C class 203 passenger door not opening with remote control all other doors working

if you have remote start on fob need dealer to program ---also need the correct fob not a universal type

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

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 .

take to dealer system is hard to diag even with all info at hand because each door and window has sensors that send singals to a body control that processes and then lets work.

Power Windows Operation
The vehicle is equipped with power windows controlled by the door modules. Each passenger door power window can be operated, either from a switch built into the driver door switch assembly (DDSA), or from a switch mounted locally on its associated door. The driver door power window can only be operated from the switch built into the DDSA.
If the driver door module (DDM) receives a window switch request from any of the window switches built into the DDSA, the DDM checks the Class 2 serial data to see if conditions are correct (i.e. ignition switch position) to permit window operation to occur. If conditions are correct, the DDM, either supplies power and ground to its associated window motor, or sends a command via the power door serial data line to the passenger door module controlling the window. The passenger door module controlling the window then supplies power and ground to its associated window motor to move the window as requested.
When one of the local window switches mounted on one of the passenger doors is operated, the associated passenger door module examines the request and checks to see if there are any messages from the DDM prohibiting the window operation. If conditions are correct, and no prohibitive messages have been received from the DDM, the associated passenger door module then supplies power and ground to its associated window motor to move the window as requested.


Class 2 data network wires under the carpet behind driver seat. Water shorts out the network an and it won't work .
your looking for tan/white wire's and a connector . This is where the problem is .

Who looked at it ? Dealer ? Did the place's you had look at the vehicle hook up a factory scan tool an view data to door module's an the BCM ? Door ajar is a fuction of the door modules an the BCM - body control module . One of these modules is seeing an input that makes it think door is open .
The door ajar indicator system consists of the following components:
• The driver door module (DDM)
• The passenger front door module (PDM)
• The body control module (BCM)
• The instrument panel cluster (IPC)
• The driver information center (DIC)
• The driver door ajar switch
• The passenger door ajar switch
• The left rear door ajar switch
• The right rear door ajar switch
• The liftgate ajar switch

Driver Door Ajar And Passenger Door Ajar
The DDM and PDM receive a discrete input from the respective door ajar switch to indicate the status of the door. The DDM or PDM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:
• The transmission is removed from PARK
• The vehicle speed is greater then 8.05 km/h (5 mph)
Left Rear Door Ajar And Right Rear Door Ajar
The BCM receives a discrete inputs from both the left and right rear door and liftgate ajar switches to indicate the status of the doors and liftgate. The BCM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:
• The transmission is removed from PARK
• The vehicle speed is greater then 8.05 km/h (5 mph)

Could have DTC'S - diagnostic trouble codes . Looking at data paramiters on the scan tool tool would show what switch is faulty or what part is .

child safety locks or bent linkage ?

REPLACE REMOTE e/ Dealer

If remote locks and unlocks driver door but does not unlock passenger doors,then follow the advice above:
Get in the car using the key to unlock the doors. From the passenger side lock and unlock your doors using the button on the passenger door. Get out and the remote should now unlock all the doors with 2 presses.
Worked perfectly for me after several other suggestions (and dealer) failed.