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What kind of signal do the NAV system want? Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Sat, 2 Aug 2003 09:46:55 In Reply to: Where to find Speedo wire from ECU?, Serendipity, Sat, 2 Aug 2003 05:09:51 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The speedometer is supplied with a ~12V PWM signal from TC/ABS unit, and the ABS unit uses a AC wave signal supplied from left rear wheel sensor.
TC/ABS unit is also sending a speed (PWM) signal to Trionic box.
You find the speedometer signal between pin 30 (TC/ABS) and pin 17 (main instrument), or between pin 30 (TC/ABS) and pin 66 (Trionic).
Be careful though when installing extra equipment so you don't overload an existing circuit, todays cars are so sensitive for voltage fluctuations that it might create another problem if done incorrectly or with parts not compatible with Saabs system.
The same power that is supplied to reverse lights are also found at the DICE unit pin 45. The DICE unit is located under driver side kick panel.
Anders
posted by 63.196.5...
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