Suzuki Wagon R Manual page 1189

TABLE B-4 A/C SIGNAL CIRCUITS CHECK (VEHICLE WITH A/C)
Ignition switch
Main
fuse
INSPECTION
STEP
1 1) Disconnect ECM connectors with ignition
switch at OFF position.
2) Check resistance between E22-9 terminal and
E23-9 terminal.
3) Is it within specification?
Reference value. See Fig. 1.
At 0_C 6.3 – 6.9 kΩ
At 25_C 1.8 – 2.2 kΩ
2 1) Check voltage at E22-19 terminal under each
condition given in table below.
Ignition switch ON
A/C switch OFF
Ignition switch ON
A/C switch ON
2) Is check result satisfactory?
"HEATER"
Blower fan switch
Blower
fan motor
IGN
ACTION
10 – 14 V
0 – 2 V
GENERAL INFORMATION AND ENGINE DIAGNOSIS 6-1-97
A / C switch
A / C
compressor
relay
A / C compressor
YES
Go to Step 2.
Go to Step 3.
IGN
Heater
fan relay
Dual
pressure
switch
Evaporator
thermistor
NO
Faulty A/C evaporator
thermistor or its
circuit.
D "LT GRN/RED" wire
open or short
D Poor E22-19
terminal connection
If wire and connection
are OK, substitute a
known-good ECM and
recheck.