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Author Topic: 3rd row blower / vents not coming on  (Read 106 times)

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June 04, 2018, 08:46:57 PM

Chrispy

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  • 2012 E70 3.0 XDrive M Sport
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3rd row blower / vents not coming on
« on: June 04, 2018, 08:46:57 PM »
Hi all,

In the saga of diagnosing why my front dash vents won't come on at all (defrost / windscreen only) I've noticed that the 3rd row vents won't come on either.  Press the little button and the LED doesn't light up - nothing happens.  :( 

I'm on a blown fuse mission anyway (which helped me figure out why my power outlet in the boot doesn't work :) ) but struggling with these other issues.

Spotted I'm missing fuse 126 from the boot fuse box but having borrowed another 5A fuse to pop in there temporarily whilst I buy some more of the little fuses, it's made no difference.

Anyone else had this?

Ta,

Chris.
Black 2012 E70 3.0 XDrive M Sport on diddy 19's

June 05, 2018, 07:53:28 AM
Reply #1

June 05, 2018, 04:44:45 PM
Reply #2

Chrispy

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Re: 3rd row blower / vents not coming on
« Reply #2 on: June 05, 2018, 04:44:45 PM »
This was an interesting read....

https://testing-public.carmd.com/Tsb/Download/107491/SI%20B64%2004%2015

About how ISTA cannot diagnose the 3rd row control unit .  Tempted to pull it apart and see if it's getting a 12v supply.  Could be the microswitch that's faulty, as simple as that.

Actually recommends a full power cycle on the car so I think a battery pull might be in order.
Black 2012 E70 3.0 XDrive M Sport on diddy 19's