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Your car has a speed signal

Posted by alpina22 on 3/8/2006, 9:36 am, in reply to "Traffic pro installation in 1990 C2 Porsche"
216.139.130.67

Easiest method is to locate the wire (red/white IIRC) from the HVAC control panel. Use a DIN radio removal tool to pull the HVAC panel and disconnect the two large connectors. This makes it easier to tap the speed signal wire. To confirm you have located the correct wire, pull the speedometer and find the red/white wire. Set your multi-metre to Ohms. It should register a 1 Ohm load. However, if you probe the red/white wire at speedo and HVAC at the same time, it'll ground the wire giving you a zero load. Did this on a MY91 C4 and it worked 100%.

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Message Thread: Traffic pro installation in 1990 C2 Porsche - JPS 3/6/2006, 9:13 pm Your car has a speed signal - alpina22 3/8/2006, 9:36 am Re: Your car has a speed signal - JPS 3/8/2006, 4:52 pm Behind HVAC panel - alpina22 3/9/2006, 11:09 am Re: Traffic pro installation in 1990 C2 Porsche - TS 3/7/2006, 5:49 am « Back to thread

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