Thread: Repair electric window faults in Discovery 1 ( ECU )

Fault: Electric windows (usually rear) in Discovery 1 do not work, whether using the console or door switches.

Difficulty: Not very. I've successfully completed this repair myself so anyone can do it !

Things to check first:

A. There is a 'lockout' button on the console to stop children from winding the windows up and down. Ensure this is not pressed, jammed or sticky.

B. Check the fuses. Open the fuse panel (drivers foot well underneath the steering wheel) using a coin or flat screwdriver. There are many fuses ! In the top RH corner there should be two x 30A fuses. There is one for the front windows and one for the rear. Fuses OK? Never mind, keep going !

C REPAIR

Tools: Torch, Hex head socket (7mm), soldering iron, flat blade screwdriver.
Consumables: Solder.
Caution: It is always good practice to disconnect the battery in a vehicle when doing electronic work, to avoid shorting.

1. Remove the 4 x 7mm bolts at the bottom of the glove box.

2. Open the glove box, lift the 'control arms' out of their slots and remove the glove box.

3. Locate the window ECU case, beside the ABS module (if fitted). It's over toward the far left hand side.

4. Have you disconnected the battery? Good.

5. Remove the two plugs from the front of the control unit.

6. Carefully pry the edges of the case of the control unit away, so that you can slide the circuit board (the 'ECU' itself) toward you.

7. Again carefully remove the circuit board. Typically Land Rover haven't angled it to slide out easily, some jiggling might be required. Printed circuit boards CAN break so take your time.

8. Once you have removed the circuit board, take a close look for dry joints. Keep reading even if none are evident.

9. With a hot soldering iron re-wet the dry joints (that is, ensure there is a good soldered connection). If no dry joints are evident it may pay to re-wet as many of the joints as you can. Care: Don't let solder run excessively and join parts of the board that should not be !

10. Don't replace the board into the vehicle yet but do plug the cables to the board. Ensure that there is no contact between the circuits and any metal on the vehicle, ideally by wrapping the board in an insulating material.

11. Re-connect battery.

12. Ignition to ON and check the functioning of the windows, all 4 of them. If the Land Rover gods are smiling on you, the repair will have worked. If not, ensure that the plugs are pushed fully home in the ECU sockets. Check again. Good now?

13. Now disconnect the battery again, and for the same reason noted earlier.

14. Unplug the circuit board, refit it into its housing, and refit the plugs. Again, ensure the plugs are pushed fully home in the sockets.

15. Re-connect the battery, Test again, and if all good, refit the glove box.

16. Drink a congratulatory beer.

What if this didn't work?
- Drink 4 commiseration beers.
- Post a thread on aulro.com and ask for help.

The following video (not mine, found on YouTube) is an excellent instructional video (though be gentler with the plugs than he says) and is a MUST WATCH before doing the job. It really will make the above seem less difficult than it may sound.

[ame=http://www.youtube.com/watch?v=kt6odNB3c8s]Land Rover ECU Repair - YouTube[/ame]

Good luck !




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Very useful info