Suzuki Grand Vitara 2011 Manual page 1577

DTC Detecting Condition and Trouble Area
NOTE
When DTC B1502, B1503, B1511 and B1512 are indicated together, it is that "BLK/RED" wire circuit
open.
Air intake control actuator position sensor signal voltage is more than or less
than specified value for specified time continuously.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
DTC Troubleshooting
Step
1 Position sensor power supply circuit check
1) Disconnect air intake control actuator connector with
ignition switch turned OFF.
2) Check for proper connection to air intake control actuator
at "RED/WHT", "WHT/GRN" and "BLK/RED" wire
terminals.
3) If OK, measure voltage between "RED/WHT" wire
terminal of air flow 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 temperature control actuator connector with
ignition switch turned OFF.
2) Measure voltage between "RED/WHT" wire terminal of
air intake 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 flow control actuator connector with
ignition switch turned OFF.
2) Measure voltage between "RED/WHT" wire terminal of
air intake 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", "G52-22" and "G52-13"
terminals.
3) If OK, measure resistance between "RED/WHT" wire
terminal of air intake control actuator connector and
"G52-14" terminal of HVAC control module connector.
Is resistance below 5
DTC Detecting Condition
Action
Ω
?
Air Conditioning System:
Trouble Area
• Air intake control actuator circuit
• Air intake control actuator
• HVAC control module
Yes
Go to Step 6.
Temperature control
actuator faulty.
Air flow control actuator
faulty.
Go to Step 5.
7B-52
No
Go to Step 2.
Go to Step 3.
Go to Step 4.
"RED/WHT" wire open
or high resistance
circuit.