Air compressor running after engine is off

Defender or wife · 2025-07-10T23:02:06+0100

Evening all, after picking your brains again...

A couple of weeks ago my air compressor on my D2 for the rear bags kept running after the engine was off, this resulted in a knackered compressor. Today I have fitted a new one with new relay and fuse as this had also blown.

It ran fine for a while but then started to keep running after the engine was switched off again. The air bags are not dropping in height at all after I pulled the fuse to stop the compressor so that rules out a leak.
The fuse is starting to look a little worse for wear again so this might blow soon when I put it back in, keep in mind it's only a few hours old ...

Any suggestions as to what the cause or fix is?

Could the ride height sensors be playing havoc?

Any help appreciated

sierrafery · 2025-07-11T05:34:08+0100

Defender or wife said:
The fuse is starting to look a little worse

Hi, which fuse exactly?

Defender or wife said:
Could the ride height sensors be playing havoc?

No, at this point the first suspect is the fusebox or in the worst case the SLABS ECU unless it's a wiring issue somewhere and that coud be a nightmare.

Defender or wife · 2025-07-11T07:14:00+0100

sierrafery said:
Hi, which fuse exactly?

No, at this point the first suspect is the fusebox or in the worst case the SLABS ECU unless it's a wiring issue somewhere and that coud be a nightmare.

FL9 the fusible link is the one that had blown. I changed the relay and compressor yesterday, then the FL9 started to look rough again before I took it out to stop the compressor from running.

I have had a look quickly under the fuse box and everything seems ok underneath.

Defender or wife · 2025-07-11T08:27:21+0100

sierrafery said:
Hi, which fuse exactly?

No, at this point the first suspect is the fusebox or in the worst case the SLABS ECU unless it's a wiring issue somewhere and that coud be a nightmare.

Can you do a straight swap for the SLABS ECU, plug and play as long as it's from a disco with air bags?

sierrafery · 2025-07-11T09:57:12+0100

Defender or wife said:
Can you do a straight swap for the SLABS ECU, plug and play as long as it's from a disco with air bags?

Yes, you can for test just the ride heights might be a bit different but if you connect it and the compressor will not run like with the original you know that's it. If nothing changes you should swap the fusebox... what ever you swap disconnect tne battery's negative lead first and reconnect it only after everything is plugged back

Defender or wife · 2025-07-11T11:40:03+0100

sierrafery said:
Yes, you can for test just the ride heights might be a bit different but if you connect it and the compressor will not run like with the original you know that's it. If nothing changes you should swap the fusebox... what ever you swap disconnect tne battery's negative lead first and reconnect it only after everything is plugged back

Come to it this morning and in traditional landrover style it's working fine

hughdavies · 2025-07-11T11:49:22+0100

I would still check out the fusebox for corosion, a known problem. Hot weather may have dried out dampness, and it will go again in the wet.

Defender or wife · 2025-07-11T13:31:52+0100

hughdavies said:
I would still check out the fusebox for corosion, a known problem. Hot weather may have dried out dampness, and it will go again in the wet.

This has only been a issue for the past 2 weeks and we have had no rain for alot longer than that

Air compressor running after engine is off

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