niet alle bekabeling ligt er
The On Board Computer (OBC) option (M659) adds a different tachometer to your car with a small display at the bottom of the tach which displays 6 different functions. It came standard on all Turbos and cars with Tiptronic transmissions. The functions displayed in orange letters, figures and symbols include distance to next fill-up, average MPG, average speed, trip odometer, digital speedometer, and outside temperature. After a couple of months of thinking about trying to add this option and finding all used components, I installed the On Board Computer (OBC) option in my 1996 993 Porsche. Here is a simple write up of how I did the installation.
Porsche parts required:
Outer Temp Sensor: 928 641 142 00
OBC Tachometer: 993 641 312 00 or 993 641 332 00 61W (Carrera S )
Steering Column Switch: 993 613 354 00 01C (headlight washer, OBC, & cruise control) or 993 613 352 00 01C (headlight washer & OBC)
Steering Column Switch Cover: 993 552 573 01 01C
OBC Tachometer connector: Not available separately from dealer, need to find a used part off a 993 tiptronic, Turbo, or 6-speed w/OBC option or use the connector off a 1990-1994 964 w/OBC option.
Other parts needed:
Torx T-30 bit (at least 2" long)
M 24 hex socket
M 6 & M 4 Allen socket
Metric hex socket set (various sizes)
M 6x12 or M 6x16 pan head screw (4X)
20 AWG wire (various colors)
Splices or soldering iron & solder
Male and female butt connectors (red)
Voltmeter (optional)
Electrical tape
Wire ties (various sizes)
PVC wire loom cover (optional)
Rubber grommet
Drill bit set
Dremel or equivalent tool (optional)
993 factory wiring diagram (optional)
Notes on parts:
The OBC tachometer, steering column switch, and the steering column switch cover can all be purchased used to save cost.
The steering column stalk for the OBC is a totally separate piece from the steering column switch and is held on with just two screws and a wire tie so you can buy part 993 613 352 00 01C which is cheaper and just transfer the new OBC stalk to your existing steering column switch regardless of which steering column switch you have.
The OBC tachometer connector is a 26 pin connector that plugs into the back of the OBC tachometer. I do not believe this part is available from the dealer unless you order the entire wiring harness. The connector is made up of a connector surrounded by a plastic shell held together with a wire tie. The connector part numbers are 944 612 551 00 (connector) and 999 652 542 40 (shell). This same connector is used in a couple of different locations in the car. The only differences are the number and the colors of the wires used on the connector. I used a OBC connector off a 1990-1994 964 w/OBC option. This worked out well because this connector has some unused wires which you will need to use later on. The connector to the central indicator (informer) will also work but you will need to modify the position of some of the wires in the connector and the wire colors will not be correct.
Hooking up the OBC tachometer requires the connection of 19 wires. The standard tachometer only has 7 wire connections. 14 of the wires come from the area directly behind the tachometer and from the steering column switch. The remaining 5 wires have to be routed from other parts of the car (DME area, temp. sensor, driver’s side kick panel, and the central indicator (informer) ) to the back of the OBC tachometer. Please use a voltmeter to check the continuity of your connections as you go.
Wire List*
From To Color**
OBC Pin #
1 Pin #4 of clock (+12V power) red
2 Stock tach harness pin #2 (ground) and OBC stalk pin #1 brown
3 Stock tach harness pin #3 (turn signal LH) black/white
4 Stock tach harness pin #4 (high beam) white/black
5 Stock tach harness pin #5 (turn signal RH) black/green
6 Stock tach harness pin #1 (lights) gray/blue
7 Not used -
8 Temp sensor pin #1 blue/green
9 Central indicator (informer) pin #7 beige connector (fuel signal) brown/black
10 Temp sensor pin #2 brown/green
11 Not used -
12 Pin #2 of speedometer (speed signal) white/red
13 Pin #4 of connector behind LH kick panel (door armed signal) green/white
14 Stock tach harness pin #7 (tach signal) orange
15 Stock tach harness pin #2 (ground) brown
16 Not used -
17 Not used -
18 Not used -
19 Not used -
20 Not used -
21 Stock tach harness pin #6 (tach signal) black/violet
22 Pin #6 harness under seat from DME (TI signal) white/green
23 OBC stalk pin #2 white
24 OBC stalk pin #3 green
25 OBC stalk pin #4 blue
26 OBC stalk pin #5 gray
*I only had the factory wiring diagrams for the 1994, 1995 and 1996 model years. I am not sure if there were any change for 1997 and 1998. I do not believe there were any but you may want to check with the wiring diagrams for those years to be sure.
** Wire colors given as color1/color2 means a color1 wire with a color2 stripe. For example a Red/Black wire color means a red wire with a black stripe. The wire colors shown on the list are for reference only you may have different colors in your car depending on the year and what colors you use for your installation.
als je het dan toch nog wil doen hier een volledige beschrijving
http://p-car.com/diy/obc/
robert
.