Advertise on fullfatrr.com »

Home > In Car Electronics (L405) > SOS limited functionality - battery replaced but not fixed
Post Reply  Down to end
Page 1 of 2 12>
Print this entire topic · 
lambo911



Member Since: 13 Jan 2022
Location: St Albans
Posts: 85

United Kingdom 2016 Range Rover Autobiography SDV8 Barolo Black
SOS limited functionality - battery replaced but not fixed

Hi All,

I have jut replaced the battery in my telematics control unit with a genuine LR one but I still have the error on the dash. I can clear it with my code reader but it comes back again straight away. It isn't an easy job to change as you need to remove half the dash to get the panel below the steering wheel out.

As it is a chargeable battery I figured I might need to run the car but after about 2 hours of running the error is still showing.

is there a reset process to tell the system a new battery has been fitted ? On one of the Jag websites it talks about pressing and holding the SOS button to do reset but I can't find anything on LR forums.

I measured the voltage of the old 4v battery and it was 3.85 which doesn't seem bad and I am surprised the systems thinks that is too low.

I am wondering if the issue could be related to something that happened when I was charging the main battery overnight. At 4am I received a call from the LR tracker company to say they had detected a voltage change on the car and that someone might be trying to steal it. No one was trying to steal it of course but it was good to know there are people out there monitoring my car.

The next day was when the SOS error appeared. It couldn't be related to me charging the battery could it ? 2016 AB SDV8 Barolo black
2019 AB SDV8 Santorini black

Post #685167 9th Feb 2024 9:53am
View user's profile Send private message View poster's gallery Reply with quote
Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1362

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

Did you follow the instructions in the WM?

Prior to any work being undertaken on the telematics control module, confirmation is required if there is a stolen vehicle tracking subscription on the telematics control module. If there is stolen vehicle tracking subscription, the telematics control module will need to be placed into Service Mode by the customer in the InControl Smartphone app or on the InControl website. Failure to follow this instruction could result in theft notification alerts being activated

Could be the module is stuck in Service Mode, (or stuck in Alert mode) if it’s unaware it has had a new battery? Just postulating, I’m no expert! Whistle “If it ain’t broke, don’t fix it” -where’s the fun in that?

Post #685172 9th Feb 2024 10:28am
View user's profile Send private message View poster's gallery Reply with quote
lambo911



Member Since: 13 Jan 2022
Location: St Albans
Posts: 85

United Kingdom 2016 Range Rover Autobiography SDV8 Barolo Black

Hi, yes I did put it into service mode which is now turned off. 2016 AB SDV8 Barolo black
2019 AB SDV8 Santorini black

Post #685179 9th Feb 2024 12:01pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 04 Jul 2016
Location: Lanarkshire
Posts: 217

Scotland 2018 Range Rover Vogue SE SDV8 Carpathian Grey

From the workshop manual (in the wiki):

Quote:
When the back-up battery has been replaced, the system must be re-set using a specific application on a Land Rover approved diagnostic system, setting the battery level back to 100%.

Not sure which third party diagnostic tools can do this.

It's possible that with the change in voltage during charging that the unit detected then triggered it into using the back-up (non-rechargable) battery and depleting it.

Check the telematics fuse, should be fuse 41 (5A) in the passenger fuse box (supplies the telematics unit)

Just for clarity, what is the fault code you are reading?

Post #685186 9th Feb 2024 1:39pm
View user's profile Send private message View poster's gallery Reply with quote
lambo911



Member Since: 13 Jan 2022
Location: St Albans
Posts: 85

United Kingdom 2016 Range Rover Autobiography SDV8 Barolo Black

Hi, it is U2109-09

Fuse is ok 2016 AB SDV8 Barolo black
2019 AB SDV8 Santorini black

Post #685197 9th Feb 2024 3:27pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 04 Jul 2016
Location: Lanarkshire
Posts: 217

Scotland 2018 Range Rover Vogue SE SDV8 Carpathian Grey

Click image to enlarge


Seems like the telematics unit needs told it has a new battery.

Post #685199 9th Feb 2024 3:45pm
View user's profile Send private message View poster's gallery Reply with quote
lambo911



Member Since: 13 Jan 2022
Location: St Albans
Posts: 85

United Kingdom 2016 Range Rover Autobiography SDV8 Barolo Black

Thank you.

Looks like I'll need the dealer to do the reset for me. 2016 AB SDV8 Barolo black
2019 AB SDV8 Santorini black

Post #685200 9th Feb 2024 4:03pm
View user's profile Send private message View poster's gallery Reply with quote
Captain_67



Member Since: 26 Feb 2024
Location: Ellesmere
Posts: 14

United Kingdom 2015 Range Rover Vogue SE SDV8 Corris Grey

I have purchase a battery for the telemetry unit.

