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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Lumbar retrofit ?



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      02-07-2013, 04:13 PM   #1
Alpineis
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Lumbar retrofit ?

My '11 335is with heated dakota leather sport seats has power everything but no lumbar. I didn't think it would bug me, but it is.. Anyone heard of a retrofit for this ?
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      02-07-2013, 04:39 PM   #2
m_335d
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I think it is possible but you need to buy OEM parts and run additional wires to the lumbar switch.
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      02-07-2013, 05:25 PM   #3
smallseafishie
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You'll need the lordosis bag, the switch, and the wiring harness.

You can grab a junkyard seat for these parts.

Remove seat and the back cover. Install lordosis pad behind the spring mesh assembly. Run wiring harness down and tap it into the 12V supply (Big thick brown is negative and big thick Red is positive) of the mating harness. Use a dremel to punch out the cutout for the switch. Reinstall and you're done.

The hardest part of the whole thing is removing the plastic piece where the switch goes. Be patient and you'll be able to find all the correct releasing tabs.

Good luck
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      02-07-2013, 05:27 PM   #4
smallseafishie
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Just as another word of advice, it doesn't matter if the donor seat is sports or standard. The lumbar support is the same between the two.

If you get the same type of seat, then the wiring harness would be a direct swap over.
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      02-07-2013, 06:08 PM   #5
Alpineis
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Thanks for the info. I will search some pn's and pricing.
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      02-07-2013, 06:22 PM   #6
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I spoke with some at dealer (parts) said no fix! lol
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