Re: Cruise switch upgrade info sought - Saab 900 Bulletin Board - Saabnet.com
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Re: Cruise switch upgrade info sought
Posted by Simon S (more from Simon S) on Wed, 24 Aug 2011 08:49:52
In Reply to: Cruise switch upgrade info sought, Don Wollum, Wed, 24 Aug 2011 05:37:12
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The purpose of the relay was to reverse the "Set" button logic, from "normal closed" to "normally open", which is the newer style, So: it looks like you splice the trigger wire coming from the set button on the stalk, to the wire going to pin 9 of the CC ECU.
Quoted from the saab site:
Pin 2 of the switch sends 12V to the ECU on its pin 2 when SET is depressed on cars equipped with the later switch with a TIP function in a 900. On earlier 900 switches, the SET voltage goes to a relay mounted beside the ECU. It supplies pin 86 of the relay for its pull down coil. Pin 30 of the relay is connected to pin 2 of the ECU and receives 12 V from it. When the relay gets the 12 V from the SET switch, it connects pin 2 of the ECU to Pin 9 of the ECU, and pin 3 of the vacuum pump. this causes the ECU to set the speed in memory.
posted by 24.21.131...
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