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Discussion Starter #1
Evening All....

Hoping someone can help with a Diagnosis.... 55 Plate E91 330D....

Interior Dome lights / Map light front & Rear + Vanity Lights became Random.
Puddle lights, Footwell lights, Glovebox & Boot lid all worked as Normal....

Now the issue has progressed... When the interior lights are working at some point on a journey the dash will Bong & it lights up all the warning symbols, Speedo & Rev counter flutter.. as soon as these errors stop cycling & i try the interior lights they are now dead.... This sequence happens every time now.... if i open the Door & the Dome lights are working , i know i will get the Dash Errors...

Once the Domelights have Stopped working i cannot access the FZD front dome light control unit or the Rain Sensor unit via the Diagnostics port... When the interior lights do work access can be gained..

Fault Codes include.

4993 - Message Error, (instrument panel) DDE Receiver, instrument Panel Transmitter
49A2 - Message Error, (Ambient temperature) DDE Receiver, instrument Panel Transmitter
A3BC Instrument cluster:message- Communication fault
A3AC Message, Distance travelled, faulty, receiver Kombi, Transmitter DSC
A3AD Message, Engine Data, Faulty, receiver Kombi, transmitter Dme-Dde
A3AE Message, Engine Speed, Faulty, receiver Kombi, transmitter Dme-Dde
A550 Message, Speed, Faulty, receiver Kombi, transmitter DSC
A6D1 Auxillary Water Pump

It would seem that the Can bus is shutting down the Dome light FZD & this would explain the Random working of it, it also appears that the FZD unit is also a canbus gateway


I also believe that the Body control module under the glovebox controls all the Dome lights, vanity lamps, Aucillary water pump & ambient temp monitor...

So is the Body Control unit at fault or indeed the Fzd unit..' What do you all think ?

Dash Lights, include Car on Red Ramp, Tyre pressure, Board Computer, average Mpg, Dsc, Abs, Service Etc....

Main Ecu compartment is as dry as a bone..
 

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Discussion Starter #3
Battery is virtually new & stands at 12.6 volts, 14+ volts when charging.

I have checked all areas for water ingress Etc & can find nothing.....

All controllers / Ecu's can be accessed via diagnostics fine apart from the Fzd unit & anything that runs from it after i have the Dash Errors & the Dome lights stop working.....

Cheers for the Reply ;)
 

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Discussion Starter #5
Should of Stated sorry.. Battery was Registered & coded... These issues started much later than the battery replacement date.....

Its Definitely related in & around the Interior Dome lights.. Just been out, opened Door ... Dome lights working.. Do Journey, Warning Bongs Start..Dash goes crazy.. Bongs stop, Dash settles down.. No interior lights...

Park up, Lock up, Come back hour later , open Door, Dome lights working again. set off on journey home, Same again, Warning Bongs, Dash crazy, Settles Down .. No interior Dome lights or Map / Vanity lights working again !!

Cheers
 

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Discussion Starter #6
I wonder how much would / would not function or grumble if i removed the Front Dome light FZD for testing purposes......
You would obviously say No Rain Sensor, Auto Dip Mirror mirror etc but knowing these cars they would probably stop running & need the Whole car reprogramming again afterwards :D

Cheers
 
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