Suzuki Grand Vitara 2011 Manual page 1566

7B-41 Air Conditioning System:
DTC Troubleshooting
NOTE
When DTC B1502, B1503, B1512 and B1530 are indicated together, it is possible that "BLK/RED" wire
circuit open.
Step
1 Position sensor power supply circuit check
1) Disconnect temperature control actuator connector with
ignition switch turned OFF.
2) Check for proper connection to temperature control
actuator at "RED/WHT", "WHT/RED" and "BLK/RED"
wire terminals.
3) If OK, measure voltage between "RED/WHT" wire
terminal of temperature control actuator connector and
vehicle body ground with ignition switch turned ON.
Is voltage 4 – 6 V?
2 Position sensor power supply circuit check
1) Disconnect air flow control actuator connector with
ignition switch turned OFF.
2) Measure voltage between "RED/WHT" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 4 – 6 V?
3 Position sensor power supply circuit check
1) Disconnect air intake control actuator connector with
ignition switch turned OFF.
2) Measure voltage between "RED/WHT" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 4 – 6 V?
4 Position sensor power supply circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at "G52-14", "G52-27" and "G52-21"
terminals.
3) If OK, measure resistance between "RED/WHT" wire
terminal of temperature control actuator connector and
"G52-14" terminal of HVAC control module connector.
Is resistance below 5
5 Position sensor power supply circuit check
1) Measure resistance between "RED/WHT" wire terminal
of temperature control actuator connector and vehicle
body ground.
Is resistance infinity?
6 Position sensor power supply circuit check
1) Measure voltage between "RED/WHT" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
Action
Ω
?
Yes
Go to Step 6.
Air flow control actuator
faulty.
Air intake control
actuator faulty.
Go to Step 5.
Go to Step 6.
Go to Step 7.
No
Go to Step 2.
Go to Step 3.
Go to Step 4.
"RED/WHT" wire open
or high resistance
circuit.
"RED/WHT" wire
shorted to ground
circuit.
"RED/WHT" wire
shorted to other circuit.