2008 A209 CLK... HRA? - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 08-10-2019, 09:25 PM Thread Starter
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2008 A209 CLK... HRA?

Since a couple of months I've been looking for the place of the "Headlamp range adjustment control module" (N71) in my cabriolet. According with the 2008 and 2016 Star finder, it is in the interior, right fron footwell, but it is not there or even around there, or under the passenger side seat.
Anybody of you can tell me where it is please?
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post #2 of 14 (permalink) Old 08-11-2019, 06:41 PM
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Do you know if you have auto-leveling headlights? On USA models, they are included with the with HID/Xenon option. Without that, it is not available. I am not sure what option combinations were available in your country.

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post #3 of 14 (permalink) Old 08-11-2019, 07:12 PM Thread Starter
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Mine is coming from Germany with european standards.
It has range adjustments in the front and rear, main lights are factory HID/Xenon system. xenon (low lights) and H11 for High lights, with autobeam level motors.

They have a ballast under the box and a tranformer inside, just that...

I' using now an aftermarket 55W xenon system connected directly to cables at plugs and one of them is off (left side)

Can be too much watts and CAN B system turns off one automatically to compensate?

Thinking that Front SAM is commanding lights directly, I've bought another and installed it, but still have the same problem

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Last edited by abolt09; 08-11-2019 at 07:14 PM. Reason: Lack of explanation
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post #4 of 14 (permalink) Old 08-12-2019, 09:10 PM
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A failure of a bulb illuminated has nothing to do with the HRA module. That module simply adjusts the angle of the headlights based on the relative angles of the front and rear "axles". If your bulbs are not illuminating, you either have bad bulbs or bad ballasts. Do the OE bulbs/ballasts work? If so, it's the aftermarket stuff that is not working. The SAM does sens current draw to determine if the bulbs are working. For HIDs, it expects 35w, so using a 55w aftermarket system is likely the problem. You could try coding the SAM for halogen bulbs, which are 55w.
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post #5 of 14 (permalink) Old 08-14-2019, 12:02 PM
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Originally Posted by abolt09 View Post
Since a couple of months I've been looking for the place of the "Headlamp range adjustment control module" (N71) in my cabriolet. According with the 2008 and 2016 Star finder, it is in the interior, right fron footwell, but it is not there or even around there, or under the passenger side seat.
Anybody of you can tell me where it is please?
I'm sure that rudeney has given you good advice above regarding lamp wattage.

Regarding your original question about N71 location you have been mis-informed by Starfinder, as it is in the rear passenger foot-well.

It looks like a bit of a hassle to reach it.
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post #6 of 14 (permalink) Old 08-14-2019, 07:58 PM Thread Starter
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Are you saying that HRA box A211 870 31 26 just command actuation of both front and rear sensor inclination???
Strange is that when the problem started it has LED lights for low beam and right side didn't turn on, because no currency at yellow cable and now, with 55w HID the one failing is the left, for the same reason (Yellow-black)... What kind of Gremling do you think I have in my CLK ?
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post #7 of 14 (permalink) Old 08-14-2019, 08:00 PM Thread Starter
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Thank for your response, but have you a surprise... the same I had.
Please check attached picture of my car (LHD). (very clean indeed)

Regards
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post #8 of 14 (permalink) Old 08-14-2019, 08:05 PM Thread Starter
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This is what Xentry say...
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post #9 of 14 (permalink) Old 08-15-2019, 12:52 AM
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Nice photo.

Can you unclip the vent grille as shown in the WIS picture, and remove the floor panel? N71 should be underneath that.

Regarding its' operation, from the circuit diagram below I note that axle sensors A51 and A52 are direct wired inputs to the module, and the control output is via the CAN bus at X63/4.

Does your VIN state CODE 615?
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post #10 of 14 (permalink) Old Yesterday, 06:53 AM Thread Starter
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My VIN is WDB TK54 F08 TO9 3484, and state code 614 which is bixenon for LHD.
Sorry but I cannot understand you about "Can you unclip the vent grille as shown in the WIS picture, and remove the floor panel? N71 should be underneath that".

The attached WIS picture is a drawing showing circuit related N71. Can be specific about what place of the floor panel? (remembering that you, being in the UK are LHD and I'm RHD).

Regards

Last edited by abolt09; Yesterday at 06:56 AM. Reason: wrong words
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