Immobilizer/anti theft

Bob Owner/Technician Fredericksburg, Virginia Posted   Latest  
Resolved
Electrical
Security
2009 Land Rover Range Rover Sport HSE 4.4L (5) 6-spd (6HP26) — SALSF25479A214868
Security Theft / No Start

Vehicle was towed in after customer stated car would not start. He mentioned that it did start 1 time after wiggling harness at BCM. Customer also stated that instrument cluster had been sent out to be repaired after taking it to the dealer and them stating that the cluster was his problem. After the cluster was repaired the vehicle ran for a couple of weeks before it started the same issue again.

The issue is that the car is a no crank, no start vehicle. When the key is turned to position 2 the locks will lock and then unlock, the hazards flash all the time, multiple lights on the dash. The red light on the cluster flashes all the time indicating that the alarm is active but in a passive state. 

Original scan had multiple faults for loss of communication with Vehicle Dynamics, Instrument cluster, Transmission. I can talk to all modules on the vehicle. All fuses are good, I reflashed the PCM, Cluster and attempted to reflash the BCM/CJB. The BCM will take the programming but when it is time to check the security function it fails. The key tests good and will pass it's function test. I scoped out MS CAN signals at connector C0580 of the BCM and the signals are good. All inputs from the ignition switch to the BCM at C0582 are accurate. I also checked CAN signals at the Diagnostic plug (OBD-II) to verify integrity of the circuit. 

I concluded that the issue was in the BCM because all inputs were present and the security functions of the vehicle are controlled at the BCM. That was where it kept failing during testing. I installed, programmed and the same symptoms are still present and the vehicle will not start. Everything was performed with factory SDD (not a clone). The one strange thing to me is that while it is programming the BCM the hazards will stop flashing.

I have heard from another technician yesterday that he has had Rovers in with the same symptoms and the issue was in the PCM. No info on how he determined that but am waiting on that answer also. Any insight and additional testing would be much appreciated.

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Paul Technical Support Specialist
Lafayette, Colorado
Paul Default
   

Bob, SDD is not being helpful in your diagnosis? When you describe the symptoms, what is the most highly recommended solution? HMMMM, who supposedly "fixed" the cluster? Recommending a new one is probably a good place to start. BCM harness wiggling, and the vehicle started seems like a path to consider. Security warning lights not flashing while module is being programmed should not be a…

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Solaman Owner/Technician
Chaguanas, Trinidad and Tobago
Solaman Default
 

Hi Bob,did you installed a new genuine BCM and program and copy configuration from PCM to BCM or IPC to BCM ? You must complete security learn and program keys​.​Do vehicle reset and it should start​.​We use Autologic to do this procedure,Lot more easier to do​.​If the red LED is flashing continuously on the Instrument Cluster,it means system did not clear…

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Default
 

Solaman, Yes it was a genuine unit. With SDD you just follow the test plan for configuring new module. It runs through it by its self so I can't answer the question about copying from PCM or IPC to BCM. I do know that there was a step in the process that it asked for a number of some sorts from the steering column. I did not have that number and never had the steering column apart. Sorry I…

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Default
 

Paul I'm guessing not a big fan of SDD, most people I talk to are not LOL. The highly recommended solution question, are you asking what SDD recommended? If so I will have to go back and double check that. I am pretty sure is was to configure existing module for the PCM. I don't know who 'fixed' the cluster.

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Paul Technical Support Specialist
Lafayette, Colorado
Paul Default
 

Is your SDD a yearly subscription? Used to be required to subscribe for the year or you did not get any security functions. We do remote support, mostly European brands. One of my tech support guys is really good at the SDD stuff, he is available to login and see if we can help you. He knows where to go in the SDD software to enable security functions if they are disabled. Call us tomorrow…

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Tommy Owner/Technician
Holly Ridge, North Carolina
Tommy Default
 

Bob, I have 3 things to check that are long shots. Make sure the tail light bulbs are the correct ones, and not internally shorted. I have seen several that when the wrong bulb was installed it would short out part of the Bcm, and cause really strange problems with comms. Check for water ingress in the wire harness channels under the sill plates for both front doors. If it has gotten wet…

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Default
 

Tommy I checked the taillights. I actually unplugged both of them to verify with no change. The water ingress I had already looked into and we were good there. I visually looked at all the connectors behind the battery. The ones at the TCCM and the PCM as well as the others hanging in that area, all in perfect condition and the ground is good also. Thanks.

