** .the key is a chip key matched up to your ignition .. . you might have to take it to a dealer to get this repaired right .. not just something you can quick fix usually .. thanks Jerry and holler if you need more.
First of all make sure all your battery connections are Clean and Tight. If they are and all your dash lights come on and its not starting But its cranking over Your anti theft alarm may have gotten activated. You may have to leave your Key in the On position for 20 minutes to reset the alarm. Not cranking just in the on position, Now if its not Cranking and your hearing a clicking sound it may be your starter. I have sometimes tapped on the stater with a deadblow hammer and had someone crank it over Making sure your in park foot on brake and being EXTREMLY Carefull that you are not going to run someone over. If that don't get you going Get back to me we can do some more trouble shooting. Get that thing going for you. Thanks, Bear001