The steps as I understand them are
1 Car in service mode via app or website
2 Disconnect Battery Negative termininal
3 Remove kick panel above drivers feet (could anyone advise me how i do this without breaking anything)
4 Remove Telemetry unit
5 replace 4.0v battery DPLA-70720-AA
6 Refit
7 Clear fault code for low battery in telemetry ECU
8 Car out of service mode
Hopefully when I drive the car for an hour the SOS limited functionallity message will goIs there anything else i should do.

Thanks

Thanks,

Post #686804 29th Feb 2024 5:33pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 04 Jul 2016
Location: Lanarkshire
Posts: 217

Scotland 2018 Range Rover Vogue SE SDV8 Carpathian Grey

Don't forget to reconnect the main battery after step 6

Quote:
7 Clear fault code for low battery in telemetry ECU

Will not on its own reset the limited functionality message, you need to run the "TCU back-up battery test" so the TCU recognises the battery has been replaced.

Post #686807 29th Feb 2024 5:50pm
View user's profile Send private message View poster's gallery Reply with quote
Captain_67



Member Since: 26 Feb 2024
Location: Ellesmere
Posts: 14

United Kingdom 2015 Range Rover Vogue SE SDV8 Corris Grey

Thanks Fifth

Any tips for removing the plastic trim above the pedals, is it screwed or clipped into place?

The TCU battery test is that an MD diagnostic test or is it a function of an after market diagnostic tool for example IID Tool?

Thanks

Post #686820 29th Feb 2024 7:49pm
View user's profile Send private message View poster's gallery Reply with quote
Fifth Horseman



Member Since: 04 Jul 2016
Location: Lanarkshire
Posts: 217

Scotland 2018 Range Rover Vogue SE SDV8 Carpathian Grey

Can't comment on removing the trim, my experience with the TCU is on the 17/18MY vehicles which have it in a different place.

IID tool should be able to do it, needs the latest software.

Post #686824 29th Feb 2024 8:04pm
View user's profile Send private message View poster's gallery Reply with quote
4RRS



Member Since: 13 Apr 2022
Location: Crudgington
Posts: 162

United Kingdom 2016 Range Rover SVAutobiography SDV8 Corris Grey

Captain_67 wrote:
Thanks Fifth

Any tips for removing the plastic trim above the pedals, is it screwed or clipped into place?

The TCU battery test is that an MD diagnostic test or is it a function of an after market diagnostic tool for example IID Tool?

Thanks


You need to remove the centre console right hand side trim as the pedal box trim clips into it and then it's a simple few bolts. I think it's made overly difficult to reach!

I did the same on my L494 and pretty sure it's a similar setup. L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.

Post #686828 29th Feb 2024 8:26pm
View user's profile Send private message View poster's gallery Reply with quote
Captain_67



Member Since: 26 Feb 2024
Location: Ellesmere
Posts: 14

United Kingdom 2015 Range Rover Vogue SE SDV8 Corris Grey

Thanks

I saw that Lambo 911who has a 2016 AB said it was a difficult job as he had to strip down half the dashboard so hopefully on a MY 15 it’s in the same place. Nothing worse than stripping half the dashboard out only to find out the TCU is located in the rear C pillar. I guess they must have moved it to wherever yours is at MY 16.5 or MY 17

Post #686830 29th Feb 2024 8:33pm
View user's profile Send private message View poster's gallery Reply with quote
4RRS



Member Since: 13 Apr 2022
Location: Crudgington
Posts: 162

United Kingdom 2016 Range Rover SVAutobiography SDV8 Corris Grey

4RRS wrote:
Captain_67 wrote:
Thanks Fifth

Any tips for removing the plastic trim above the pedals, is it screwed or clipped into place?

The TCU battery test is that an MD diagnostic test or is it a function of an after market diagnostic tool for example IID Tool?

Thanks


You need to remove the centre console right hand side trim as the pedal box trim clips into it and then it's a simple few bolts. I think it's made overly difficult to reach!

I did the same on my L494 and pretty sure it's a similar setup.


Here you go, just pulled this from topix: -

https://www.fullfatrr.com/gallery/albums/u...833340.pdf L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.

Post #686832 29th Feb 2024 8:54pm
View user's profile Send private message View poster's gallery Reply with quote
Captain_67



Member Since: 26 Feb 2024
Location: Ellesmere
Posts: 14

United Kingdom 2015 Range Rover Vogue SE SDV8 Corris Grey

Perfect, thanks for the information

Post #686833 29th Feb 2024 9:13pm
View user's profile Send private message View poster's gallery Reply with quote
Post Reply  Back to top
Page 1 of 2 12>
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
fullfatrr.com RSS Feed - All Forums


Switch to Mobile site