Do you have an oscilloscope? if you have then you can check for data on the serial wire (pin 9). Without a scope or a diagnostic interface then its difficult to do any further fault finding, you could at least test for 5V on pin 9 if you have a voltmeter.
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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
I found the OBD connector with 3 wires cabled ,as you told near the steering wheel.
I had removed the plastic cover but was looking left side towards the fuse box.
The connector and wiring were hidden below the yellow wiring harness for the airbag.
Unfortunately Rhinoman explained factory tools have no support for the diesel models prior to OBD2, so I'll try reading error codes from the glow plug light.
As far as I can tell the J1962 connector only seems to be used for the immobiliser on these models, the factory tools have no support for the diesel models prior to OBD2. The FSM supplement for your model can be downloaded here:
I don't think you're looking at the correct connector - get down under the steering wheel and look up in the corner where the dash meets the transmission tunnel - you should find a connector that looks like this...
You might be able to locate it a little easier if you remove the panel under the steering wheel - there are either two or three screws along the bottom edge and another one behind the door of the little storage cubby.
-- Edited by fordem on Saturday 18th of May 2013 01:59:28 PM