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DIY P2 Auxiliary Headlight Switch

A mid-size luxury crossover SUV, the Volvo XC90 made its debut in 2002 at the Detroit Motor Show. Recognized for its safety, practicality, and comfort, the XC90 is a popular vehicle around the world. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America). P2 platform.
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GenericVolvoDriver
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Year and Model: '13 XC90 & '12 XC60
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DIY P2 Auxiliary Headlight Switch

Post by GenericVolvoDriver »

Hi everyone,

I thought I would share how to create your own P2 Auxiliary Headlight Switch (low availability of the original Auxiliary Light Kit / I'd prefer to DIY it).

I ordered an interior alarm sensitivity switch and modified the PCB to have it function as an Auxiliary Light Switch (out of stock in North America).

Here are some photos I took of the process - very simple, you just have to remove D1 from the PCB of the switch.

Chose this switch as it was one I didn't have in my CEM panel. I also plan to do some CAN bus work such that it will have other functions if pressed twice, etc. (I'm planning to have it serve as a Ham Radio APRS GPS transponder on/off when the highbeams are off).
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Retreat into to your home electronics lab (6-40x 3D stereo dynascope):
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Switch with silicone pad removed and diode polarity stripes noted if I ever need to replace them:
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Diode D1 removed and saved in tape. Polarity white stripe marked on board with pen:
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You can now plug into connector 54/8 in the engine bay with an appropriate Delphi connector (which I'm trying to source) as per the original accessory harness.
Engine harness side:
Red and black striped wire goes to a 20A fuse in the engine bay fuse box.
Brown and white striped goes to the CEM switched current sink.
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Top:
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Bottom:
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2013 Volvo XC90 AWD Platinum (Climate package, walnut inlays + wheel, BLIS, active bi-xenon headlights) 131k km
2012 Volvo XC60 T6 AWD Platinum (Technology package, climate package) 17k km
2003 Acura TL Type S A-Spec (2007 Accord V6 trans swap, Tein SS, all available engine bolt ons, Apexi AFC, etc.) 108k km
1988 Nissan 300ZX Turbo (2+2, T-top, Aztec Red, collector plates) 80k km

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FMradio
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Post by FMradio »

Thank you so much, this is an awesome procedure to know about!

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