Suzuki Swift Sport 2004 Service & Repair Manual page 1007

Step
7 Wire harness check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Measure voltage between "GRY/RED" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON when temperature
selector is operation to HOT direction.
Is voltage 10 – 14 V?
8 Wire harness check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at "G51-3" and "G51-4" terminals.
3) If OK, measure resistance between "GRY/RED" wire
terminal of temperature control actuator connector and
"G51-4" terminal of HVAC control module connector.
Is resistance below 5
9 Wire harness check
1) Measure resistance between "GRY/RED" wire terminal
of temperature control actuator connector and vehicle
body ground.
Is resistance infinity?
10 Wire harness check
1) Measure voltage between "GRY/RED" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
11 Position sensor circuit check
1) Check temperature control actuator position sensor
circuit referring to Step 1 to Step 5 and Step 10 to Step
11 of "DTC B1511: Temperature Control Actuator
(Position Sensor) and/or Its Circuit Malfunction".
Is it in good condition?
12 Temperature control actuator check
1) Check temperature control actuator referring to
"Temperature Control Actuator Inspection".
Is it in good condition?
Action
Ω
?
Air Conditioning System: Automatic Type 7B-59
Yes
Go to Step 11.
Go to Step 9.
Go to Step 10.
Go to Step 11.
Go to Step 12.
HVAC control module
faulty.
No
Go to Step 8.
"GRY/RED" wire open
or high resistance
circuit.
"GRY/RED" wire
shorted to ground
circuit.
"GRY/RED" wire
shorted to other circuit.
Repair circuit.
Temperature control
actuator faulty.