Operation CHARM: Car repair manuals for everyone.

B0184

Steps 1-5:




Steps 6-12:




CIRCUIT DESCRIPTION
The HVAC (ECC) module monitors the ambient light on the driver's side of the vehicle via a light sensitive photodiode. The HVAC (ECC) module uses this information to calculate a solar correction that compensates for the effect of the sun on the inside temperature. When the sensor is in direct sunlight, the signal voltage is low. When the sensor is shaded, the signal voltage is high. The HVAC (ECC) module requests A/C compressor clutch engagement and controls the air mix door positions in order to maintain the temperature selected on the temperature controls.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

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

ACTION TAKEN WHEN THE DTC SETS
This test check the left hand Sun Load temperature sensor value stored in the HVAC (ECC) controller. If the value stored is above the calibrated maximum value or below the calibrated minimum value, the DTC shall set. If the code is currently set, the actual sensor reading shall be displayed on the scan tool.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the HVAC (ECC) 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
Check the following conditions:
- Visually inspect the sensor for contamination or damage.
- Verify that exposure to sunlight is not obstructed.
- Verify that the sensor is installed properly.
- Refer to Testing for Intermittent and Poor Connections in diagrams.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
8. Tests for the possibility of a short to another 5 V reference circuit.