Thread: SLS problem doing my head in

Originally Posted by xaymaca

Also, just confirming sierra, the plugs are near the inside fuse box? Not the engine bay one?
At work, I don't have rave to check 😟

near the engine bay fusebox

Originally Posted by xaymaca

Yes, very good point. This is possibly in line with when I did the lift.

Hmmm, just looking at the rave location for those two connectors...

Right above the shock tower, so maybe i stressed them or knocked them while putting the new shock in?

Keen to check it out tomorrow!

So 100% an electrical issue. The car stayed at the designated ride height for 2 days while I didn't touch it. I disconnected the battery, and unplugged both connectors at the fuse box, sprayed with contact cleaner and ensured they were definitely clean and undamaged.

Went and unlocked the car just then, opened the driver's door and *ppshhhhhh* the back end sinks to the bumps! GRRRRRR!

I stupidly locked the car to go and sulk, then realised I should have got readings of the sensors. So unlocked and ignition to on, both sensors reading perfect voltage and height. WTF!

Any more ideas, or any places I can measure voltages or resistances? Only problem is getting into those pesky plugs, the sockets are tiny!

I've been reading this thread and just realised I went through a very similar thing about 2 months ago. My cousin just put new air bags in his 99 Disco and it was doing something very similar. I used my Nanocom to try and get his height level and it would keep going down. I couldn't figure it out. I had used it on his car previously and it had worked. Plus I had done it on mine when I put my lift in. And it all worked fine.

Anyway, his were sitting on the bump stops. He was on his way to Rosebud and I told him to pop in at the Land rover place in Mornington. To see if they could figure it out. And what do you know! They hooked it up to there machine and set it up for him. No problems at all. He explained to them what he had been through. And they told him that some times the Nanocom can corrupt the computer. Or something along those lines.

And now he has had no problems at all with it. And a big shout out to those guys down in Mornington. They didn't even charge him for it. Top service!
Hope this helps. Maybe try one of the Land rover specialists. Shouldn't take them more then 5 min to do.

Cheers

Chris

Originally Posted by xaymaca

So 100% an electrical issue. The car stayed at the designated ride height for 2 days while I didn't touch it. I disconnected the battery, and unplugged both connectors at the fuse box, sprayed with contact cleaner and ensured they were definitely clean and undamaged.

Went and unlocked the car just then, opened the driver's door and *ppshhhhhh* the back end sinks to the bumps! GRRRRRR!

I stupidly locked the car to go and sulk, then realised I should have got readings of the sensors. So unlocked and ignition to on, both sensors reading perfect voltage and height. WTF!

Any more ideas, or any places I can measure voltages or resistances? Only problem is getting into those pesky plugs, the sockets are tiny!

When you open any door the SLS becomes active and the system tends to even up the level(even if the book sais it doesnt without ignition in real life it happens) but so it does when you turn ignition off when it might lower the end a bit after you left the vehicle...to release air it must open the two air supply valves and the exhaust valve so if when the system becomes active on door open signal it opens the two air supply valves which would not affect anything as long as the exhaust valve is closed ...what i presumed is that the exhaust valve got stuck open when you left the car but as the air supply valves were closed it didnt drop then when you opened a door the air supply valves opened too and the air goes out through the stuck open exhaust valve

the exhaust valve is connected to the compressor and maybe it closes when the compresssor starts pumping then the system is behaveing normally untill it's left over night again .... i hope i could make myself understood in my rotten english but that's the theory why i said to make the test with the unplugged exhaust valve

Does the car go back to ride height once you start to move, if it does I wouldn't worry about it, as long as it stays up while driving you shouldn't have an issue

Thanks Chris and sierra again for the replies!

Both of those theories are something that I have considered but maybe it's time to put them into action...

My thought is that somehow overnight it's losing connection (cold weather, bad connection) and doing exactly as you mentioned sierra, trying to level when the door wakes up slabs. Would explain the 000 reading even though intermittent.

Chris, I've also lost a bit of faith in the nanocom if it can't even read an sls code! I'll probably take it to a dealer or the local land rover repairer and see what they can offer for insight.

I am no expert in SLS,, but after two cars and 8 years with it,, one thing I know is that SLS wont work with the car door open. up, down, or sideways.