Suzuki Grand Vitara 2011 Manual page 1571

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) Start A/C system and select temperature selector at "MAX COOL" position or "MAX HOT" position.
4) Wait for 1 minute.
5) Check DTC.
DTC Troubleshooting
Step
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC.
Is there DTC B1511?
2 Visual check
1) Check if there is any obstruction in operating range of
actuator linkage and if actuator linkage operates
smoothly.
Is it in good condition?
3 Wire harness check
1) Disconnect connector from temperature control actuator
with ignition switch turned OFF.
2) Check for proper connection to temperature control
actuator connector at "GRY" and "GRY/BLU" wire
terminals.
3) If OK, measure voltage between "GRY" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON when temperature
selector is operation to COOL 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 "G52-27" and "G52-28" terminals.
3) If OK, measure resistance between "GRY" wire terminal
of temperature control actuator connector and "G52-27"
terminal of HVAC control module connector.
Is resistance below 5
5 Wire harness check
1) Measure resistance between "GRY" wire terminal of
temperature control actuator connector and vehicle body
ground.
Is resistance infinity?
6 Wire harness check
1) Measure voltage between "GRY" wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
Action
Ω
?
Air Conditioning System:
Yes
Go to applicable DTC
diag. flow.
Go to Step 3.
Go to Step 7.
Go to Step 5.
Go to Step 6.
Go to Step 7.
7B-46
No
Go to Step 2.
Obstruction in operating
range of actuator
linkage, actuator linkage
faulty and/or internal
fault of HVAC unit.
Go to Step 4.
"GRY" wire open or high
resistance circuit.
"GRY" wire shorted to
ground circuit.
"GRY" wire shorted to
other circuit.