Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Airbag faults - where to find sensor?
Gents,
I have a persistent airbag light - red.
Reading codes, I get:
B0091-81 Left Side Restraints Sensor 1
B1A00-16 Control Module
B1A00-49 Control Module
B00D2-87 Restraint System Malfunction Indicator 1
U0073-88 Control Module Communication Bus Off
U0155-87 Lost Communication with Instrument Cluster Control Module
U0122-87 Lost Communication with Vehicle Dynamics Control Module
1. Where is the "Left Side Restraints Sensor 1"? in the door? the B pillar?
2. It reports open circuit - is there anyway to test the sensor itself to isolate the wiring?
3. B1A00-49 seems to indicate replacement of the RCM. But if the RCM had failed, how could it cause a fault on the Left Side restraint Sensor?
Many thanks in advance,ikonw8
2006 Landrover LR3 4.4L V8 HSE
22nd Feb 2024 8:28 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
Sounds seatbelt related to me.
C Heck out live values if you can.
22nd Feb 2024 10:41 pm
Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2321
B1A0049: Internal electronic fault in the restraint safety device control module, Replace the RCM. Consult the Warranty Policies and Procedures manual if a module is suspect.
B1A0016: Control module circuit voltage lower than threshold value:
Voltage lower than (main control module voltage – 2 V) for > 10 seconds
Low battery voltage
High resistance control module circuit
When the ignition is switched on, the RCM supplies voltage to the crash sensors which carry out a self-check. After passing the required self-checks, the crash sensors continuously send "sensors active" messages to the RCM. If a fault is found, the affected crash sensor transmits a fault message (instead of the "sensor active" message) to the RCM. The RCM then stores the relevant fault code and turns on the SRS warning light.
The Left Side Restraints Sensor seems to be inside front left door.- Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
22nd Feb 2024 10:45 pm
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Thank you...
How does one determine if a sensor is faulty? Can it be measured with a multimeter?ikonw8
2006 Landrover LR3 4.4L V8 HSE
23rd Feb 2024 2:39 am
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Pete K wrote:
Sounds seatbelt related to me.
C Heck out live values if you can.
The live values look good - I get around 2 ohms on all the airbags, the seat belt and door switches are all reading correctly. Makes me think the RCM is working.ikonw8
2006 Landrover LR3 4.4L V8 HSE
23rd Feb 2024 2:52 am
Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2321
All 6 impact sensors are the same... it would be nice to switch the one in the left door with another and recheck if the DTC changes...
In any cases I would check the RCM feed voltage first according to the main fault code.- Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
23rd Feb 2024 6:53 am
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Sidestick that is a great idea, I didn't realize they were all the same. Thanks.
Good idea on the voltage going into the RCM.ikonw8
2006 Landrover LR3 4.4L V8 HSE
23rd Feb 2024 1:13 pm
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Update:
I removed the door card, and found the crash sensor. I unplugged it and re-ran the diagnostic. I got the same error but it was reported permanent instead of intermittent.
I unplugged crash sensor 2 on the B pillar and that fault came up as permanent.
I then put sensor 2 into the door (sensor 1) and re-ran the test. I still had an error code, intermittant.
However, I don't seem to be able to clear the codes, so I don't know if I am looking at old data or new.
Using a LAUNCH Creader Elite.
ikonw8ikonw8
2006 Landrover LR3 4.4L V8 HSE
24th Feb 2024 5:00 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14129
Hi
As Pete says with regards to the restraint pre tensioner , alas been here done that
Plse have a look on the ends of the seat belt pre tensioners , if they’ve fired ur see the rubber cover squashed and there will be wire sticking out the end , if u need a new / secondhand one they will be sided
If they haven’t fired it might just be the wire underneath the seat where it plugs into the connector block ?
When I had to replace some of mine I also had to reset the ECM crash data , hopefully it’s just the seat belt pre tensioners at fault and resets itself , if not the ECM crash data can be reset by companies , but again hopefully urs will reset itself if the tensioner is at fault and no other error codes found
If u don’t mind me adding , plse don’t use a multimeter on any airbags / live circuit as I’ve heard it can sometimes cause them to fire , plus as a side of caution best to disconnect the battery and wait for 15-20 mins before connecting / disconnecting any airbag system
Plus 1 ref what sidekick has mentioned , interior crash sensors are red, exterior ones are black
Plse also ensure ur battery is fully charged , should be around a min of 12.6 Vdc with the engine off
Hope that also helps u , also included some pics showing what they look like if they’ve fired
Click image to enlarge
Click image to enlarge
Click image to enlarge
25th Feb 2024 7:10 am
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Thanks GStuart,
I will take a look at the seat belt pre-tensioners. I don't think they have been fired. I am the owner since 2014 and have never been in a crash. There was no crash history noted when I purchased the card either. Maybe the wiring?
I hope I don't have to reset the crash data, but I am not sure I even have any crash data - how can you tell?
Good tips on the airbags! Thank you. I haven't had to measure them at all, the Elite tool is reporting that the airbags are all good (around 2Ohms resistance), so I am leaving them alone.
Confirmed - both the interior sensors I have seen are red - FoMoCo made in Germany.
I will double check the battery too... Thanks!
I'll update on my progress! Thanks for your help!ikonw8
2006 Landrover LR3 4.4L V8 HSE
25th Feb 2024 1:12 pm
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
After having spoken to a couple people including the GAP IID people, it looks like I need a new air bag (RCM) module... I can't clear any airbag codes, only collect new ones...
Hopefully that will allow me to clear the codes.ikonw8
2006 Landrover LR3 4.4L V8 HSE
6th Mar 2024 4:25 pm
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
All,
I replaced the Airbag module with a used unit from eBay. Good news - I was able to clear the codes; the old module was indeed defective. None of codes from the defective unit came back after I installed the new unit.
However, now I am getting a B1211-1B Driver Seatbelt Retractor Pretensioner Deployment Control - Open Circuit error. I can't clear it. The driver side pretensioner has not been fired (in my LR3).
Could this be a code from the car the new unit came out of?ikonw8
2006 Landrover LR3 4.4L V8 HSE
23rd Mar 2024 10:38 pm
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
Final update:
After all - it was, in fact the airbag module. I replaced the airbag module (or RCM as it is known) with a good used unit. However, the error codes I was getting on the used unit were "phantom" codes. The replacement module was for an LR4. I used the GAP IID tool and the helpful folks from GAP to reprogram the module to my particular spec LR3.
Once that was done all the airbag related codes went away.
Now, on to the parking brake ikonw8
2006 Landrover LR3 4.4L V8 HSE
Last edited by ikonw8 on 27th Mar 2024 9:55 am. Edited 1 time in total
27th Mar 2024 1:27 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14129
Hi
Great news and many thks for updating us
Hope the epb will be a straight forward repair
27th Mar 2024 9:18 am
ikonw8
Member Since: 13 Jul 2014
Location: Toronto
Posts: 111
It was straight forward! Posted the results in another thread.ikonw8
2006 Landrover LR3 4.4L V8 HSE
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
