Suzuki GRAND VITARA Owner's Manual page 1152

7B-43 Air Conditioning System:
Step
3 Wire harness check
1) Disconnect connector from air flow control actuator with
ignition switch turned OFF.
2) Check for proper connection to air flow control actuator
connector at "GRY/RED" and "GRY/BLK" wire terminals.
3) If OK, measure voltage between "GRY/RED" wire
terminal of air flow control actuator connector and
vehicle body ground with ignition switch turned ON when
air flow selector is operation to VENT direction.
Is voltage 10 – 14 V?
4 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 "G51-29" and "G51-30" terminals.
3) If OK, measure resistance between "GRY/RED" wire
terminal of air flow control actuator connector and "G51-
29" terminal of HVAC control module connector.
Is resistance below 5
5 Wire harness check
1) Measure resistance between "GRY/RED" wire terminal
of air flow control actuator connector and vehicle body
ground.
Is resistance infinity?
6 Wire harness check
1) Measure voltage between "GRY/RED" wire terminal of
air flow control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
7 Wire harness check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Measure voltage between "GRY/BLK" wire terminal of
air flow control actuator connector and vehicle body
ground with ignition switch turned ON when air flow
selector is operation to DEF 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 "G51-29" and "G51-30" terminals.
3) If OK, measure resistance between "GRY/BLK" wire
terminal of air flow control actuator connector and "G51-
30" terminal of HVAC control module connector.
Is resistance below 5
9 Wire harness check
1) Measure resistance between "GRY/BLK" wire terminal of
air flow control actuator connector and vehicle body
ground.
Is resistance infinity?
Action
Ω
?
Ω
?
Yes
Go to Step 7.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 11.
Go to Step 9.
Go to Step 10.
No
Go to Step 4.
"GRY/RED" wire open
or high resistance
circuit.
"GRY/RED" wire
shorted to ground
circuit.
"GRY/RED" wire
shorted to other circuit.
Go to Step 8.
"GRY/BLK" wire open or
high resistance circuit.
"GRY/BLK" wire shorted
to ground circuit.