Driver's side door lock will not lock

Hi,

As far as the lock, are you able to lock it manually or is it jammed? If you can do it manually, then it's likely the actuator is bad. The only way to confirm (in this case since you hear a buzzing) is to remove it and see if it actuates. Since you hear it, we know it's getting power.

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Here are the directions for the removal and replacement of the actuator. The pics attached correlate with the directions.

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2002 Chevy Truck S10/T10 Blazer 4WD V6-4.3L VIN W
Lock Actuator Replacement - Front Door
Vehicle Body and Frame Locks Power Locks Power Door Lock Actuator Service and Repair Removal and Replacement Lock Actuator Replacement - Front Door
LOCK ACTUATOR REPLACEMENT - FRONT DOOR
Lock Actuator Replacement - Front Door

Removal Procedure

1. Remove the door trim panel.
2. Remove the water deflector.
3. Remove the door latch assembly.

Pic 1

4. Remove the 2 screws (2) that retain the lock actuator (1) to the latch.

Pic 2

5. Simultaneously lift up on and rotate the actuator away from the latch in order to disengage the rubber bumper (1) from the latch.
6. Remove the actuator from the latch.

Installation Procedure

pic 3

1. Install the rubber bumper (1) to the latch.
2. Rotate the actuator toward the latch in order to fully engage the rubber bumper into the latch.

Important: Ensure that the first tooth of the gear on the actuator and the first tooth of the gear on the latch align and interlock properly.

Pic 4

3. Install the actuator to the top of the latch.

Pic 5

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the 2 screws (2) that retain the actuator (1) to the latch.

Tighten the screws to 0.75 N.M (6 lb in).

5. Install the latch to the door.
6. Install the water deflector.
7. Install the door trim panel.

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Let me know if this helps or if you have other questions.

Take care,
Joe