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Solaman Owner/Technician
Chaguanas, Trinidad and Tobago
Solaman Default
   

Bob,if the BCM is not receiving the hand shake from the IPC,it will not clear the Alarm stage,unfortunately you can barely measure that reading or value,best bet is a new IPC​.​They fail all the time,have seen it a lot,IPC is the Gateway. IPC,am referring to the Instrument Cluster.

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Lorenzo Diagnostician
Collinsville, Oklahoma
Lorenzo Default
 

The instrument clusters usually just need solder connections reworked with leaded solder. Some rebuilders get lazy and just reflow the existing solder joints without cleaning the old non leaded solder. I would remove the instrument cluster and check for broken solder joints or just send it to be repaired by a reputable shop.

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Default
 

I took a good look at the solder joints, it doesn't even look like anyone touched them. You can tell the cluster has been apart but the board looks untouched. Still digging

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Michael Mobile Technician
Clinton, Utah
Michael Default
 

Bob, Just had one of these kick my backside. The problem ended up being a switch in the drivers door. Either the jam switch or the the key switch.

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Boyd Technical Support Specialist
Cartersville, Georgia
Boyd Default
 

In a follow up to the reply from Michael concerning this common failure, if the door switch is worn the alarm system will not refresh when it thinks the door is not closed. If it is in this mode the BCM data will usually be in a foreign language until it is refreshed and cleared.

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Michael Mobile Technician
Clinton, Utah
Michael Default
 

Boyd, That is exactly what sent me down a rabbit hole. I condemned the BCM because it was set to French and it would not respond to the Autologic. Fortunately for all the shop did not want to ship the BCM to the UK and decided to research further. I ended up refunding my fee and apologizing for my mistake. Crow does not taste so good. Thanks for the info, that clears up my misunderstanding of…

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Boyd Technical Support Specialist
Cartersville, Georgia
Boyd Default
 

Trust me Michael, After 55 years in the business I have bedded down with a lot of rabbits! Most of these vehicles come in on a wrecker. If you pull the BCM fuse for about one minute it will normally (not always) refresh from scratch and allow an engine start. you can then pull it inside out of the rain to finish in comfort. It was good to see you at Vision. Stay away from people and be safe.

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William Diagnostician
Austin, Texas
William Default
 

I had the same symptoms on the same vehicle and made the same decision to replace the BCM with the same results. The issue with my vehicle ended up being the cluster.

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Solaman Owner/Technician
Chaguanas, Trinidad and Tobago
Solaman Default
 

Bob,on this issue the fix is never an easy one,you either go with the BCM or the Instrument Cluster.

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Default
   

William what made you go with the cluster?? I'm deep in this now with my time and I want to learn for the possible next time. So a little update for where I'm at. Decided to go back and double check a couple of things and verify integrity of wiring. Lets start with the ohm values at the DLC. Pins 6 and 14 are for HS CAN and have 60 ohms. Pins 3 and 11 are for MS CAN and also have 60 ohms. A…

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William Diagnostician
Austin, Texas
William Default
 

Well I had to go pull the old ticket for my notes. I could also communicate with all modules but had a MS CAN issue. I had 1.2 V key on for pin 3 and 11. Resistance on both HS and MS CAN was 60 ohms as well. Since the cluster is on both HS and MS CAN it makes this more difficult. I also ran a temporary twisted pair from 3 and 11 of DLC to BCM but made no difference. I ended up sourcing a cheap…

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Bob Owner/Technician
Fredericksburg, Virginia
Bob Resolution
 

So after running multiple tests and checking wires at multiple modules here is the conclusion. MS CAN had 60 ohms on it all the time, this pointed to the fact that the MS CAN was never being woken up. I unplugged all modules on MS CAN except CJB and IPC to rule out any one module pulling CAN down and creating an issue. With this being done I still had 60 Ohms all the time. When scoping out the…

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William Diagnostician
Austin, Texas
William Default
 

Glad you got it sorted. Thank you for posting your resolution.

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