The Subaru Select Monitor uses TTL serial communications. It can be found in car audio shops under the product codes "Autoleads PC2-29-4", "Metra 70-1780" or "Scosche SU02B". Some interfaces also require a power connection and therefore have a connection to pin 5.įortunately, the plug required to mate with this connector is the same as the radio connector on the Legacy from 1984-97. Although we don't understand the function of all the pins, the only ones that we need for communications are 2, 3 and 9. The image below shows the pinout of the Select Monitor Connector. It is possible to buy a genuine Subaru Select Monitor either new, or second hand on ebay, but they are more expensive and less versatile than a home-built interface with the right software. This connector is intended for your Subaru dealer to connect their "Select Monitor" diagnostic tool. I've not seen one of these, so I can't say exactly where is is.įor this project we are using the yellow 9-pin connector known as B35. Later model OBD2 cars apparently have a different connector somewhere under the steering wheel.
The same connectors can be found on most Subaru models of this age.
The pinouts of these connectors are documented here. B35 (yellow 9-pin) is the Select Monitor Connector and B36 (black 10-pin) is the Diagnostic Connector. Connector B34 (black 20-pin) is the Manufacturing Check Connector. Sometimes they are wrapped up with a bit of black tape. In the driver's side kick panel of the SVX, there are a bundle of diagnostic connectors. Air Conditioning Unit 4WS Control Unit Cruise Control Unit
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