7B-31 Air Conditioning System:
DTC B1503: A/C Evaporator Air Temperature Sensor and/or Its Circuit Malfunction
S5JB0A7204034
Wiring Diagram
DTC Detecting Condition and Trouble Area
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.
4 Inside air temperature sensor signal circuit check
1) Measure voltage between “BLU/BLK” wire terminal of
inside air temperature sensor connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
Go to Step 5. “BLU/BLK” wire shorted
to other circuit.
5 Inside air temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between “BLK/RED” wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance below 5
Ω
?
Go to Step 7. Go to Step 6.
6 Inside air temperature sensor ground circuit check
1) Measure resistance between “G52-13” terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
Ω
?
“BLK/RED” wire open or
high resistance circuit.
HVAC control module
faulty.
7 Inside air temperature sensor check
1) Check inside air temperature sensor referring to “Inside
Air Temperature Sensor Inspection: ”.
Is it in good condition?
HVAC control module
faulty.
Inside air temperature
sensor faulty.
Step Action Yes No
5V
BLK/RED
WHT/BLK
G52-19
G52-13
[A]
2
3
1
13
19
I5JB0A720021-01
[A]: HVAC control module connector “G52” (harness side view) 2. Evaporator temperature sensor
1. HVAC control module 3. To other sensors
DTC Detecting Condition Trouble Area
Evaporator temperature sensor signal voltage is more than or less than
specified value for specified time continuously.
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
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