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Rear doors will not lock with switch - 2003 Chevrolet Avalanche

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Try replacing the lock/unlock relays. They will be located on the driver's side of the dash on the side when the door is open. These relays run the rear doors. Replace both while you are at it....I just had the same problem and replacing one would not do the trick. New part # is 1911-6058

Posted on Nov 27, 2009

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2002 Cadi Deville, can't get any locks to operate with remote or dash push buttons, the remote operates everthing but the locks! When the remote door lock is pressed, lites flash,horn blows locks not.


Power Door Lock Operation
The vehicle is equipped with power door locks. Each lock actuator is powered and controlled by the door module mounted in the individual door, but the rear integration module (RIM), which is the master control for the door lock system, determines when the lock functions are permitted. The RIM receives and examines the requested lock function from the individual door modules, or from the remote function actuator (RFA) via the class 2 serial data circuit. The RIM also examines the transmission shift selector position and the ignition switch position information available over the Class 2 serial data circuits. If the RIM determines that a lock or unlock function is permitted, it sends a class 2 message back to the individual door modules commanding them to perform that Lock or Unlock function.
Power Door Lock Components
The power door lock system consists of the following components:
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Driver door lock switch


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Passenger front door lock switch


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LH rear door lock switch


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RH rear door lock switch


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LH middle door lock switch (w/ V4U)


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RH middle door lock switch (w/ V4U)


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Driver door switch assembly (DDSA)


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Driver door module (DDM)


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Passenger front door module (PDM)


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LH rear door module (LRDM)


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RH rear door module (RRDM)


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Left middle door module (LMDM) (w/ V4U)


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Right middle door module (RMDM) (w/ V4U)


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Driver door lock actuator


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Passenger front door lock actuator


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LH rear door lock actuator


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RH rear door lock actuator


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LH middle door lock actuator (w/V4U)


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RH middle door lock actuator (w/ V4U)


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Driver door cylinder unlock switch


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Rear integration module (RIM)


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DRVMDL fuse (10-amp)


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PASS MDL fuse (10-amp)


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RRDR MDL fuse (10-amp)


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Class 2 serial data link

Sep 27, 2016 | 2002 Cadillac Deville

1 Answer

Passanger side doors wont lock


From where , any switch ? driver door switch or either passenger door switch . This is a very complex system controlled by modules (microprocessors)
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The driver door switch assembly (DDSA)


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The driver door module (DDM)


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The passenger door module (PDM)


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The rear door module (RDM)


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The LH front power door lock switch


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The RH front power door lock switch


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The LH front door lock actuator


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The RH front door lock actuator


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The LH rear door lock actuator


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The RH rear door lock actuator


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The remote control door lock receiver (RCDLR)


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The power door serial data circuit


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The class 2 serial data circuit


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The DRVMDL Fuse - 10 amp


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The PDM Fuse - 10 amp


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The RRINMDL Fuse - 10 a
Class 2 and Power Door Serial Data Links
The class 2 and power door data circuits are both serial data links. The serial data circuits replace cables in the vehicle by multiplexing (time-sharing) data to and from each device over a single wire referenced to ground. If the power door serial data is lost, both the rear door module (RDM) and the passenger door module (PDM) enters the sleep mode. With the RDM and the PDM in sleep mode, no power door operations are possible.
Your best bet is to take it to the dealer or an ASE certified repair shop .

Feb 20, 2016 | 2003 Buick Park Avenue

1 Answer

Why does my 2004 Chevy Silverado lock and unlock while in drive? When turned off and no keys in ignition the drivers door will unlock on its own a short time later.


Gremlins ! HA HA HA sorry ! First off a little bit on how they work an what all is involved in making them work ! There are a few control modules in the mix , switches ,relays etc...
Door Lock System Components
The power door lock system consists of the following components:
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The driver door module (DDM)

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The passenger door module (PDM)

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The body control module (BCM)

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The driver information center (DIC)

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The rear door lock switch

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The door lock relay

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The door unlock relay

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The liftgate lock relay--utility vehicles with liftgate only

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The reversible door lock actuators in each of the doors and liftgate

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LOCKS 20A fuse (rear lock/unlock relay supply voltage)

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ECC 10A fuse (liftgate lock relay supply voltage)

Door Lock System Controls
The power door lock system can be controlled by any of the following:
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A power door lock or unlock switch activation

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A keyless entry transmission

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An automatic door lock function

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A delay lock function

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Door lock cylinder switch activation

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Lockout Prevention

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An airbag deployment

The front power door lock switches are integral components of the driver door module (DDM) and passenger door module (PDM). The switches are two position normally open rocker switches. When placed in either the lock or unlock positions, the switches provide a direct input to the DDM or PDM. The DDM or PDM monitors these inputs and sends a Class 2 message indicating a change in the switch's respective position. Modules which activate the power door lock motors receive the Class 2 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 relays and also send a Class 2 message to the DDM and PDM to perform the appropriate function.
The modules which activate the power lock motors are:
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The DDM (driver door lock actuator).

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The PDM (passenger front door lock actuator).

