Ok boys and girls, step right in, class is about to start. I am sure most of you guys have read posts about windows not working or door locks not working properly. Today, we are going to learn how to fix those pesky door lock and window problems. At least as far as the control module goes. This is not to say there could be other problems, but this is how to fix the weakest part of the whole system, a bad relay. What I want to do is show you how to get to the control module and then identify which relays are for what function.
Required tools: Flat blade screw driver, number 15 and number 30 Torx drives, a fork like prying tool , (sorry I don’t know the proper name of this tool), soldering iron, solder sucker, and solder.
Step 1: Today, we are working on the passenger door. Remove the little plastic cover plate behind the door pull. It pops out with the screw driver.
Step 2: Using a number 30 Torx drive, remove the two screws that holds the door panel to the door.
Step 3: Using a flat blade screw driver, pry up on the window/door lock control panel. Lift up from the front as shown. Remove wiring connector and set the control panel somewhere safe.
Step 4: Using a flat blade screw driver, pop out the plastic piece that surrounds the door handle.
Step 5: Now, we are ready to remove the door panel.
Using the fork like tool
start at the rear of the door panel where the two halves meet.
Insert the fork like tool in and pry the panel away from the door. Work your way around to the front top part of the door panel. There are 6 pins that fit into little sockets in the door. Now, lift up on the door panel and remove it.
Step 6: Use a number 15 Torx drive and remove the two screws that hold the door control module in place.
Step 7: Remove the wiring connectors that attach to the door control module. Now, look at the edge of the enclosure and pop open the tabs that hold it closed and remove the circuit board.
Look at this last picture and it will show you which relay control the windows and door locks.
Step 8: After pre-heating your soldering iron, use the soldering iron and solder sucker to unsolder the 5 pins from the relay you want to replace. Everything on the circuit board is coated with a plastic film, you will have to use a small knife blade, or small blade screw driver, and cut around the relay before you try to pry the relay off of the circuit board. I found the same film on the solder side of the board as well. If you scrape off some of that plastic film before you apply the soldering iron, you will have better success at unsoldering the pins.
Step 9: After the relay is replaced, re-assemble everything. Be sure to note where the wiring connectors plug back into. The plastic housing is marked for the correct color of the wiring plug.
The Digi-Key part number for the door relay is
255-1240-ND and you can find it at
www.digiking,com. Last time I looked, they had 1100 in stock.
I hope this helps you guys that have intermittent door locks or you can hear a clicking sound but the window doesn’t go up or down. From start to finish, this project took me about an hour. Heck, it took me longer to do this write up than it did fixing my door lock.
C5 Door lock replacement
Linear Mode
