Doors don't lock while in drive or unlock when i put it in park. 2003 chevy malibu.

Do they work with the key fob, do you have one of those? They lock when put into gear an unlock when put into park because the BCM - body control module does that .

Door Lock System Components
The power door lock system consists of the following components:
• Driver door lock switch
• Front Passenger door lock switch
• Body Control Module (BCM)
• Relays: Driver Door Unlock -- on vehicles with RFA, Door Unlock, and Door Lock
• Door Lock fuse 15A
Door Lock System Controls
The power door lock system can be controlled by any of the following:
• A power door lock switch activation
• A keyless entry command -- if equipped with keyless entry


Driver and Passenger Door Lock Operation
When any of the door lock switches is pressed to the lock position, the BCM door lock/unlock signal circuit changes from an idle voltage of ~3.4 volts to 0.0 volts generating a lock command. The BCM then applies battery positive voltage to the Door Lock Relay, which in turn applies battery positive voltage to the Door Lock Actuator lock circuit of all the Door Lock Actuators. Since the Door Lock Actuator unlock circuits are held to ground through the resting Door Unlock Relay(s), the actuators execute the lock command, locking the doors.
The lock function can also be accomplished by the BCM having received a keyless entry door lock command, if the vehicle is equipped with keyless entry.


Driver and Passenger Door Unlock Operation

When any of the door lock switches is pressed to the unlock position, the BCM door lock/unlock signal circuit changes from an idle voltage of ~3.4 volts to ~1.7 volts generating an unlock command. The BCM then applies battery positive voltage to the Door Unlock Relay and the Driver Door Unlock Relay when equipped with keyless entry, the relay(s) in turn apply battery positive voltage to the Door Lock Actuator unlock circuit of all the Door Lock Actuators. Since the Door Lock Actuator lock circuits are held to ground through the resting Door Lock Relay, the actuators execute the unlock command, unlocking the doors.
The unlock function can also be accomplished by the BCM having received a keyless entry door unlock command, if the vehicle is equipped with keyless entry. Keyless entry personalization allows the driver door to be unlocked individually before unlocking the passenger doors. When this feature is active, the BCM will require a repeated unlock command to unlock the passenger doors.


Automatic Door Lock/Unlock
The automatic door lock/unlock function is a Vehicle Personalization feature with the following four programmable modes of operation:
The automatic door lock feature is disabled.
All of the doors lock when the vehicle is shifted out of Park with the ignition ON.
All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and all of the doors Unlock when the vehicle is shifted into Park.
All of the doors lock when the vehicle is shifted out of Park with the ignition ON, and only the driver door Unlocks when the vehicle is shifted into Park.
For information on programming the automatic door locks, refer to Vehicle Personalization in Personalization.

Lock an unlock by them selves ? Door locks are computer controlled ,by the BCM - body control module .
--------------------------------------------------------------------------------
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

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

The locks on your vehicle are electronically controlled by the BCM - body control module . The driver an passenger door switche's are input's to the BCM . Do you know anything about automotive electronic's ? anti theft alarm remote, could this be part of the problem , No it's just a key less entry remote , nothing to do with the anti-theft .
Door Lock System Components
The Power Door Lock System consists of the following components:
• Body control module (BCM)
• Driver door lock switch
• Front passenger door lock switch
• Door lock actuators in each of the doors
• IBCM (PWR) 15-amp fuse

Door Lock System Controls
The Power Door Lock System is controlled by the body control module (BCM) and can be activated by any one of the following:
• A door lock switch Lock or Unlock actuation
• A keyless entry transmitter actuation
• An automatic door lock actuation
• An automatic door unlock actuation
• A last door closed locking (LDCL) actuation

Driver and Passenger Door Unlock Operation w/o Keyless Entry
When the body control module (BCM) detects a transition of either of the door lock switches to the Unlock position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the driver passenger door lock actuators transition to the Unlock position.

Your best bet , take your vehicle to a qualified repair shop ! Need special tool to diagnose .

