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There is a sequence of left and right turns of the key in the driver's door that will reset your bECM (Rovers brain) if the following have been tried.
1. Replace batteries in remote and 're-sync by depressing lock button on remote while physically turning and locking the door. Don't release button until locked and key removed. Repeat for unlock button.
2. Disconnect negative/earth cable from battery. While disconnected open driver's door, turn ignition to position 2, return to battery leaving driver's door open and reconnect the negative cable. Proceed to ignition. Turn off completely. Close all doors and hood and attempt starting.
Should both of these methods fail, run a search here on fixya for "engine disabled Range Rover P38" This will take you to step by step instructions on resetting the bECM which I opened this post with. It has been covered many times here, including by myself, no reason to post it again.
Looks like that you have a faulty door lock actuator that's why it's not responding with the remote. If the actuator is faulty it tends to trip, sometimes will open sometimes won't. Using the key will surely lift the locks upward and by then the actuator can work again.
Have the door lock actuator replaced and you'll be good.
Hope this helps and thank you for using FixYa! Have a good one!
If the door locks are not working they might have ice inside. If you use a hair drier to blow warm air on the affected lock it might free it up. Do not use a heat gun as it will most likely damage the paint. Also, a good quality lock lubricant can help a lot. I have used "Lock-Eze", which is graphite based and sold by Napa auto parts.
With the drivers window down, and the doors closed. and locked connect the battery and lock and unlock the tailgate with the key, you need to unlock it twice to unlock the doors and turn off the alarm. If the locks are working like thier supposed to the drivers door will be unlocked and opening it won't set off the alarm. the truck should be back to normal. If not disconnect the battery again. Drivers window down. Put the key in the switch and turn the key on to the run position. With all the doors closed connect the battery. connect it good and don't bounce it around. If the battery casbles aren't clean clean them good so it'll connect good. If it still is alarming then the doors switches are likly. Or the door locking motors. You should be able to lock all the doors ( including the hatch) by hand and get the system to reset. Try it all again using a different door to double unlock as a lock switch might be sticking. If the system can't verify that all the doors are closed and locked it won't reset. If you connect the battery wihg the key turned on the system thinks it's already running and appeares to be in the unset mode.
unlock with key and hold key over for 30 secs(windows may go down)then lock with key and hold over for 30 secs(windows may go up)then press remote unlock button and hold for 30 secs,you have just reset system...the closer you have to get to the car for the remote to work the lower the battery power.sensor on top of dash(little black dimple)rarely,if at all, goes wrong.....
Unfortunately, there is a trick to replacing the battery.
1) Open the Driver side door.
2) Open the Bonnet and take the battery cover off.
3) Use your remote to lock and unlock the car (keeping the driver side door open)
4) Pull the Negative Lead from the battery first, followed by the Positive Lead.
5) Change or replace with charged battery.
6) Closed down Bonnet.
7) Your windows, sunroof, and key FOB will not work... so follow the next steps.
7a) Insert your key, with door closed into the exterior lock on driver's side.
7b) While turning the key to lock the door, hold down the "lock" button on your remote for 5 seconds while in "lick" position
7c) Your remote will reset, and you should be able to use your remote now
7d) While driving, roll each window down twice. On your third attempt, you should only have to touch the window button, and the window will have reset
Programming When Key batteries completely discharged. Key batteries not replaced within 60 seconds. Key added or replaced. DO NOT press remote control buttons during battery replacement. How Unlock vehicle. Enter vehicle. Close driver's door. Switch ignition ON and OFF. Remove ignition key. Press and hold unlock button Fig. 1 . Press lock button Fig. 1  briefly 3 times within 10 seconds keeping unlock button  depressed. Release unlock button Fig. 1 . Some models: LED Fig. 1  flashes slowly for 10 seconds. Some models: Central locking system locks and unlocks rapidly to indicate correct programming. Some models: Repeat above procedure if central locking system does not work and LED does not flash or LED flashes continuously
To change batteries remove panel back of key then screws on plastic bar
Batteries are available from your local motor factor shop
You might not need new batteries try re programing as described above
battery of car is zapped of energy...not sure if alarm system to blame, after driving it for a few minutes..clock and radio display lights turn off, horn can barely be heard...sometimes, motor shuts down completely. have had to put in 2 new batteries in just a matter of 2 months?...any idea what this may be?
WHAT FOLLOWS IS THE CORRECT PROCEDURE, REMEMBER YOU MUST COMPLETE THE 8 KEY CYCLES IN LESS THAN 10 SECONDS, IF YOU DO IT RIGHT THE POWER LOCKS WILL GO UP AND DOWN TO INDICATE IT IS READY FOR PROGRAMMING.
1.Turn ignition from OFF to RUN 8 times within 10 seconds, with the 8th time ending in RUN. Door locks will cycle to confirm programming mode. 2. Within 20 seconds press any button on first keyless remote. Door locks will cycle to confirm programming. 3. Within 20 seconds, press any button on second keyless remote. Door locks will cycle again to confirm programming. 4. Turn ignition to OFF. Locks will again cycle to indicate end of programming mode.