[brake-buster]

got into the car to go to work last night,

no gearbox !!!

the GSM rotary selector would not raise up , and would not rotate, no brake sw clunk , no illumination of GSM switches and no selection indicator light , dash saying gearbox fault , electronic handbrake fault

hmm

strangely , the start/stop button works allowing the engine to fire, and the handbrake switch would apply and release the handbrake,

after multiple attempts , it decided to come to life , so i moved the car off the drive and used another car for work

going to the car today , exactly the same issues, plugged in my code reader and seems i have lost all comms with the GSM etc etc holding x5 codes , , can not clear the codes

car still starts and runs and the handbrake still works , but wont budge an inch......

some investigation required urgently

BB

 

[R1Clarky]

I wonder if its related to the known resistor dry-joint issue? (Was for me a few weeks ago when selector wouldn't move from D) good luck sorting it

Sent from my SM-N960F using Tapatalk

 

[MoJo88]

The same symptoms happened to @ThomasGSX around two weeks ago. Give that thread a quick once over if you get the chance.

 

[brake-buster]

thanks, didn't seem to post a resolution to the issues though ?

update on mine,

after much dismantling of the console and some dash , a replacement GSM and clearing of the codes worked

ps, GSM not coded to car and works perfectly ,

BB

 

[MoJo88]

Yea that's true. But I was more pointing you in the directions of the the location of the correct fuse and the fact that he had spoken to a specialist who said that they think they know what is wrong with it and it needs re-coding.

But at least you managed to sort out your issue and now you're back on the roads 😀

 

[WillieO]

I'm guessing you changed the GSM for one with the same part number. Mine appeared to be acting up the 2nd time on I would start it on a day. Clicking flashing, not engaging gear, getting trans fault warnings. Searching fora gave the very same symptoms to failing GSM. I have two of these at home now. Silly me thought to buy second hand the very latest one I could find thinking surely it is the same thing. Wrong. It seems JLR issue a new part number prefix each year and mine was GX73 etc. JX73 pops up but stops there with the rev counter and speedo needles jumping full scale. A 2nd hand one with the same part number was DOA so being terrified of being left in the wrong place stuck in park I invested in a brand new correct part that was instant on. What did I learn? Well there was nothing wrong with the original one. All this follows a suspected failing battery and an EML lit. Before all this GSM problem I thought plug in my trusty old bluetooth ELM gizmo and see diagnostic stuff on torque pro and sort the EML.
After leaving the darn thing in and watching all kinds of sensor outputs on a tablet when driving I never guessed this was what was causing the GSM problem. Another spell using an Autel gizmo showed loads of communication DTCs registered. I reckon nearly all caused by the previous bluetooth gizmo. The penny only dropped when I tried to see codes yet again with the new GSM in place and that one started acting up. Pulled out the bluetooth dongle and everything GSM wise is fine. I can't watch anorak stuff like active DPF regens in action while I drive now. The DPF hits nearly 600 deg. C! or separate battery and PM voltage and energy recovery when braking too.

Someone who speaks CANBUS and JLR knows what was happening with the Elm Bluetooth. Anyway spare GX73 and JX73 now available . Expensive lesson.

Mine is an X260 but I suspect the GSM was a carry over from the last X250's.

 

[brake-buster]

right

despite Covid, work and weather, and a distinct lack of enthusiasm i have now got a working solution to the issue i stated above

as my car is a 2015 X250 sportbrake , the 'upto 2012' wiring is close, but not correct for my car, its 98% there but certain pin out terminals and inline plug connectors are wired differently , and some different colours were also used for the wires , the wire in question is just up from the bottom of the page below ( 3rd terminal up ) and trace it to the module

three different GSM units were used in this process, each one failing in the same way , even a ' cheap ' very used known faulty one from ebay was used to prove or not prove theories ,

the common issue, no power to the unit,
first i thought it was the ' wake up signal ' this proved to be a dead end, then i thought ignition power, again no result, proved all the high speed can and the LIN systems, , took out the front CJB , checked all terminals, nothing corroded, nothing loose

hmm

got out the multimeter once agin , while running i proceeded to prove power at each pin...hmm , nothing at the ' battery ' connection pin 20 , C33-c/20 , Ye-Rd , this should be full voltage from the engine bay fuse box, fuse 26, 10a ,

so with a spare length of wiring, i pushed in the wire to the load side of the fuse in the engine bay , the load side is the windscreen side pin after testing with meter ,

then , running the wire to the GSM link plug C33-c/20 Ye-Rd i pushed it home, and turned on the ignition

and...IT WORKS !!!!!!

so , this cable goes from the engine fuse box, into the bulkhead, has a splice terminal in the run to the TCM module , and then to a C13-C/16 plug and to the C33-c/20 , it is broken somewhere along the line, though the other module at the splice still works fine, so must be after somewhere

so halfway through the issue i have now discovered the solution , just need to trace back the wire to find the break, or bypass the damaged part permanently,

hope this helps others in some way ,

BB

 

[PeteA]

Well done BB, nice one!!!

Tracing back might be an idea in case there is evidence of a potential for other wires failing at the same place I'd have thought.. though in all honesty I'd probably bypass the break and put the tracing back on the 'to do list' myself...

 

[FCS]

Well done BB nice bit of fault finding

 

[brake-buster]

cheers

final update,

wiring bypassed , permanent fix , seems to run even nicer now, might have had intermittent power issues to the GSM before it failed completely

car no longer in 1000 bits, and i didn't have any parts left over, always a bonus, lol

drove the the nearest garage and filled her belly with premium fuel....

BB