[blacksail337]

my drivers side headlight kept going out intermittently a few months ago and has now stopped working completely

car gives me an error every time i start it

tried to scan with the BT tool tonight though and don't see any control modules listed that have anything to do with lighting?

tried things like instrument cluster, central control unit, head up display and it says unable to communicate with any of them

did a short scan of all modules and still nothing headlight related came up in the work log

any help/info much appreciated, thanks

[1QuikWS6]

Here is the model matrix Code reading capabilities from Bavarian Technic. If it's on the list then you should be able to read. If it ain't on the list I guess you're sol...

I don't see anything that lists 'Lighting' specifically, but it does show that you should be able to read codes for Instrument Cluster (which you stated is not working either)

2005-2009 BMW 3-Series E90-E91-E92-E93
Module ECU Identification Read Codes

• DDE6 on 330d 2005 only (engine)
• DDE6 on 318d, 320d (09/2005 - 09/2007) (engine)
• DDE7 on 318d, 320d, 325d, 330d, 335d (engine)
• MV946 on 316i, 318i, 320i, 320si (engine)
• MSV70 on 325i and 330i (engine)
• MSV80 on 328i (engine)
• MSD80/MSD81 on 335i (engine)
• MSS60 on M3 (engine)
• Fuel pump
• Longitudinal mgmt
• Power steering
• Transmission
• Stability control
• Transfer case
• Air conditioner
• Footwell module
• Car access system
• Junction box
• Instrument cluster
• Rain / light sensor
• Telematic
• Airbags
• Roof control
• Seat module - driver
• Radio
• Radio gateway
• Steering
• Convertible top
• Trailer
• Park distance
• Central control

Additional features:
•Condition based service
•New battery registration on 325, 328, 330, 335 - except Diesels

[blacksail337]

contacted bav tech and it's the footwell module that controls and reports headlight related faults.

they also said to keep my hazard lights on while using the bt tool as it prevents the can bus from going into sleep mode preventing some modules from being available

[1QuikWS6]

Ah, good trick!

I didn't think that would affect the operation - assumed the BT Tool/software would 'poll' the various modules to read any values.

On a side note, since I had already purchased the cable needed for coding for $85 - I figured why wouldn't that cable work with the BT software? The BT software is a free download - so I installed the software, hooked up the cable - software recognizes the cable and gives details in the 'Tools' dropdown, but kept giving an error that was cable related.

So unless I did something wrong apparently there is something special about the USB cable BT sells for $200+ ?

[blacksail337]

got it! keeping the hazards on let me connect to all the modules

pulled footwell module fault codes A8AA, A8AC, A8AD, and A8AF

checked mr 5's list in the turbo forum but they're not listed so gotta try to find out what they mean, BT software didn't give any descriptions

[fdriller9]

Dude.....really the hazards? I need to try that

[blacksail337]

haha yea cant say i've ever heard anyone mention it, but owen from bavtech said to do it in an email and low and behold, it worked!

[fdriller9]

Originally Posted by blacksail337

haha yea cant say i've ever heard anyone mention it, but owen from bavtech said to do it in an email and low and behold, it worked!

You would think they would include that in a manual or something....

[blacksail337]

yea i thought the same thing

got it though! pulled it all apart this morning and it was the ballast, swapped em and the headlight that was out came right on

still havn't managed to find out what the fault codes were but i emailed owen at bavtech again so hopefully he'll fill me in