Door sensor and lock issues
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1st Gear
Joined: Mar 2021
Posts: 1
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Door sensor and lock issues
Taken on fixing my dads P38 4.6 HSE 1997 for him.
Thoughts on this one so I can get his truck back on the road, reliably.
In order of faults as I found it over some weeks.
NB RHD Australian car.
Noticed the battery would go flat overnight. Would be fine for several days, a week then randomly dead.
As the car is moving off from stopped, the error LH-R door not closed. Door is closed and locked.
Took door card off and checked the 6 way plug. Meter confirmed no broken wires.
Plugged in and LH-R error gone and it moved to LH-F door not closed.
LH-R door no longer locks or unlocks with key fob.
Interior lights stay on.
If I lock the LH-F door before driving off all errors are gone.
Lock with drivers door, all lock (except LH-R) and it errors with LH-F not closed. BUT the doors are locked (except LH-R)
If I lock up for night using the key fob, all doors lock (except this problematic LH-R) and interior lights stay on.
If I lock up for night, accessing from LH-R, lock the truck by pushing LH-F door lock plunger all doors lock (except LH-R), I then manually lock LH-R, close the door, all interior lights fade as expected, next day, dead battery.
Checked battery for drain, shows 1mA.
Disconnected the battery for a day and when reconnected, truck started perfectly. I will be getting a battery check just to be sure.
What am I chasing if anyone has ideas, appreciate it.
Thanks
Ray
Thoughts on this one so I can get his truck back on the road, reliably.
In order of faults as I found it over some weeks.
NB RHD Australian car.
Noticed the battery would go flat overnight. Would be fine for several days, a week then randomly dead.
As the car is moving off from stopped, the error LH-R door not closed. Door is closed and locked.
Took door card off and checked the 6 way plug. Meter confirmed no broken wires.
Plugged in and LH-R error gone and it moved to LH-F door not closed.
LH-R door no longer locks or unlocks with key fob.
Interior lights stay on.
If I lock the LH-F door before driving off all errors are gone.
Lock with drivers door, all lock (except LH-R) and it errors with LH-F not closed. BUT the doors are locked (except LH-R)
If I lock up for night using the key fob, all doors lock (except this problematic LH-R) and interior lights stay on.
If I lock up for night, accessing from LH-R, lock the truck by pushing LH-F door lock plunger all doors lock (except LH-R), I then manually lock LH-R, close the door, all interior lights fade as expected, next day, dead battery.
Checked battery for drain, shows 1mA.
Disconnected the battery for a day and when reconnected, truck started perfectly. I will be getting a battery check just to be sure.
What am I chasing if anyone has ideas, appreciate it.
Thanks
Ray
TReK
Joined: Sep 2020
Posts: 2,956
Likes: 754
From: British Columbia Canada
I think your battery going flat is related to the door issue. You can try electro contact cleaner on the door switches (door cards need to be removed). I hate to send you to another forum but rangerovers.net has a lot of P38 experience.
Winching
Joined: Aug 2019
Posts: 602
Likes: 164
From: Charlotte, NC
Sounds like you have an issue with the door actuator.
Inside the actuator on the drivers side there are 3 microswitches. These are like small buttons. The P38 door actuator microswitches are known to go bad. The rubber boot that covers each microswitch rips.
For the drivers side there are 3 levers inside the actuator. One for each microswitch. One presses the button when the key is used to unlock the door. A second lever presses a microswitch with the inside door sill is used to lock or unlock the door. The third lever presses a microswitch when the door is closed. That microswitch may be broken and therefore the computer is not getting the signal the door is closed and causing the issues.
Inside the actuator on the drivers side there are 3 microswitches. These are like small buttons. The P38 door actuator microswitches are known to go bad. The rubber boot that covers each microswitch rips.
For the drivers side there are 3 levers inside the actuator. One for each microswitch. One presses the button when the key is used to unlock the door. A second lever presses a microswitch with the inside door sill is used to lock or unlock the door. The third lever presses a microswitch when the door is closed. That microswitch may be broken and therefore the computer is not getting the signal the door is closed and causing the issues.
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