Question about Mercedes-Benz C-Class
There is a harness conector under the seat make sure this is still conected
Posted on Aug 24, 2013
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Posted on Jan 02, 2017
Check with your local dealer or call me at 904-322-5150 my name is Adam. There may be an open recall that will solve your problem.. If so it can be fixed at no cost
Posted on Jan 06, 2009
There should be a connector under each seat which connects power to the heating element. It is likely either clipped to the seat or tucked under the carpeting. You'll almost definitely need to remove the seat to get easier access to it, though it should be possible to find/access it without removing it, just more difficult. Once you find it, disconnect it. You can use any multimeter with a continuity tester to test the circuit. First, check the DC voltage coming from the wires that come up from the floorboard. If you are getting voltage there, you will want to check continuity of the element itself by probing the two wires with the meter set to it's continuity testing selection. If there are more than two wires you will need to determine which is the common wire and which are the "live" wires. With the power disconnected you can test the element to figure this out easily. For example if your heated seat has three wires, test all three for continuity in pairs. If one wire always shows continuity no matter which other wires on the same plug you touch that should be common.
If the element tests good (in other words you find that all the circuits show continuity) and you are getting power from the plug that comes from the vehicle itself, you might need to check the resistance of the element. It is rare to have a bad element that still shows continuity, but it is possible that the resistance may have for some reason become lowered and the element therefore does not heat up.
Try these and let me know how it goes!
Posted on Jan 30, 2009
SOURCE: Heated seat
It is the heatling element, stock elements have a single wire snaked through the element and when the circuit breaks it is done, aftermarket elements have a wired grid that if one area fails it still works, they also spread a more even heat.
Posted on Oct 09, 2009
It is usually one of two problems. Either the relay under the seat has failed or the heat element in the seat has failed.
If you are not electrically challenged, you can use a simple volt-ohm meter and check for continuity in the heat element. If you have continuity, the element is good, otherwise that's your problem.
If the heat element is good, you may want to take the good relay from under the passenger seat and put it on the driver's side to see if that fixes it. If so, then you have to get a new relay.
Last, but very unlikely, would be a bad switch.
Posted on Jan 10, 2010
yes maybe a fuse, also look under the seat and ensure the wire is connected they sometimes get caught when moving the seat back and forward and split against the metal seat base.
Posted on Jan 16, 2010
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Mar 27, 2017 | Cars & Trucks
Passenger Front Door Module (PDM)
LH Rear Door Module (LRDM)
RH Rear Door Module (RRDM)
Driver Door Switch Assembly (DDSA)
RH Front Power Window Switch
LH Rear Power Window Switch
RH Rear Power Window Switch
LH Front Power Window Motor
RH Front Power Window Motor
LH Rear Power Window Motor
RH Rear Power Window Motor
Class 2 serial data circuit
Power door serial data circuit
PWR WDO 30 Amp Circuit Breaker
DRVMDL Fuse (10 amp)
Driver Door Switch Assembly and Driver Door Module logic, Driver Door Module internal driver operation
PASS MDL Fuse (10 amp)
Front Passenger Door Module logic and internal driver operation
RRDR MDL Fuse (10 amp)
Left Rear Door Module and Right Rear Door Module logic and internal driver operation
Do you know about computer controlled power windows ?
Power Windows Operation
The vehicle is equipped with power windows controlled by the door modules. Each passenger door window can be operated, either from a switch built into the driver door switch assembly (DDSA), or from a switch mounted locally to its associated door. The driver door window can be operated only from the driver door window switch built into the DDSA.
When a window is operated from the DDSA, the DDSA interprets the window switch signal as a specific window switch request and sends the information to the driver door module (DDM) via the power door serial data circuit. The DDM examines the request and checks to see if it has received any class 2 serial data messages from any of the other vehicle modules (i.e. ignition switch position) prohibiting the movement of the window. If the window being operated is the driver door window, and if no prohibitive class 2 messages have been received, the DDM then applies voltage and ground to the driver door window motor to move the window glass as requested. If the window being operated is a passenger door window, and no prohibitive class 2 messages have been received, the DDM sends the request, via the power door serial data circuit, to the appropriate passenger door module. The passenger door module then applies voltage and ground to the passenger door window motor to move the window glass as requested.
When a passenger door window is operated from the power window switch mounted locally to its associated door, the passenger door module first checks to see if the DDM has received any prohibitive class 2 serial data messages. If there are no prohibitive messages, the passenger door module powers the associated passenger door window motor.
Both front door windows have the express down feature. This allows the front door windows to be fully opened by momentarily pulling the appropriate window switch lever to the second detente and then releasing.
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