Question about 2003 Mercedes-Benz C-Class

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Front passenger door lock jumps up and down when locking car

This occurs when either using the ignition key on the automatic self locking that operates above 15kph

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  • frommontreal Apr 22, 2009

    lock jumps up and down too!!

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  • 241 Answers

You have a vacuum problem.
all your locking mechanisim works under vacuum lines, when you open one all open same if you close it all close.
try to unscrew lock tip a little bit like 1/4 of an inch and try it.
it locks also like the sensor is not detecting when it's lock or open.

Posted on Jan 08, 2009

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Posted on Jan 02, 2017

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The power door lock system consists of the following components:
• The driver door module (DDM)
• The passenger door module (PDM)
• The body control module (BCM)
• The driver information center (DIC)
• The rear door lock switch
• The door lock relay
• The door unlock relay
• The liftgate lock relay--utility vehicles with liftgate only
• The reversible door lock actuators in each of the doors and liftgate
• LOCKS 20A fuse (rear lock/unlock relay supply voltage)
• ECC 10A fuse (liftgate lock relay supply voltage .

Programmable Automatic Door Locks
The automatic door lock feature can be programmed to control the door lock system. The automatic door lock feature is factory programmed to have all doors lock and unlock. For detailed instructions on programming the automatic door locks, refer to Vehicle Personalization in Personalization.
When the automatic door lock feature is programmed to control the door lock system, the driver door module (DDM), passenger door module (PDM) and body control module (BCM) will lock the vehicle doors if the following inputs are true:
• Ignition 1 input is active.
• All door jamb switch inputs are inactive.
• Cargo door or liftgate/liftglass ajar inputs are inactive.
• Transmission is shifted out of park.
This automatic door lock function will only occur once per ignition cycle unless, a door jamb switch input changes state to active and back to inactive. Then the DDM, PDM and BCM will lock all doors again.
Once the automatic door lock feature has locked the doors, the BCM will then unlock all the doors when the transmission is shifted into park.
Driver, Passenger and Cargo Door Lock System Operation
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:
• The DDM (driver door lock actuator).
• The PDM (passenger front door lock actuator).
• 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.

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The doors lock automatically on my daughter's '99 Cougar. This has happened to me when I left the keys in the ignition and closed the driver's door. After AAA came and unlocked the doors, I removed the...


shorted wiring in doors or shorted door lock actuator in door. A grounding of a wire makes them lock normally. SO, any bare wire touching metal will ground it and lock the doors.

Principles of Operations
The Door Switch Lock Function When a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the central security module (CSM). The CSM then provides 12 volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors. The 12 volts that the CSM provides to the door lock actuators are provided to both door lock actuators from a single pin on the CSM electrical connector.
The Door Switch Unlock Function When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the CSM. The CSM then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which the unlocks the door(s). The 12 volts which the CSM provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the CSM electrical connector.
--------------------------------------------------------
CSM Self-Test The CSM has a self-test which can be entered into by using a diagnostic tool. This self-test will monitor the following CSM door lock inputs:
  • Unlock switch (DTC B1311)
  • Lock switch (DTC B1300)
  • Exterior lock switch (DTC B1309)
  • Exterior unlock switch (DTC B1341)
Before running the self-test, the following conditions must be met:
  • The ignition switch must be in position II
  • The driver and passenger doors must be unlocked
  • The driver and passenger doors must be opened
  • The hood and liftgate must be closed
  • The set/reset switch, and liftgate release switch are not actuated
It is important to note that all of the diagnostic trouble codes (DTCs), with the exception of B1551 and B1553 can be retrieved with the self-test. DTCs B1551, and B1553 are continuous and will only be retrieved if the liftgate release is operated prior to retrieving the continuous DTCs.
Inspection and Verification
  1. NOTE: Make sure that the battery is fully charged before starting electrical diagnosis.
    NOTE: Prior to carrying out the CSM Self-Test, make sure that both the driver and passenger doors are open.
    Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Binding latch mechanisms
  • Binding linkage
  • Misaligned door
  • Central junction box (CJB) fuse(s)
  • Wiring harness
  • Electrical connector(s)
  • Door lock switch(es)
  • Door lock actuator(s)


Module Controlled Functions
The central security module (CSM) covers the following functions:
  • Central door locking
  • Double door locking
  • Anti - theft alarm incorporating
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    • radio theft
  • Radio frequency remote control of
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    • panic alarm
    • driver door unlock
    • liftgate unlock
For additional information, refer to Section 419-01A Anti - Theft - Active, Section 501-14A Handles, Locks, Latches and Mechanisms, and Section 501-14B Keyless Entry/Computer Operated Locks.

The CSM is in the passenger side kick panel I think.

Good luck

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Hope this help :-)

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Here's what I suspect is happening. The door locks will lock and unlock normally when the key is OUT of the ignition. If the key is IN the ignition, the doors cannot be locked (manually, key fob, or otherwise, if the system is operating as designed - prevents the doors being locked when the key is in the ignition). I've seen this problem before, but on a Santa Fe, not an Accent. The ground signal of the right hand front passenger door was lost, and the doors automatically locked. Perhaps something similar is happening in the circuit between the ETACS module and the right front passenger door lock/unlock actuator. Could be anywhere in the circuit.



d05b136.gif
ab4c712.gif These wiring diagrams may be helpful. The relays expecially may help solve this issue. As you can see, these relays are also controled by the ETACS module (Remote Keyless Entry).

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Mar 31, 2009 | 2003 Hyundai Accent

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