98 Chev Blazer. power lock problem. driver's door would not unlock doors, now it will not lock doors. passenger side works fine

need to remove the door panel and check the clips that connect to the locking rods possiblr damaged or disconnected

Pull the door panel and find the cause, it can be a faulty lock motor or the linkage rod has come off due to a broken retainer clip.

Do the power windows work ? DDM - driver door module fuse 15 amp - location is the instrument panel fuse box , plus LT DR circuit breaker 25 amp. Circuit breakers rarely go bad . The power locks are controlled by electronic's .The passenger side has another power supply ,that's why they still work .
Door Lock System Components
The power door lock system consists of the following components:
• The driver door switch (DDS)
• The passenger door switch (PDS)
• The body control module (BCM)
• The driver information center (DIC)
• The rear door lock/unlock relay (LBEC)
• The reversible door lock actuators in each of the doors and liftgate

The front power door lock switches are integral components of the driver door module (DDS) and passenger door module (PDS). The switches are 2 position normally open rocker switches. When placed in either the lock or unlock positions, the switches provide a direct input to the DDS or PDS. The DDS or PDS monitors these inputs and sends a LAN message indicating a change in the switch's respective position. Modules which activate the power door lock motors receive the LAN message and activate the motor in the appropriate direction to lock or unlock the vehicle's doors and liftgate. The rear door lock switch provides a lock and unlock signal to the body control module (BCM). The BCM upon receipt of a lock or unlock signal will control the rear door lock/unlock relay and also send a LAN message to the DDS and PDS to perform the appropriate function.
The modules which activate the power lock motors are:
• The DDS (driver door lock actuator)
• The PDS (passenger front door lock actuator)
• The BCM (both rear door lock actuators and cargo door/liftgate)
The DDS and PDS are directly connected to the respective door lock actuator through the door lock motor lock and unlock circuits. Once a door lock or unlock request has been received, the module will supply battery voltage to one side of the actuator and ground the other causing the doors to lock or unlock.
The rear passenger and endgate doors are controlled by the BCM through the rear door lock/unlock relay which is incorporated onto the printed circuit board in the LH BEC. The BCM controls the unlock relay by providing ground to energize the coil and controls the lock relay by providing battery voltage to energize the relay coil. The energized the relay and allows voltage to be applied to either the door lock motor lock or unlock circuits. Since the other side of the door lock actuator is connected to the normally closed contacts of the opposing relay to ground, the doors lock or unlock.

It's possible you have broken wire or wires inside the flex boot from the body of the vehicle to the driver's door . This happens a lot .
Fuse Block - I/P instrument panel
Left of the I/P behind the side trim panel

both the rear passenger side wont unlock ???? How many doors are on the passenger side ? Or both back doors don't unlock ? Two relays lock / unlock the back door's Not the lift gate . The BCM controls the relay's . The relay's are located in the rear fuse box . Under back seat .

the wires between the door and the pillar may have cracked and create the short. its from swinging the door open and closed position in time. Some will do this mainly on the right side for the harness is so tighter from being shorter that the left side is. I had seen this happen in many Chrysler vehicles

have you tried locking from the passenger side switch? alot of times if a window is left down during the rain, water will run in on drivers side and right down into the power window and lock switch causing it to corrode inside over time.

SOUND LIKE THE DRIVERS DOOR LOCK SWITCH IS STUCK IN THE UNLOCK POSITION. SINCE THE DRIVERS DOOR LOCK SWITCH OVER-RIDES THE PASSENGER DOOR, I WOULD REPLACE THE SWITCH WITH A NEW ONE. HOPE THIS SOLVES THE PROBLEM. GOOD LUCK. KEEP US POSTED, WE ARE ANXIOUS TO KNOW.

check fuses & switches

try taking apart and cleanig all contacts first. make sure you are getting power to switch. Sounds more switches are going bad. They usually last about 5 to 7 years before they start going out.

your lock acuteuator is stuck replace it and you should be fine