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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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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Door Lock System Components
The Power Door Lock System consists of the following components:
• Body control module (BCM)
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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:
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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.

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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?
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Activate the driver door lock switch to the LOCK and UNLOCK positions.
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The ignition lock cylinder contains spring loaded contacts which make physical contact with the ignition key when it is inserted into the ignition lock cylinder. This allows the ignition lock cylinder to provide the Body Control Module (BCM) (2) with the resistor code embedded in the ignition key.

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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.
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Hope this help :-)

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1 Answer

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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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