Air Conditioning System: Automatic Type 7B-54
Visual Inspection
S3RH0A7224009
Check visually the following parts and systems.
DTC B1501 (No.01): Outside Air Temperature Sensor and/or its Circuit Malfunction
S3RH0A7224011
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
Inspection item Correction
• Refrigerant ---- leakage and amount Refer to “Quick Checking of Refrigerant
Charge”.
• A/C pipe or hose ---- disconnection, looseness and deterioration
• A/C compressor drive belt ---- looseness and damage Refer to “Compressor Drive Belt Inspection”.
• Battery ---- fluid level and corrosion of terminal
• Connectors of electric wire harness ---- disconnection and friction
• Fuses ---- burning
• Parts ---- installation and damage
• Other parts that can be checked visually
5V
YEL/BLK
BLK/RED
G77-29
G77-9
2
1
3
9
29
I3RH0A722007-01
1. HVAC control module 2. Outside air temperature sensor 3. HVAC control module connector “G77” (viewed from harness side)
DTC Detecting Condition Trouble Area
• Outside air temperature signal is less than the specified (0.7 V). (Outside
air temperature is less than –44 °C, –111 °F.)
• Outside air temperature signal is more than the specified (3.3 V). (Outside
air temperature is more than 155 °C, 311 °F.)
• “YEL/BLK” and/or “BLK/RED” wire
faulty
• Outside air temperature sensor
faulty
• HVAC control module faulty
Step Action Yes No
1 1) Turn ignition switch OFF, and then disconnect outside air
temperature sensor connector referring to “Outside Air
Temperature Sensor Removal and Installation”.
2) Turn ignition switch ON, and then check voltage
between “YEL/BLK” wire terminal at outside air
temperature sensor connector and body ground.
Is voltage about 3.5 V?
Go to Step 4. Go to Step 2.
2 1) Turn ignition switch OFF, and then disconnect HVAC
control module connector referring to “HVAC Control
Module Removal and Installation in Section 7A”.
2) Check resistance between “YEL/BLK” wire terminal at
outside air temperature sensor connector and “YEL/
BLK” wire terminal at HVAC control module connector.
Is resistance less than 1 M
Ω
?
Go to Step 3. “YEL/BLK” wire open or
high resistance.
3 1) Check resistance between “YEL/BLK” wire terminal and
body ground.
Is resistance more than 1 M
Ω
?
Poor connection of
“YEL/BLK” wire terminal
at HVAC control module
connector, and/or HVAC
control module faulty.
“YEL/BLK” wire shorted
to ground.
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