auto light function inoperative
Thread Starter
Newbie
Joined: May 2020
Posts: 2
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x204, w204
auto light function inoperative
hello, i have this US 2010 x204 4matic , does anyone know under Front SAM module there is b225f-(45 or 49 (i forgot if its 45 or 49))" light sensor malfunction." code.
i tried to search on alldata no code exist.
rain light sensor was replaced with oem part"a2049013003" by someone, no tint on windshield.
found some dried water mark in overhead control panel, then replaced with new even it was getting power.
what i know so far the the it senses rain or water, no weird activity, just working normally when its on auto wipe mode.
all headlamp switch works except standing parking light doesn't work when turned right nor left. Auto light works but doesn't turn off when i put a flash light flashing towards the sensor on windshield.
checked wires seems like it routes from light rain sensor to OCP to power roof module? to CANbus distribution then to front SAM.
I noticed in CGW list there is no OCP module installed but then i didn't see power roof module or maybe i missed it,
does SAM has to be reprogrammed in order to get Light sensor to function and get rid of auto light function inoperative? or is it because of standing parking light is not working due to bad switch but everything else is working? and if i open the door the OCP interior light comes on normally.
Any help would be appreciated.
i tried to search on alldata no code exist.
rain light sensor was replaced with oem part"a2049013003" by someone, no tint on windshield.
found some dried water mark in overhead control panel, then replaced with new even it was getting power.
what i know so far the the it senses rain or water, no weird activity, just working normally when its on auto wipe mode.
all headlamp switch works except standing parking light doesn't work when turned right nor left. Auto light works but doesn't turn off when i put a flash light flashing towards the sensor on windshield.
checked wires seems like it routes from light rain sensor to OCP to power roof module? to CANbus distribution then to front SAM.
I noticed in CGW list there is no OCP module installed but then i didn't see power roof module or maybe i missed it,
does SAM has to be reprogrammed in order to get Light sensor to function and get rid of auto light function inoperative? or is it because of standing parking light is not working due to bad switch but everything else is working? and if i open the door the OCP interior light comes on normally.
Any help would be appreciated.
Last edited by MEDI0DARK; May 17, 2020 at 07:36 PM.
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Joined: Sep 2015
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Likes: 342
2013 glk 350
I don’t understand your description, the light sensor I do not think is also the rain - wiper sensor . A pulsing or any flashlight may not be bright enough to trigger the sensor for lights. Daylight is needed
Thread Starter
Newbie
Joined: May 2020
Posts: 2
Likes: 0
x204, w204
hello, i gotta edit that the code for "light sensor malfunction "is B225F-54, so i got the code wrong before. i have not found anything related to this particular code thru google nor prodemand and alldata. i dont have BENZ star scanner.
When there's rain it wipes automatically and normally and it happens to be raining today the car has been parked outside after sensor was replaced, and the light switch works.
the sensor was replaced at the glass shop due to bad sensor someone diagnosed. so 20min of driving back code still exist.
Even if the car is under the sun while driving or parked it will still display "auto light function inoperative" as soon as car is running ( not with ignition on or off ) and the code still exist. tried to clear but code still exist under Front SAM module category on scanner.
checked wiring again today just to make sure i didnt miss anything found nothing but good wires also performed a continuity tests, and took out SAM module back panel to check back of the circuit board but dry as bone, no moisture no burnt mark on circuit board.
When there's rain it wipes automatically and normally and it happens to be raining today the car has been parked outside after sensor was replaced, and the light switch works.
the sensor was replaced at the glass shop due to bad sensor someone diagnosed. so 20min of driving back code still exist.
Even if the car is under the sun while driving or parked it will still display "auto light function inoperative" as soon as car is running ( not with ignition on or off ) and the code still exist. tried to clear but code still exist under Front SAM module category on scanner.
checked wiring again today just to make sure i didnt miss anything found nothing but good wires also performed a continuity tests, and took out SAM module back panel to check back of the circuit board but dry as bone, no moisture no burnt mark on circuit board.
