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Old 02-26-2010, 11:55 AM   #1
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Join Date: Jan 2009
Location: East Tennessee, USA
Posts: 44
Enabled my OBC yesterday!

So I took my '01 Boxster S to the local stealership yesterday to have my OBC enabled. I had already wired in a FWL switch to a couple of Bosch relays and tapped into my gauge cluster. By the way, to all who have or will do this hack, most other DIYs on this say you cannot get the lights to work on the switch itself because of the way thew switch is wired. The answer is a simple $5 relay. Use the switch to trigger the relay to turn on a ground. That's how the factory installed switches work.

Anyways, my point was that the service manager (a very nice guy) had no idea of what I was speaking of. I may as well been speaking Martian. After several minutes of explanation, he called a service tech who said he didn't think it would work but he'd give it a try.

The verdict:

15 min later my pretty littler grey car was telling me that it was 37 degrees F outside, my average speed was well below what I had assumed, and that when my foot is on the floor, I'm getting about 9 MPG. (about 23-24 otherwise)

All in all, a pretty cool addition to the car.

Total cost:

about $100.

Stealership charged me $50 for activation
$30ish for FWL switch ( from Suncoast)
$10 for 2 bosch mini SPDT relays (eBay)
$4 for some diodes for the Shack (must use to keep relays from popping through speakers)
$3 for the VW molex wire (from Suncoast)

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Old 02-26-2010, 12:06 PM   #2
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Location: Madison, Georgia
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Very cool!
2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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Old 02-26-2010, 02:04 PM   #3
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Location: Coastal Oak Forest
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Yeah, no matter how many times I reset my average speed, in about a week it is back at around 45 mph.
Same with the average MPG, I reset it out on the highway and get around 28.5, but in a week it's back down around 24.5. We did a cruise last weekend on small 2 lane roads and has the CC set around 65 all day. It hovered around 31 MPG for most of the trip!

Sold - Black on Sand Beige 2006 S - 48K miles
18x8.5 and 10 OZ Alleggerita HLT Anthracite wheels and anthracite Cayman side grilles - lovingly adjusted Schnell Short Shift
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