Hi there,

I have an anoying fault thats been with me for the last 6 month, I've finally got around to try and solve it.

There are two Dash Warning Messages and of course the Adaptive Cruise Control does not work.
With the GAP IID3 - I have the following mesage in the Fault Log.

Does anybody have experiance of solving this fault and also know where the SPeed Control Module is located ?

IPC-Instrument Pack
U0104-00 (2F) Lost communication with speed control module
( on 31-10-2020 14:06:26 at 137480 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear

PCM-Engine TDV8 4.4L
U0104-00 (2F) Lost communication with speed control module
( on 31-10-2020 14:06:28 at 137481 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear




 -------------------------------------
MY 2012 4.4 TDV8

The module is behind the front bumper just inwards from the right headlight. You might want to check the fuse in the engine bay fuse box (fuse 17, 10A).

Many thanks,
To get to the unit, does the bumper or anything need removing ?
Thx -------------------------------------
MY 2012 4.4 TDV8

Yes, the bumper has to be removed.

...or maybe through the wheel arch ? Mike - MPx

2017 5.0 V8 Supercharged SVAutobigraphy Dynamic SVO Palette Grey (2021-...)
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2007 4.2 V8 Supercharged Vogue SE Tonga Green (2012-2017)
2002 4.4 V8 Vogue Bonnatti Grey (2008-2012)

Can anybody point me at the method or manual for this ?

I can't find any reference to the 'Speed Control Module' within the Workshop Service Manual. Perhaps its under a different name ? -------------------------------------
MY 2012 4.4 TDV8

Perhaps described as the adaptive speed control module. Attached is the wiring schematic.

https://www.fullfatrr.com/gallery/albums/u...trol~0.pdf

Many thanks, -------------------------------------
MY 2012 4.4 TDV8

Does anybody have either of the following documents for the L322 2010 onwards RHD ?
- Connector Quick Reference Guide
- Range Rover Electrical Library


I’m trying to track the locations of connectors C3618 / C3619 and C2145

Many thanks, -------------------------------------
MY 2012 4.4 TDV8

https://www.fullfatrr.com/gallery/albums/u...dar%29.pdf

Many thanks GraemeS.

I’m still trying to track down the problem with MY2012
GAP IID Fault Report.
- U0104-00 (2F) Lost communication with speed control module

I was not sure where those cables route from and to, under the Front Bumper ?

Do you have any other information, pictures, wiring Dia etc you can point me to ? -------------------------------------
MY 2012 4.4 TDV8

I don't have any pictures but the wiring diagram is attached. Mine wasn't originally fitted with ACC and there was a dummy plug in the harness socket clipped to the panel behind the bumper (nothing to do with the bumper) where the radar unit mounts and into which the radar unit's link harness fits.

If the 10A fuse #17 in the engine fuse panel is intact and the 5A fuse #6 in the passenger fuse panel is intact then the bumper will need to be removed to check the connectors and wiring. The radar unit itself could be faulty.

IIRC my biggest issue with R&R'ing the bumper was dealing with the screws at the lower edge of the wheel-arch just behind the liner, that is once I found the screws near the fog-lights.

https://www.fullfatrr.com/gallery/albums/u...trol~1.pdf

Just checked the Fuses again #17 and #6 and they are good. So I was just wondering if there is anyway to get to the AAC Control Unit without removing the bumper ? Perhaps from behind the wheel watch liner ?

By the way - I have also pasted below my IID Faults invade there may be a correlation between other Fault Messages. ?

Does anybody have any other thoughts on those Fault Messages ?

VIN: HIDDEN
L322 - Range Rover 2012
Vehicle scanned on 21-04-2024 12:18
Using IIDTool BT V3.0 B2643

BCM-Body Control

B1D17-87 (2F) Bus circuit - Bus signal/message failure - missing a message
( on 21-04-2024 12:17:41 at 175670 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
B10AD-87 (2F) Rain sensor - Bus signal/message failure - missing a message
( on 21-04-2024 12:17:41 at 175670 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
IPC-Instrument Pack

U0104-00 (2F) Lost communication with speed control module
( on 21-04-2024 12:17:45 at 175670 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
IPMB-Camera

B12C1-49 (2F) Right mirror camera - System internal failure - internal electronic failure
( on 21-04-2024 12:17:46 at 175670 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
PCM-Engine TDV8 4.4L

P040D-00 (2F) Exhaust gas recirculation temperature sensor A - circuit high
( on 21-04-2024 12:17:48 at 175671 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
U0104-00 (2F) Lost communication with speed control module
( on 21-04-2024 12:17:46 at 175671 km )
- Test Failed
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
RCM-Airbag

B1127-13 (AA) Passenger's side - side air bag deployment control - General electrical failure - circuit open
( on 21-04-2024 12:17:51 at 175670 km )
- Test Failed This Monitoring Cycle
- Confirmed
- Test Failed Since Last Clear
- MIL Requested -------------------------------------
MY 2012 4.4 TDV8

The radar unit's bracket is bolted to the front of part# LR020912 in line with its RH bracket. Some access might be possible from underneath the bumper if the front undertrays are removed, possibly if just the small RH triangular cover is removed.