Someone else reported this previously, the serial link is present but the connector is not. If you have a picture of the circuit board then I may be able to confirm this.
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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.
The early Samurai models do not have a serial diagnostic connection so the SDL interface cannot be used. The 1996-on Samurais use the same ECU as the 96-on Vitara 8V and do have the diagnostic connection.
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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.