[Tech II]

When you say the OBD II port is not working, how was this determined?

I assume the vehicle starts and runs ok?

I assume you have BAT voltage to pin 16, and grounds at pins 4 and 5.....

What I would do is attach a voltmeter to to pin 2, and observe the voltage......does it stay low or does it stay high? It should not read 12 volts.....

Normally, with the key off, engine off......you should read 5-7 volts.......so, if in the car, with the door shut, no key in the ignition, and your interior light have timed out and shut off, you should be getting a voltage of 5-7 volts....now turn the key on......the voltage should now change, as the car starts communicating........

If your initial voltage is zero, and you turn the key on and it stays at zero, then the data line is shorted to ground, or a module is shorted to ground......

If you are constantly reading 12 volts, something is shorted to Battery voltage......

What you have to do, basically, is with the key off......disconnect a module..... then turn the key on, to see if you get the proper reading on PIN #2.....if you don't, turn the key to off, reconnect the module, and disconnect another one, and then turn the key to on, and check the voltage at PIN #2.....and so on.....

You have several modules in the vehicle.....the BCM, the ABS, the SDM, the IPC, and the PCM......So by disconnecting one module at a time, with the key off, you can find out if it is a module that is the problem......however, if the voltage never changes at pin #2, then it is not a module, it is the Class II data line itself......and that will take some searching to find the problem.....

One other thing, simple scan tools/code readers only read PCM data, they don't read data from ABS, BCM, IPC, or SDM modules.......something like a TECH II scan tool makes it much easier to diagnose this situation.....