B0184

DTC B0184

CIRCUIT DESCRIPTION
- B0184 is for the left sunload sensor circuit.

The HVAC control module (IPM) monitors the ambient light on the left and right side of the vehicle through a light sensitive photodiode called a sunload sensor assembly. The HVAC control module uses this information to compensate for the effect of the sun on the inside air temperature of the vehicle. When the sensor is in direct sunlight, the signal voltage is low. When the sensor is shaded, the signal voltage is high. The HVAC control module requests A/C compressor clutch engagement and controls the air temperature actuator door positions in order to maintain the selected air temperature on the HVAC control module.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The HVAC control module detects the signal circuit is less than 5 counts (0.09 V) or greater than 250 counts (4.90 V).

ACTION TAKEN WHEN THE DTC SETS
A default value will be used for the sensor data by the HVAC control module. The Solar Sensor displayed on the scan tool in the Instrument Panel Module HVAC Sensors data list will be the default value. The Solar Sensor displayed on the scan tool in the Instrument Panel Module Open/Short Data list will be the actual value.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the HVAC control module no longer detects a failure.
- The history DTC will clear after 50 fault free ignition cycles.
- The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
If condition not present refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-2:

Steps 3-6:

Steps 7-12:

The numbers below refer to the step numbers on the diagnostic table.
2. When diagnosing using this table, DTC B0184 is for the left sunload sensor. DTC B0189 is for the right sunload sensor. Follow table for corresponding circuits for that DTC.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.