Obd reset The OBD ses light on my 1994 suburban comes on at aprox 70mph under acceloration. when i short pins 1+2 to get the reading it shows loads of codes.... I am unsure when this was last reset and so i wonder what pins you short together to reset the obd??

Some versions use another location. It is on the knee panel on the driver's side. It is a 'clip in' cover plate just below the dash switch's between the steering wheel and the door. Attached is a photo to use for reference.

http://www.obd-codes.com/faq/read-gm-2-digit-obd-codes-free.php

What year an make vehicle ? Before 1996 you can do that on some make vehicles , not all ,GM cars mostly ! 1996 an above need scanner for all vehicle makes !

follow this link to u-tube to show how to read code obd 1 which is what your flashing light is telling you
Lincoln town car paper clip code trick1

No OBD 1 or 2 Malfunction Lights will go off,until
the fault that caused them to come on is fixed

If you clear them they will come back

If you clear them ALL data is lost & delays the
diagnostic process to find & repair the vehicle

I think you best to study OBD Systems on the internet
as that technology OBD1 started in 1981 & OBD2 in 1996

I have a 1999 BMW 740 il My SES light came on so I hooked up my OBD code reader p0340 - Camshaft Position Sensor Circuit Malfunction is what came up. so I went to the BMW parts department and bought the Camshaft Position Sensor.
I Replaced the with the new. My SES light was still on so I hooked up the OBD reader again hoping it may reset my SES light but it didn't what did happen is the OBD reader came up with the same code (p0340 - Camshaft Position Sensor Circuit Malfunction) witch is what I just replaced. now I'm at a loss. I'm not sure how to reset my SES light and if I just replaced the Camshaft Position Sensor why dose it the OBD code p0340 still come up. Any suggestions?

has a short in the wires

yes. you must read the codes from the flashing red and green lights on your ECU which is beneath your passenger seat. Rather than go into the gory details on how to do this, please refer to the instructions located at the following link. http://npora.ipbhost.com//index.php?showtopic=21

Here is a photo of the obd connector on a 1993 Isuzu Trooper.

The connector is on the transmission hump about 6 inches from the accelerator pedal. It is inside a black hood. Right next to the white OBD connector is an identical green connector that I have not tested.

The OBD port is a white 3 hole plug. Right next to it in the photo is a green 3 hole plug that I believe is for automatic transmission diagnostics. The plug is different from other plugs under the dash as it will not accept a .25" tab connector.

The picture shows a 20 ohm resistor being used to short pin 1 and 3 of the white plug. The resistor is to prevent a melted wire in case the plug shorted is the wrong plug.

To read the error codes from the engine computer, the mechanic is supposed to short pin 1 and pin 3 of the OBD port plug. Then the mechanic turns on the ignition switch and counts flashes of the "check engine" light to determine the error values being reported.

it might but the obdll starts at 96 and up,but there is another conector under the hood on the passenger side for check engine codes.you can buy a ford code reader to do that with there about 50 dollars.if it does have the obdll it should be under the drivers side dash