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1999 blazer Doors lock and unlock even when parked, help

Posted by Rachel Herbel on

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Jeff Armer

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  • Cars & Trucks Master
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Lock an unlock by them selves ? Door locks are computer controlled ,by the BCM - body control module .
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Power Door Locks Circuit Description
The power door lock system includes the following components:
• The door lock actuators
• A door lock relay
• An door unlock relay
• A driver door unlock relay
• The door lock and side window switches
• The body control module (BCM)
• The endgate lock cylinder switch /liftgate lock cylinder switch (utility)
• The keyless entry, if equipped
The door lock and liftgate mechanisms may be controlled by the following switches:
• The door lock and side window switches
• The BCM
• The endgate lock cylinder switch / liftgate lock cylinder switch (utility)
• The keyless entry, if equipped
The following locking functions are included on the vehicle:
• All the doors unlock -- All the doors will unlock, including the endgate/liftgate, when any power door unlock switch is detected. The passenger doors lock directly by pressing the lock switches. The driver door unlocks by the BCM using a driver door unlock relay.
• All the doors lock -- All the doors will lock, including the endgate/liftgate, when any power door lock switch is activated. All the lock actuators will activate directly from the power door lock switch (external to the BCM).
• The end/lift gate lock switch -- All the doors will lock or unlock from the end/lift gate lock switch.
• The lockout prevention -- This function will prevent the doors from automatically locking if the keys have been left in the ignition and the power door lock switch is operated.
The motor is protected by a built-in electronic circuit breaker (ECB). If the motor is overloaded or voltage is applied for an excessive amount of time, the ECB internal resistance increases, essentially creating an open circuit. The resistance returns to normal only after voltage is removed from the circuit, thereby restoring circuit continuity.

You have a bad switch input to the BCM !
Door lock acting up 2005 Chevy Malibu fix it here
Door Locks Go Crazy 2

Posted on Jan 07, 2018

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5 Related Answers

keemo68

Ronald Mueller

  • 1263 Answers

SOURCE: 2007 Toyota Corolla all doors unlock when car put in park

you would have to by pass the circuit in order for this to work however our abilty to start the vehicle would be compromised in the effect that this circuit also includes the neutral safety switch. i would advise not to do this. please rate this........thanks

Posted on Sep 05, 2008

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Anonymous

  • 62 Answers

SOURCE: 2005 silverado door locks

i work at a chevy dealership,just had the same problem my fix was to replace the power door lock relay located on drivers side interior fuse block

Posted on Jan 21, 2009

Anonymous

  • 1 Answer

SOURCE: 1999 gmc suburban, door lock won't unlock

You need your door lock actuator's replaced because they are sticking.

Posted on Apr 10, 2009

Anonymous

  • 576 Answers

SOURCE: I have a 1999 Subaru Impreza- Remote locking

First, it may seem obvious, but check the fuses associated with the remote unlock. Next, go to Autozone or somewhere like that where they have a remote tester. That will tell if the remote is functional. If the remote works and the fuses are good, see if you can find out how to program remotes to it. It may have forgotten the code for that remote.

Posted on Dec 03, 2009

Testimonial: "Thanks for the tips, i'll do some investigation.. I'm amazed at the quick reponse! "

Anonymous

  • 68 Answers

SOURCE: 2008 chevy malibu. cannot unlock doors from dirver

Intermittent door ajar switch contacts.

Posted on Mar 05, 2010

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1995 Chevy Blazer Wire Color Codes


95-97 blazer or 94-97 S-10
12volts red (there will be 2)+ ignition harness
Starter purple or yellow + ignition harness
Ignition pink + ignition harness
Second Ignition white or pink/white + ignition harness
Accessory orange + ignition harness
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Parking Lights+ brown switch or rear harness
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Dome Supervision use door trigger
Trunk/Hatch Pin tied in with doors
Trunk/Hatch Release black/white + switch or keyless
Tachometer white AC ECM
Brake Wire white + at brake pedal switch
Parking Brake black at the pedal
Horn Trigger black - steering column

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