Inspection of A/C Controller and Its Circuits
WARNING: This page is about a different car, the 2003 Suzuki Vitara, 2003 Suzuki Grand Vitara, 2002 Suzuki Vitara, and 2002 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
A/C controller (1) and its circuits can be checked at A/C controller wiring couplers by measuring voltage.
CAUTION:
A/C controller cannot be checked by itself.
It is strictly prohibited to connect voltmeter or ohmmeter to A/C controller and ECM with couplers disconnected from it.