Suzuki Wagon R Manual page 1888

a. To "A/C" fuse (10A) in circuit fuse box
A/C System Inspection of ECM and Its cir-
cuits (M13 Engine Model)
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with couplers
disconnected from it.
Inspection
1) Remove ECM (1) from vehicle.
2) Connect ECM (1) couplers to ECM.
[A]: Fig. A
[B]: Fig. B
2. E22-01
3) Check voltage at each terminal of couplers connected. Refer
to next page and "Inspection of ECM and Its Circuits" in Sec-
tion 6–2.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition switch
is ON.
1. A/C switch 6. Blower fan switch
AIR CONDITIONING (OPTIONAL) 1B-3
11. Main relay