7B-52 Air Conditioning System: Automatic Type
DTC B1504: Sunload Sensor and/or Its Circuit Malfunction
S7RS0B7224012
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
7 Evaporator temperature sensor check
1) Check evaporator temperature sensor referring to
“Evaporator Thermistor (Evaporator Temperature
Sensor) Inspection”.
Is it in good condition?
HVAC control module
faulty.
Evaporator temperature
sensor faulty.
Step Action Yes No
5V
PNK
G52-2
G52-5
YEL/BLK
2
1
78
12
910
65 43
1516 14 13 12 11
G52
78
910
1920
12
1112
65 43
1718 16 15 14 13
G51
I5RS0A722012-01
1. HVAC control module 2. Sunload sensor
DTC Detecting Condition Trouble Area
Sunload sensor signal voltage is higher than or lower than specified value for
specified time continuously.
• Sunload sensor circuit
• Sunload sensor
• HVAC control module
Step Action Yes No
1 Sunload sensor power supply circuit check
1) Disconnect sunload sensor connector.
2) Check for proper connection to sunload sensor at “PNK”
and “YEL/BLK” wire terminals.
3) If OK, measure voltage between “PNK” wire terminal of
sunload sensor connector and vehicle body ground with
ignition switch turned ON.
Is voltage 4 – 6 V?
Go to Step 5. Go to Step 2.
2 Sunload 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 “G52-2” and “G52-5” terminals.
3) If OK, measure resistance between “PNK” wire terminal
of sunload sensor connector and “G52-2” terminal of
HVAC control module connector.
Is resistance below 5
Ω
?
Go to Step 3. “PNK” wire open or high
resistance circuit.
3 Sunload sensor power supply circuit check
1) Measure resistance between “PNK” wire terminal of
sunload sensor connector and vehicle body ground.
Is resistance infinity?
Go to Step 4. “PNK” wire shorted to
ground circuit.
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