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Blind spot radar sensor replace

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Old Feb 19, 2024 | 02:37 PM
  #1  
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W251 w212
Blind spot radar sensor replace

Hi.
found corroded old radar sensor so ordered new on ebay. It should be same number than old. But when arrived it not have all numbers same. Try still install it. No luck. When plugged also "lane keep assist" says error.
does it need some coding by xentry? Or are problem that not all same numbers?


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New one
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Old Feb 19, 2024 | 05:12 PM
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Have you checked the condition of the chassis-side connector ??? A lot of time a new section of harness is necessary due to pins wasted by rain.

The rear modules are sayed not to need programming if P/N match. Go ahead and read what your replacement are reporting.


Do yourself a favor, be sure to silicone RTV all exposed connectors: both rear + front end.
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Old Feb 19, 2024 | 08:18 PM
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CBD, what are your thoughts on silicone GREASE instead of silicone RTV? I've used the grease on connectors with (so far) a 100% success rate. Sure makes it easier to take the connectors apart in the future, compared with RTV.
Or am i missing something and we're actually talking about the same thing?
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Old Feb 19, 2024 | 11:39 PM
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Originally Posted by CaliBenzDriver
Have you checked the condition of the chassis-side connector ??? A lot of time a new section of harness is necessary due to pins wasted by rain.

The rear modules are sayed not to need programming if P/N match. Go ahead and read what your replacement are reporting.


Do yourself a favor, be sure to silicone RTV all exposed connectors: both rear + front end.
Chassis side connector is also replaced. P/N number end is different. 18A vs 08A
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Old Feb 20, 2024 | 01:19 AM
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BIG QUESTION...

Originally Posted by rapidoxidation
CBD, what are your thoughts on silicone GREASE instead of silicone RTV?

I've used the grease on connectors with (so far) a 100% success rate.
Sure makes it easier to take the connectors apart in the future, compared with RTV.
Or am i missing something and we're actually talking about the same thing?
RapidOx: we know protection is needed against oxidation of contact surfaces. Everything is undersized to become aged by current conduction and heat generated by contact resistance.

Master Surya and I came to agreement against silicone lube to protect contacts.

So what is proven best to protect high-heat contact in the long run when oil will be evaporated??


RTV is perfect outside the connector where wires penetrate through easily compromised seals. That's what I am advocating to RTV seal.

I have not treated connectors contacts but dislike oxidation.
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Old Feb 20, 2024 | 09:54 AM
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To rule out an issue with the harness, try swapping the radar sensor with the opposite side. If the problem moves then you know it's the sensor. I was able to find a used one on ebay with matching numbers and it worked fine plug and play.
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Old Mar 24, 2024 | 08:08 PM
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Originally Posted by CaliBenzDriver
RTV is perfect outside the connector where wires penetrate through easily compromised seals. That's what I am advocating to RTV seal.
Cali, great idea. I will coat the connector where the wires enter with RTV.
Do you see any benefit from putting RTV around the sides of the connector also?
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Old Mar 25, 2024 | 01:03 PM
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RTV seal outside

Originally Posted by ghlkal
Cali, great idea. I will coat the connector where the wires enter with RTV.

Do you see any benefit from putting RTV around the sides of the connector also?
You can never use too much RTV... to keep contacts in dry condition. Even if you want to seal all around the connector outside... is good insurance water can not penetrate through. ✌️

Last edited by CaliBenzDriver; Mar 25, 2024 at 01:23 PM.
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