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Building your own 160-baud interface 

It is simple and can be performed by anyone who has the most basic understanding of building electronic circuits.

Circuit diagram

This circuit diagram displays the pinouts on the GM-H VN and VP commodores.
US and Europe based vehicle may have different pinouts on the ALDL connector.
See connectors for more information.

Parts list

  • 3 x 10k resistors.
  • 1 x 2N3904 transistor (or equivalent).
  • 1..10 meters 4 core shielded cable (USB cable works well).
  • 1 x solder type DB9 male RS-232 plug and backing shell.
 

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