I recently got a 2010 LR4 (US) and the auto wipers don't really work. The auto headlamps do as much as I'd expect something from 2010 to work, but not the wipers.

Intermittent does not function at all. High, Low, Rear, Squirters, all that works great. When it's in the Auto position, no wiping happens on its own, even with big ol drops under a tree while it's raining steadily. If I unplug the rain sensor, intermittent works fine (as does the min/max speed collar). If I plug the sensor back, any time I wiggle the molex connector, wiping happens. If I tap on the rain sensor housing lightly, wiping happens. It takes quite a tapping on the windshield basically right at the spot of the sensor to get it to trigger at all otherwise. I tried to do a hard reset (unplug battery, wait a bit, discharge the rest of the latent charge by bridging the disconnected cable ends through a small load, in this case a DMM in current measuring mode). Nothing seems to help.

I've only had one other vehicle that had auto wipers I used at all (2008 335i) and didn't really like them, so I ended up mostly manually controlling them... so I'm fine with not having Auto work, but it'd be nice if my intermittent functionality wasn't also hijacked. Do I lose Auto lights as well with this unplugged? I wasn't sure if the sensor was shared for those.

If I had to guess, I'd think maybe I have a bad sensor? Seems easy enough to get to, but as far as installing it correctly, is it a pain? I wish I would have done this before I got my windshield replaced last week, would have just had him put the new one in. Is there another possible culprit I'm not thinking of? All the other parts of the system (outside of wiring/harness shenanigans) seem like they'd have different/more general symptoms.

Thank you in advance.

EDIT: So I did a little more digging and the GAP IID tool did catch some faults that look interesting... I do have a compressor that needs a dryer, so I've got the typical C1A20-64, but also these:

ABS-Brake Module

• U0421-68 (28) Invalid data received from ride level control module - Algorithm based failure - event information
  ( on 14-09-2022 16:33:08 at 206476 km )

ACM-Audio System

• U2100-00 (68) Initial configuration is not complete
  ( on 25-10-2022 11:24:16 at 207524 km )
• U0159-00 (2A) Lost communication with parking assist control module
  ( on 25-10-2022 11:52:57 at 207524 km )

BCM-Body Control

• B10AD-87 (2C) Rain sensor - Bus signal/message failure - missing a message
  ( on 25-10-2022 11:24:40 at 207524 km )

IPC-Instrument Pack

• B1A85-96 (2C) Ambient light sensor circuit - Component failure - internal failure
  ( on 19-09-2022 19:19:51 at 206576 km )

KVM-Keyless

• B10A9-00 (2A) Remote keyless entry - Less than 2 keys programmed
  ( on 14-09-2022 12:55:54 at 206476 km )

RLM-Suspension

• C1A20-64 (2E) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
  ( on 16-09-2022 11:09:00 at 206512 km )

What does it even mean if it's "missing a message"? I would imagine if there were general bus health issues, there'd be a lot more wrong, no? Or does it have an isolated bus? Some of these error messages are weird.

 

Hi, did you get to the bottom of the B10AD-87 (2F) Rain sensor issue? I have the same fault and my Auto Lights are permanently on

 

See my post:
https://landroverforums.com/forum/lr...08/#post894392

Cheers

 

Thanks Winching. However, your thread/post is fairly generic and this is very specific to the Rain Sensor issue in this initial post. I was hoping for something more specific to how the OP resolved the Rain Sensor fault.

 

As per the workshop manual, do confirm the state of the battery first. Most ignore this very necessary step.
All that post implies is a response of “its good” is irrelevant.
In your particular case you have the tell tale signs of CAN bus comms issues. I see your engine is running. This is no way to test the battery.
Once the battery is ruled out, then have the module tested.

 

Thanks again Winching. How do I get access to the Workshop Manual, I note you mention this in the other thread and would be good if it was sticky and or, easily available

 

Battery is good for me. Will be replacing the sensor this weekend to see if that makes any difference. My heated windshield doesn't work either, so my suspicion is the sensor replacement won't be the solution. Hopefully it's not a harness issue buried somewhere or some other module pooping on the bus but I guess we'll see.

 

I checked the splice’s in the drivers and passenger sides down under the silver step trim. I was advised the splice’s have a habit of corroding or coming apart. Maybe an option for you to check.


I did mine without removing the seats

 

Looks like it was the sensor after all; specifically the windshield guys DID replace the clear layer between the sensor and windshield, BUT the mounting tape they used was too thin. I probably would have figured that out if I had been aware of how doggone tight those clamps are supposed to feel when securing the sensor to the bracket, but oh well. Now I have a spare sensor I guess; just needs the proper thickness silicone/tape replacement. It does react properly outside of the windshield environment but that air gap was obviously an issue.

Now on to why the heated element doesn't work... I'd be floored if it isn't something those same guys forgot/botched. So far we've got the a pillar trim which was all busted (nothing like it flapping against your pillar when going 80 down the freeway out of nowhere; thankfully it still had one clip faithfully holding on for dear life) and the rain sensor... I hate to be the guy that says "before you leave, let me make sure everything still works", but I guess I've learned my lesson again.

As far as why the bus message was missing, that error hasn't popped up recently but I'll definitely be keeping my eye out for it. I don't feel like the sensor replacement explains that except maybe I hadn't cleared faults since the last time I had been fussing with connecting/disconnecting it? I'd be pretty embarrassed if that was the case, but I could swear I made sure I did that. Maybe not though. Also possible the sensor was the culprit but it does seem alright from the testing I've done on it. Who knows.

Now on to everything else that's busted.

 

The heated windscreen is connected behind the inner A-pillar. Black connector with a thick black and purple wire if I remember correctly. Check if those are connected on each side