I want to disarm the electric door locks on a 1999 chevy silveradoo

Do you know how to use a wiring diagram along with a DVOM - digital volt ohm meter to test electrical circuit's ? Plus ,do you know what a BCM - body control module is ? The driver an passanger door lock switch's are just inputs to the BCM , low voltage inputs. The park neutral switch is also an input to the BCM ,that part is working - taking out of park an into park - locks & an unlocks the doors . The door switches inputs are missing ,probably . Bad ground at G302 or open in wiring . Check the flex boot from the body to the doors - Wire's like to break inside . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on body & accesories ,then under subsystem click on power door locks .
With just the switches not working i wouldn't think that the BCM was the problem , but you never know . Did you disconnect the battery to clean the corrosion ? Sometimes disconnecting batteries can cause electronic modules to act up ,if you know what i mean .
Battery Disconnect or Replacement Problems

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 !
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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.

Hi,
Plz explain...are the locks supposed to lock/unlock when you put the car in Drive/Park, or not?

Does the lock/unlock SWITCH on the DRIVER'S door work/not work? If applicable, does the PASSENGER's door lock switch work?

Td

You either have a bad "arm/disarm" switch or the switch has fallen off from the lock cylinder.

What is happening is the security system is not receiving the disarm signal when you unlock the door with the key. It thinks the car is being stolen so it continues to lock the lock to prevent this.

There arm/disarm switch is clipped onto the door lock cylinders on the front doors and the rear hatch. If it does the same thing with the other doors than there may be an issue with the security system. If the other doors work fine than I would pull the door panel (I assume you are getting this problem with the drivers front door) and inspect the switch.

Here's a pic of what it looks like

If you have any questions let me know.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

it sounds like one of your door switches is setting off the alarm. Or you hood or trunk switches.

Anti-Theft -Perimeter The perimeter anti-theft system consists of the following:

• door lock cylinder disarm switches
• liftgate lock cylinder disarm switch
• generic electronic module (GEM)
• door open warning lamp switch
• pulse stretcher module (wagon only, is located between the rear license plate housing and bracket)
• keyless entry remote transmitter
• hood switch/bracket assembly

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Principles of Operation
Perimeter Anti-theft
The perimeter anti-theft feature provides an audible and visual alarm when unauthorized access to the vehicle is detected. When an intrusion is detected by any door or liftgate ajar switches, or the hood and trunk tamper switches it sends a ground signal to the GEM. When the GEM receives a signal indicating intrusion into the vehicle, the GEM supplies a ground signal to the horn control relay and the park lamps relay. The relay closes, supplying the power which activates the horn and the park lamps. The pulse stretcher module applies to wagons only. Due to the distance between the liftgate disarm switch and the GEM, the disarm switch signal is not present long enough for the GEM to recognize. The pulse stretcher module receives pulse input when switch is turned to unlock. The pulse stretcher module holds the pulse active for about 60ms so the GEM can recognize the signal and disarm the system. The perimeter anti-theft feature does not arm until 20 seconds elapses after locking the vehicle. The perimeter anti-theft device will disarm only when

• unlock is pressed on the keyless entry remote transmitter.
• keyless entry keypad code is entered.
• door, luggage compartment lid or liftgate lock cylinder is turned to unlock.
• ignition switch position changes to run or start.

Inspection and Verification

1. Verify the customer concern by operating the system.

1. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart Mechanical Electrical

• Lock cylinder disarm switches
• Hood switch
• Luggage compartment lid switch

• Loose or corroded connections
• Generic electronic module (GEM)
• Circuitry

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Door Disarm Switch Removal and Installation

1. Disconnect the battery ground cable. Refer to Section 414-01 .

1. Remove the door trim panel. For additional information, refer to Section 501-05 .

1. Remove the watershield.

1. Disconnect the latch lever from the door lock cylinder.
   1. Remove the E-clip.
   1. Disconnect the latch lever.

1. NOTE: The door disarm switch can be installed in more than one position. Before removing the switch from the cylinder it may be necessary to mark the position of the switch in relation to the lock cylinder.
   Remove the door disarm switch.
   • Disconnect disarm switch electrical connector.

1. NOTE: The door disarm switch can be installed in more than one position. Use the reference marks applied in the removal procedure to index the new door disarm switch to the lock cylinder.
   

lock with key,electric door lock button,or remote and alarm will set. to disarm you have to use the key or remote to open it.the reason it woulnt disarm from drivers door is either the door lock cylinder switch is broken or the wire to it in the rubber boot that connects the door and the body is broken.
the remotes are cheap and programing is easy,procedure in owners manuel something like lock drive door with elkect. lock switch with door open then push and hold unlock untill doors unlock then turn key off.you may have to fix that drive door lock cyl.switch first though mabee not dont know for sure

Intermittent door ajar switch contacts.

this is posted in your owners man. i think you need to pull the high beem switch back and then hit the door locks once for on and twice for off depends, i have a crew cab so they have more door unlock lock choices

Needs new drivers door lock actuator (P/N 3B1-837-015-AS)

you should be able to turn off alarm via key in drivers door if not test all doors to make sure they unlock. if any door will not lock that door latch will need replaced if work ok then try disarming alarm from trunk key or from the passanger door. if that works,you may need to have the key recoded to the car.