Hey all,

My name is Jeremy, I’m a first time poster, long time forum reader.

I got myself in deep with my 2005 LR3 SE (4.4V8). It all started over a year ago when I accidentally broke the C0635 ECM electrical connector trying to remove it like an idiot. So I bought a new connector and re-pinned it. The truck ran good for a while and then I started having some other weird issues. It’s been so long that I’m not exactly sure what started it to be honest.

Long story short, I have a ton of MILs and faults, I thought it was the instrument cluster connections as so many others have had issues with that and all the modules had lost communication to the IPC. Soldered the connector connections just fine and then tried to re-flow the main IPC chip and totally messed up a selection of the pins on the chip and the traces on the board. Oops, my mistake, I’m handy but apparently not that skilled when it comes to soldering, lesson learned.

I bought a used IPC and an GAPIID tool to re-program the new IPC and contacted GAP to get the required instructions etc for the IPC flash. The procedure failed and in talking to GAP they seemed to think I have a CAN bus issue or some other power/ground issue. I have spent hours checking continuity between HSCAN wires between modules and connectors, MSCAN wires as well.

Then Patrick at GAP noticed that I wasn’t getting ECU info from all of the modules in the truck. In looking around it seems that all the modules are getting power and such but I have noticed something odd with the BCM (CJB), I noticed that the BCM only has 0.4V at the BCM control module…

Sorry for the long post, I really need to get this thing fixed and back on the road as I’m in Cleveland and snow is coming.

Does anyone know off the top of their heads if the BCM is supposed to operate on less than 12V? All other modules seem to operate on 12V, which leads me to think there’s either an issue with the BCM(CJB) or there’s a power issue to the BCM.

Can somebody with a GAPIID tool with a good running LR3 check live data and see what the voltage supply is at the BCM control module for me? (lol, ya I know what I said…good running LR3 &#128514

Also if anyone else has ever dealt with something like this, does anyone know what the pin is for the supply voltage to the BCM? I have all the diagrams and such but I can’t seem to find what actually powers the BCM specifically. The BCM isn’t directly labeled on the wiring diagrams.

Thank you in advance to anyone who has any input for me!

-Jeremy

 

does the truck run? if you clear all the codes with the key on engine off and then start it what codes come back right away?

 

It would start with the original IPC before I completely messed it up trying to again fix my mistake. Now it will not start…but the 27+ faults and MILs would still be there even if it started. I haven’t been able to drive it in almost a year bc it won’t pass emissions in my county with the MILs.

My first issue I need to figure out is if I’m getting the proper voltage at the BCM.

Really hoping someone can confirm or deny that the supply voltage should be 12V at the BCM control module…

 

everybody that can help you on here is going to want to know what the codes are.. if you have the original cluster i would recommend sending it to clusterfix to see if they can fix it. that will get you past needing to program the "new" one .
also to pass emissions you just need the check engine light to not be on or pending on correct? im pretty sure nothing related to the BCM will set a check engine light code other than maybe a immobilizer learn or brake pedal switch maybe.

 

here is a list of the codes I was able to pull the last time the original IPC was still recognized when it was in the vehicle. Now it doesn’t recognize the VIN or the ignition status thanks to my ****up when trying to re-flow the main chip.

Airbag

• U0122-87 (AF) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:40 )

Engine Petrol

• U0102-00 (2A) Lost communication with transfer case control module

Parking Brake

• U0101-87 (FB) Lost communication with transmission control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:49 )
• U0122-87 (FB) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:49 )

Steering Angle

• U0122-87 (2F) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:51 )

Suspension

• C1A09-1C (AF) Pressure sensor signal - General electrical failure - circuit voltage out of range
  ( on 21-11-2024 12:17:51 )
• C1A03-1C (AF) Front left height sensor - General electrical failure - circuit voltage out of range
  ( on 21-11-2024 12:17:51 )
• U0122-87 (AF) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:50 )
• U0102-87 (2F) Lost communication with transfer case control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:52 )
• C1A00-54 (AF) Control module - System programming failure - missing calibration
  ( on 21-11-2024 12:17:49 )

Terrain Response

• U0122-87 (2F) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:49 )
• U0102-87 (2F) Lost communication with transfer case control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:49 )

Transmission

• U0102-87 (2F) Lost communication with transfer case control module - Bus signal/message failure - missing a message
  ( on 21-11-2024 12:17:50 )
• U0416-86 (2F) Invalid data received from vehicle dynamics control module - Bus signal/message failure - signal is invalid
  ( on 21-11-2024 12:17:52 )

Ventilation

• B1B78-84 (2F) System pressure - Bus signal/message failure - signal is below allowable range
  ( on 21-11-2024 12:17:50 )

I do not believe the cluster can be fixed as the traces on the board are shot. I just emailed cluster fix to see what they think though…



The person I spoke to at GAP Diag. told me I could do the cluster swap without the original cluster but I need to get power and communication to all the modules and that’s what I’m struggling with bc I can’t figure out if I’m not getting enough voltage to the BCM or not. It sure seems like it’s a pass through module for the whole CAN network. Also I can’t tell what the actual topography is of of how the networks all talk to each other. Like what is the order of communication…? The OEM wiring and CAN diagrams are kinda convoluted in that regard.

Thanks for your response.

 

Actually here is a more accurate list of the faults and codes I have now.