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The BCM (both rear door lock actuators and cargo door/liftgate).
The DDM and PDM 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 cargo doors differ slightly in that they use lock and unlock relays. The relays supply and coil sides receive a constant voltage through the battery voltage supply circuit. The normally closed contacts are connected to ground and the control side is connected to the BCM. Once a door lock or unlock request has been received by the BCM, the BCM will ground the control side of the appropriate relay. This energizes 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.
The first place to start is have a factory or equivalent scan tool hooked up , one that can read BCM DTC'S - diagnostic trouble codes ! This could lead to a fix faster ! Watch these three videos !
Door Locks Go Crazy 1

Sep 16, 2015 | Cars & Trucks

2 Answers

Why won't rear passenger door unlock with auto lock switch?


latch may be damaged /gummed up --or lock rod/retaining clip damaged or disconnected you will need to remove the door panel to inspect the lock unit

Aug 09, 2015 | Lexus RX 300 Cars & Trucks

1 Answer

Both rear electric door locks are malfunctioning. Drivers side rear door lock works good when it is cold. the same was true with the passenger rear door lock. now that one will not work at all. the...


to see if it is a switch problem see if the locks work from their respective doors, if the locks work from the switch's on the back doors and not from the drivers switch then the drivers switch is bad. If the locks don't work right from any of the switches then the door lock solenoids are bad. the solenoids are not too hard to change if you are mechanically inclined, switches are not too hard either

Feb 09, 2014 | 2008 Chevrolet Impala

1 Answer

I have power to the door lock switches on the drivers door but the locks do not work nor does the back hatch or the switch at the back hatch that controls all the locks in the vehicle. Do the locks g


Power Door Locks Circuit Description
The power door lock system incorporates door lock switches on both front doors and on the RH D-pillar, door lock motors in all passenger doors and in the RR cargo door, a door lock relay and a door lock control module.
Power for the door lock switches and the door lock control module is supplied from the CIG LTR fuse 13 through CKT 640 (ORN). Power for the door lock relay is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN). Ground for the door lock relay is supplied from G202 through CKT 150 (BLK) and ground for the door lock control module is supplied from G400 through CKT 150 (BLK).
The door lock motors are reversible and both sides are connected to the normally closed contacts of the door lock relay. Those contacts of the relay are connected to G202. When any of the door lock switches are placed in the lock position, voltage is supplied through CKT 195 (LT BLU) to the relay lock coil. Since the other side of the lock coil is connected to ground, the coil is energized and it pulls the lock contacts closed. Voltage is then supplied through CKT 295 (GRY) to all the door lock motors and the doors lock. The unlock function operates in much the same manner except that when any of the switches are placed in the unlock position, voltage is supplied through CKT 194 (WHT) to the unlock coil of the relay and CKT 294 (TAN) supplies voltage to the apposite side of the door lock motor and the doors unlock.
Door Lock Control Module Description
The door lock control module is used on vehicles equipped with cargo doors. The purpose of the module is to lock the cargo doors after a lock cycle has been commanded from any of the door lock switches with the cargo doors open. When the RH cargo door is open, the module receives a ground signal from the closed contacts of the rear door jamb switch on CKT 1897 (ORN/BLK) to G400. When a lock command is received, the module retains this input until it receives an open input from the rear door jamb switch. Then the module sends a lock command through CKT 194 (WHT) to the door lock relay and the doors lock.
Rear Cargo Doors Description
The power door lock motor will not operate unless the rear cargo doors are fully closed. The power door lock motor is in the right cargo door. The contactors are on the rear cargo door opening on the body and on the right cargo door.

May 23, 2017 | 1997 GMC Yukon

1 Answer

Rear door lock won't lock or unlock on 2006 chevy colorado


could be door acuator switch. remove rear door cover follow rear door lock rod it will lead you to the lock motor check power plug make sure its its cliped in some times they come loose.next if plug is tight get a test lite chech see if you have power to lock motor have a friend move master switch up and down while youcheck for power mostlikely the switch is no good.

Apr 10, 2010 | 2006 Chevrolet Colorado

1 Answer

2001 Toyota Sienna r.h. sliding door ''rear latch switch'' location


To start, the noun "''rear latch switch'' is incorrect. It's actually called "Slide Door Lock". It's located on page BO-20 of the Toyota Repair Manual for the 2001 Sienna. There are two door locks on one sliding door. One in the front and one in the rear. Obviously, you want the one in the rear. The location for the "Slide Door Lock" (which also contains an electric switch) is in the rear of the sliding door located mid way up door. You can see (sliding door opened from the back) it without dissembling the door. And, the lock is made up of plastic (dirty white in color).

Mar 06, 2010 | 2001 Toyota Sienna

1 Answer

2003 Chevy Avalanche rear doors won't lock automatically


The rear doors will not lock with the keyless remote, the drivers master switch

May 27, 2009 | 2003 Chevrolet Avalanche

1 Answer

Chevrolet 2500 crewcab - rear door auto lock shut off


try punching the remote lock button twice. experience with 4 door s-blazers shows that it has to be done twice to lock all 4 doors. also look for "child safety" switched for the rear doors that may be disabling remote locking for the rears.

Feb 18, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

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