How to reprogram light and rain sensor
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Newbie
Joined: Jun 2017
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WDDHF7CB8AA033126
How to reprogram light and rain sensor
Hi I have a E550 W212 2010 , I am experience a problem with the light and rain sensor , I bought a new sensor but when I install it control the wipers but not the auto light it say auto lamp function inoperative. It that require a reprogram to the sensor. Please if some one know a little help please thanks
Newbie
Joined: Nov 2021
Posts: 4
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2014 E-class
Has to be done by the stealership AFAIK. Its a complicated process that requires coding and some dealerships flat out refuse to do it unless you buy the sensor from them.
Had to replace the windshield on my W212, a very big headache trust me.
Had to replace the windshield on my W212, a very big headache trust me.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Plan B.... FREE fix with 0 coding shortcut!
What issue is that you're having?
"K.I.S.S." ... if you are interested to bypass a $1,500 tab, there's a great chance you can refurb this solderless module yourself under 30mn.
First I suggest you do a quick "battery reboot" (float + disconnect) to restore more reliable SAM activities.
"K.I.S.S." ... if you are interested to bypass a $1,500 tab, there's a great chance you can refurb this solderless module yourself under 30mn.
First I suggest you do a quick "battery reboot" (float + disconnect) to restore more reliable SAM activities.
Last edited by CaliBenzDriver; Feb 13, 2022 at 01:13 PM. Reason: more for less
Junior Member
Joined: May 2009
Posts: 63
Likes: 3
From: Texas
2013 E350 Wagon
Don't quite understand what you are suggesting. What is the $1,500 tab for?
I bought a new light/rain sensor from the dealer for $77. My dealer charges $180/ hour----I can't imagine them taking almost 8 hours of labor
to reprogram the unit.
Please clear this up.
I bought a new light/rain sensor from the dealer for $77. My dealer charges $180/ hour----I can't imagine them taking almost 8 hours of labor
to reprogram the unit.
Please clear this up.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Parts counter vs. Service Dept
Here's a quote from a recent W212 thread:
"The MB dealer here in the UAE is utterly useless and ridiculously overpriced and I have no interest in taking the car to them since they are never of any help."
Different place & experience!
Last edited by CaliBenzDriver; Mar 21, 2022 at 01:07 PM.
Junior Member
Joined: May 2009
Posts: 63
Likes: 3
From: Texas
2013 E350 Wagon
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Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
happy ending...
A 2009 C204 owner replaces his light sensor and gets a shop to code it for $100.
Take that to the dealer and ask for "price match". My dealer used to match oil changes.
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Junior Member
Joined: May 2009
Posts: 63
Likes: 3
From: Texas
2013 E350 Wagon
CaliBenzDriver:
Please explain this:
"First I suggest you do a quick "battery reboot" (float + disconnect) to restore more reliable SAM activities. "
What is this "float+disconnect?" My battery is VERY heavy and would be very difficult to float. Please explain the procedure so that I can try this on my E350. I just replaced the Light Sensor module and it does not seem to be working, aside from giving me this message: Auto LampFunction Inoperative. Have tried the reset procedures which do nothing.
Please explain this:
"First I suggest you do a quick "battery reboot" (float + disconnect) to restore more reliable SAM activities. "
What is this "float+disconnect?" My battery is VERY heavy and would be very difficult to float. Please explain the procedure so that I can try this on my E350. I just replaced the Light Sensor module and it does not seem to be working, aside from giving me this message: Auto LampFunction Inoperative. Have tried the reset procedures which do nothing.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Batt float...
Floating is the very last stage of battery charging done @ 12.6V.
This ensures a complete charge. I happen to use an automatic CTEK smart charger. Other brands can reach this step.
Disconnecting is done by removing (-) side terminal to chassis. Stay away from the (+) side!
Rebooting is what happen to the 40+ computers after reconnecting the battery power to the car.
This ensures a complete charge. I happen to use an automatic CTEK smart charger. Other brands can reach this step.
Disconnecting is done by removing (-) side terminal to chassis. Stay away from the (+) side!
Rebooting is what happen to the 40+ computers after reconnecting the battery power to the car.
Last edited by CaliBenzDriver; Mar 22, 2022 at 06:44 PM.
