citren c4 strange poblem.

[gccb]

hi got here in my worshop an 2011 citroen c4. the most of times when start car and engine worm, ther is no acceleration , no power assit and maybe other problems that i did not realize.
when prolem happens i got no communication with bsi either with power management ecu located on the battery.
tried with other bsi , nothing changed,unpluged energy module the same.
any one can shine my road??
regards.

[Kalimero005]

You have a Dream ,car repair. You dont write Vin , Engine .You think all Peopole to know,what a car you repair ? Think about ,what need car elektriker if he need repair a car.

[pawl]

hello what voltage alternator charging?

[fuzz1]

Check for water ingress. Or just open the bsi and have a look. You might get lucky

[gccb]

it's citroen c4 from 2011 1.6hdi with edc17c10 ecu.when problem happens only when car is worm, there is no acceleration not respônding at all ,engie rpm is very low , no power steering, no charging alternator, but sometimes if i leave car ideling for a while all symptoms disapears alternator is charging, steering power on, idle rpm on 820 tr/min and i can accelerate. if shut engine for 1 hour , car is cold and all working good.
i can notice when problem happens ican't communicate with bsi , battery charging module an power distribution module placed upon the battery but if i shut engine i can communicate , the strange thing is all cited moules are connected with lin bus, i tried dsconnecting module after module notthing changes.i tried changing bsi nothing changed. no water ingress.
im stuck.
please help

[pawl]

it looks like you have a communication short-circuit when the modules are heated, maybe you need to disconnect it one by one? dasch board

[mastaflex]

or battery problem

[gccb]

tried with good battery, same problem.
sure someone here had similar problem on c5/c4 508 ds4 /ds5.
need your help please.
i will have car for second time monday ,i promess customer to fix problem so i will sacrifice all my knowledge and time ,please if some one have any idea iwill be grateful and i promess if i find solution i will share it with you.
other thing in bsi i got B162C 12 as dtc.
regards

[Zmann]

There must be a unit called BPGA on top of battery for distribution several branches of battery supply to units. Try making bypass the main branch e.g. jumping across the two big bolts.