The boot always opened OK with the button on the boot or the button on the dash, as well as via the keyfob.
I had to disconnect the RCCM recently and then noticed that the boot only opened via the keyfob.
Reconnected the RCCM and the boot still only works via the keyfob, not by any buttons anymore.

What have I done?

 

Strange issue. I'd say check the fuse, but I don't think there would be a separate fuse for that. Try a battery disconnect?

 

Check electrical connection to the electric boot release in the trunk.

 

Hi chaps. Got it sorted last night at midnight and you will never guess what it was.

I had to remove the glovebox to access the RCCM recently and the glovebox light wiring plug was still disconnected. Re connected it and it all works again!

 

Hmmm ... wonder what happens if the glovebox bulb burns out.

 

You've got problems. Trunk and RCCM are unconnected as are glove box lamp and trunk release. You've probably got a loose wire or bad connector or the like. Have a look at the elec guide from JTIS and you'll see.

 

I agree with jagv8, I have my glove box light disconnected as it doesn't switch off when closed and my boot opens with any button.

 

Reckon I'm the one with the loose wire for buying this car in the first place.

I'm not alone with this odd behaviour, there was another member either here or on the UK site that noticed the same with his boot after disconnecting the RCCM, which is why I checked mine.

I also noticed that the MIL ilght came on once the RCCM was disconnected and the car was driven, which went out once the RCCM was connected back up again.

I've tried with wiring diagrams before and end up lost and confused?

On top of this, I've spent the day wiring in 2 x fuses to the DCCV wiring and jumpering a wire on the RCCM board only to find the blowers are still not working correctly. Hot on passenger side and cool on the drivers side, which is the opposite to how it started. Really p1ssed off now.

 

You can read the code that caused the MIL, even if now off, unless you've disconnected the battery.

Well, tell the other member he has a wiring/connector fault, same as you had! And expect yours to come back

BTW, the jag elec diagrams are the best I've seen so far in any make

 

I've looked at the glovebox wiring and am wondering if this is a plausible theory. Assuming the basic wiring in all theses cars is the same for both markets and just that not all of it is used, depending on the market it's in.

In the US, there is a valet button in the glovebox. In the UK, it is not present. The valet button stops access to the boot via any buttons except the keyfob, which is why you'd give the valet parker the basic spare key, not the full function remote key, as per the owners manual.

On my car, the glovebox wiring comes out of the glovebox light as two wires on a brown connector. The wiring is then wrapped but at some point along it's 10" length, it becomes four wires which then then connects to a grey connector. This grey connector then goes off into the dash.

If I disconnect the grey, four wired connector, therefore isolating the glovebox, the boot will only open via the keyfob.
If I disconnect at the brown, two wired connector, the boot remains operational with all buttons as before.

I believe that the four wires are only used in the US, but not in the UK.

Does that make sense?

 

At what point is yours disconnected ? At the glovebox brown connector or the grey connector further up the chain?

 

I just removed the bulb, along with my fingerprints as it was damn hot

 

Aha - brilliant! I like the valet key theory. Looks to be that. When fitted it's just a switch so just shorts out a connection when NOT in use. That connection provides the enabling of the trunk button (and fuel flap etc). The UK spec is meant to be a permanent short i.e. permanent enabling of trunk switch etc. Disconnect it and it's like setting the valet feature.

It's shown in the elec guide fig 12.1 at top left

 

Pah, who needs an electrical diagram? I simply applied logic.

Actually I'll have a look.

 

And 11 years later having just replaced the DCCV and RCCM but not yet having refitted the glove box (final acceptance tests of my work still pending) I had exactly the same issue with my boot button. This thread has saved me a lot of time! Thanks All!