Power Door Locks Inoperative

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the door lock switch parameter in the Doors data list.
Does the scan tool display Idle?
YES - Go to Step 4
NO - Go to Step 8
4
Activate the driver door lock switch to the LOCK and UNLOCK positions.
Does the scan tool display Idle?
YES - Go to Step 9
NO - Go to Step 5
5
Activate the front passenger door lock switch to the LOCK and UNLOCK positions.
Does the scan tool display Idle?
YES - Go to Step 9
NO - Go to Step 6
6
With a scan tool, observe the driver door lock actuator command and the passenger door lock actuator command parameters in the Doors data list.
Activate a door lock switch to the LOCK and UNLOCK positions.

Try pressing the unlock button twice

on some of the GM lock glitches the passenger side lock switch is faulty

Trunk Lock After Closing
--------------------------
Desc.: What happens to the trunk lock when closing it.

Settings:
Yes: Automatically lock Boot on closing
No: Boot can be reopened using micro switch button located on the trunk/boot

* Trunk Lock After Drive Off
----------------------------
Desc.: Should the trunk be locked at drive off or after 30 sec.?

Settings:
Yes: Trunk/Boot will automatically lock when vehicle increases speed
No: Trunk/Boot will remain closed, however will be in the unlocked
condition if No was selected in the previous option.

* Door & Trunk Unlock at Key Out
--------------------------------
Desc.: When the is removed from the center console should door/trunk
be unlocked?

Settings:
Yes: All Doors & Trunk/Boot will Unlock when the Key is removed from
the Ignition Switch If Driver frequently locked all Doors when
driving
this feature would be beneficial.
No: Doors and Boot will remain in the same condition as they were
prior
to Key removal

* TSL Locking Logic (Theft Security Locking/Deadlock)
-------------------
Settings:
TSL at first Press: Default Setting. All Doors will lock in Deadlock
Mode
TSL at Second Press: All Doors will lock in Deadlock mode at the second
press of the Remote.

* Lock /Unlock Acknowledge
--------------------------
Settings:
None : No acknowledge will be visible
Indicators: Indicators will blink as acknowledge

* Follow Me Home Function
-------------------------
Settings:
Tail Light: When selected Tail Lights will be illuminated
Back Up Light: When Selected Reverse Light will be activated


Tech 2 Body Exterior Lighting & Horn
====================================

* High Beam Follow me home Active Time
--------------------------------------
Desc.: Follow Me Home Active Time can be adjusted between 0- 10 minutes

Settings:
This Feature can be turned on or Off .Yes / No can be selected.
Low Beam Automatic / Low Beam also in Position 0 (light switch)
Yes / No
Follow Me Home Active Time
- Daytime Driving Lights can be activated

* Parking Lights
----------------

Settings:
Act as Lead Me To the Car Light.

* Park Light On Reminder
------------------------
Settings:
On / Off
If Ignition is turned Off and the parking lights are active, Driver will
be warned if set to on.

* Show Trailer Light Outage
Desc.: REC will detect blown trailer light and display on SID

Settings:
Yes or No

* Trailer Light / Fog Light off
-------------------------------

Settings:
Yes: Fog Light Rear will be disabled When Trailer is connected Yes
No

* Horn Lock Unlock Acknowledge
------------------------------
Settings:
On: Horn will honk when car is locked
Off: Horn will not honk if car is locked


Tech 2 Body Locking
===================

* Panic Alarm Activation (Vehicles fitted with /Alarm only)
-----------------------------------------------------------
- Panic Button / Locking Switch
Central Locking Switch Driver /Passenger

Settings:
- Panic Button on Remote and locking switch inside vehicle will
activate alarm
- Panic Button will activate Alarm only
- Locking Switch inside vehicle (driver /passenger will activate
alarm only
- No Panic Alarm function required.

* Unlock Logic
--------------
Settings:
All at first press : All Doors will open & Fuel Lid will unlock if the
Driver or Passenger Door Switch is activated
Driver Door & Fuel Lid at first press : Only the drivers Door will unlock
& Fuel Lid will unlock when door
switch is activated

* Remote unlocking One Press
----------------------------
Settings:
All at first press: All Doors will open & Fuel Lid will unlock if the
Remote is pressed
Driver door & Fuel Lid at first press: Only the drivers Door will unlock &
Fuel Lid will unlock when the Remote
is pressed

Intermittent door ajar switch contacts.

check wiring going to door there is a black rubber boot going to door wires have rubbed to a short. roll windows up and down if locks start working thats the door to check If one of your door locks don t work, check wiring