Disco 2 3 amigos with horn

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Vagabondrobb

Vagabondrobb

Active Member
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154
Location
Galloway Forest
So… MOT due so time to sort the most recent visit from the three amigos.

When they first appeared I believed it was simply a case of replacing hub as the bearings soon after gave in, but quality replacement (with sensor) didn't solve the issue. Cleaned ground points in front of air filter housing, which looked pretty good, and then cleaned the sensor plug socket with contact cleaner. Then cleared fault in nanocom, drove off and… nothing!

Then next morning as I'm driving through my local village I spot my mate coming out of the shop with his bacon butty, so I give him a little toot on the horn, and bing bing bing… just like that the bastards are back!

Got home, cleared faults, drove off down a track, got the TC going a little… all good… then I toot the horn and - bing bing bing, they return. Every time I use the horn, 3 amigos appear!

It’s not exclusive to the horn as they have come on without it too - but use the horn and it’s without fail!

Nanocom faults say FL sensor output intermittent and occasionally FL sensor electrical failure

I know diagnosing 3 amigos is notoriously hard, but does the horn offer any intriguing clue in this case?

Cheers!
 
Have you checked the connection points on the horn (from the wheel to the horn!(
Must admit! First time reading about 3 amigos and the horn??

As for the 3 amigos! Shuttle valve??

Had to bypass mine to get rid! That's after doing the bits you mentioned above!

Kev
 
Aye shuttle valve is what I will do when exhausted all other options, which will probably be soon!! I guess it does seem like it’s related to a ground fault somewhere.

Just hoping the horn thing can narrow it down!
 
Strange one... some troubleshooting is needed... first remove the horn relay and see if it happens that way too or not, if not put it back and unplug horns one at a time and see in each situation and report the result then maybe i can help
 
Well… as of this afternoon the horn is no longer reliably triggering the amigos, but some very weird stuff happening.

I just cleared codes and went to take for a spin to test the horn, and the TC was kicking in whenever I eased up the clutch to get moving. Horn now failing to trigger a response (everything still plugged in). Drove up the road and turned around on a gravel area, seemingly TC then causing amigos to kick in. So I stop, reset codes and then drive the 45 seconds back home. Park up on idle and notice the speedometer needle is moving around, going up to the 50mph mark and all over the place!! Settled down to normal when I started moving… but wtf!!?
 
sierrafery said:
what were the codes stored after this behaviour?
Click to expand...
There were none - it happened after clearing the FL sensor intermittent code that accompanies the 3 amigos… no new codes logged.

Only thing I did between the previous odd behaviour and the new was disconnect sensor plug and re clean, so maybe it’s something to do with the plug connector. I’m thinking of removing the plug and splicing the wires… see if it changes anything!
 
sierrafery said:
what were the codes stored after this behaviour?
Click to expand...

So I checked for continuity between the sensor plug and BCU (C0505 and C0516) and all seems ok there, so maybe splicing wire not solution.

After fiddling with stuff once more decided to drive up road and see if any change in behaviour. All ok until I dropped into a rut back down drive way and bing bing bing.

So ignition off and back on, nanocom in, go to read and clear codes but nothing shows. So I start engine and immediately the weird speedometer thing starts happening again, accompanied by a sort of buzzing motor noise (like the noise the motor for adjusting wing mirror makes), coming from the FL of vehicle somewhere.

So in nanocom I scroll through the ABS inputs - voltages seem fine, but wheel speed for FL sensor is showing random speeds, which obviously corresponds to the speedometer jumping about.

I would be inclined to say bad sensor, but I had the 3 amigos before previous hub and sensor replaced…
 
sierrafery said:
swap the front sensors around see what happens cos the ECU is quite suspect at this point, if the symptom goes to the other side then the sensor is fubar if not the ECU


just for accuracy: SLABS ECU not BCU
Click to expand...

SLABS ECU indeed!

Without looking myself - Is there a way to swap the sensors without removing hubs? Definitely don’t fancy taking two of those off. One is trouble enough! Haha
 
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