Air Conditioning System: Automatic Type 7B-55
DTC B1512: Air flow Control Actuator (Position Sensor) and/or Its Circuit Malfunction
S7RS0B7224014
Wiring Diagram
DTC Detecting Condition and Trouble Area
8 Position sensor signal circuit check
1) Measure resistance between “YEL” wire terminal of
temperature control actuator connector and vehicle body
ground.
Is resistance infinity?
Go to Step 9. “YEL” wire shorted to
ground circuit.
9 Position sensor signal circuit check
1) Measure voltage between “YEL” wire terminal of
temperature control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 V?
Go to Step 10. “YEL” wire shorted to
other circuit.
10 Position sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between “ORN” wire terminal of
temperature control actuator connector and vehicle body
ground.
Is resistance below 5
Ω
?
Go to Step 12. Go to Step 11.
11 Position sensor ground circuit check
1) Measure resistance between “G52-3” terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
Ω
?
“ORN” wire open or high
resistance circuit.
HVAC control module
faulty.
12 Temperature control actuator check
1) Check temperature control actuator referring to
“Temperature Control Actuator Inspection”.
Is it in good condition?
HVAC control module
faulty.
Temperature control
actuator faulty.
Step Action Yes No
78
12
910
65 43
1516 14 13 12 11
G52
78
910
1920
12
1112
65 43
1718 16 15 14 13
G51
M
12V
5V
5V
WHT/BLU
WHT
BRN/WHT
BRN/YEL
2
1
ORN
G51-1
G51-2
G52-1
G52-14
G52-3
3
4
I5RS0A722014-01
1. HVAC control module 2. Air flow control actuator 3. To temperature control actuator 4. To other sensors
DTC Detecting Condition Trouble Area
Air flow control actuator position sensor signal voltage is higher than or lower
than specified value for specified time continuously.
• Air flow control actuator circuit
• Air flow control actuator
• HVAC control module
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