B1504

DTC B1504-H/L: Sunload Sensor and/or Its Circuit Malfunction

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.

DTC Troubleshooting

1. Sunload sensor power supply circuit check

Disconnect sunload sensor connector with ignition switch turned OFF.
Check for proper connection to sunload sensor at "PNK" and "YEL" wire terminals.
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?
YES -
Go to Step 5.
NO -
Go to Step 2.

2. Sunload sensor power supply circuit check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Check for proper connection to HVAC control module connector at "G52-12" and "G52-19" terminals.
If OK, measure resistance between "PNK" wire terminal of sunload sensor connector and "G52-19" terminal of HVAC control module connector.

Is resistance below 5 ohms?
YES -
Go to Step 3.
NO -
"PNK" wire open or high resistance circuit.

3. Sunload sensor power supply circuit check

Measure resistance between "PNK" wire terminal of sunload sensor connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 4.
NO -
"PNK" wire shorted to ground circuit.

4. Sunload sensor power supply circuit check

Measure voltage between "PNK" wire terminal of sunload sensor connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 5.
NO -
"PNK" wire shorted to other circuit.

5. Sunload sensor signal circuit check

Disconnect HVAC control module connector with ignition switch turned OFF.
Measure resistance between "YEL" wire terminal of sunload sensor connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 6.
NO -
"YEL" wire shorted to ground circuit.

6. Sunload sensor signal circuit check

Measure resistance between "G52-12" terminal of HVAC control module connector and "YEL" wire terminal of sunload sensor connector.

Is resistance below 5 ohms?
YES -
Go to Step 7.
NO -
"YEL" wire open or high resistance circuit.

7. Sunload sensor signal circuit check

Measure voltage between "YEL" wire terminal of sunload sensor connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 8.
NO -
"YEL" wire shorted to other circuit.

8. Sunload sensor check

Check sunload sensor referring to Inspection Sunload Sensor Inspection.

Is it in good condition?
YES -
HVAC control module faulty.
NO -
Sunload sensor faulty.