On board computer retrofit for 986 and 996
The on-board computer retrofit for 996 & 986 models is a simple and straight-forward conversion to perform.
The cable we sell (pictured) is designed to integrate with the wiring loom fitted to your car and a set of steering column stalks that have the necessary OBC stalk. Whilst you can make these yourself it can be awkward to work out the connections and source the connectors.
To fit the retrofit simply disconnect the battery, remove the airbag, steering wheel, and clock spring after following the requisite safety procedures. Replace the current stalks with those giving the extra functionality and connect the cable. Remove the instrument cluster.
Screw the earth tag on the cable end to a suitable grounding point, insert the remaining cable ends into their relevant connection points on the instrument cluster and refit all items.
More details instructions with pictures are available on other websites shown at the bottom of this page.
OBC retrofit connections
Please note : connections are reproduced as guidance only - you should check your vehicles wiring diagram to confirm your actual requirements as model/registration introduction dates can vary.
996 Carrera 1999-2000, 986 1997-2000
Instrument cluster connectors coloured Blue White and Black
Connector Pin #2 - Gauge Cluster White Pin #20 - Select Mode Down
Connector Pin #3 - Gauge Cluster White Pin #21 - Speed Alert/Gong
Connector Pin #4 - Gauge Cluster White Pin #22 - Select Mode Forwards
Connector Pin #5 - Gauge Cluster White Pin #25 - Select Mode Backwards
996 2001-2004, 986 2001-2004
Instrument cluster connectors coloured Green, Blue, and Grey
Connector Pin #2 - Gauge Cluster Grey Pin #23 - Select Mode Down
Connector Pin #3 - Gauge Cluster Grey Pin #22 - Speed Alert/Gong
Connector Pin #4 - Gauge Cluster Grey Pin #21 - Select Mode Forwards
Connector Pin #5 - Gauge Cluster Grey Pin #24 - Select Mode Backwards
After fitting it will then be necessary to have your vehicle coded with the extra option for the OBC to work.
Note - To prevent the airbag warning lamp from illuminating, the battery should not be connected with the airbag disconnected.
On board computer retrofit cable for 996 / 986 models