B1330

Steps 1-12:

Schematic:

CIRCUIT DESCRIPTION
The heater and A/C programmer monitors the air temperature in the left A/C duct via a temperature sensor. When the air is cold, the sensor resistance and signal voltage are high. When the air is warm, the sensor resistance and signal voltage are low. The heater and A/C programmer requests A/C clutch engagement and controls the left air mix door position in order to maintain the temperature selected on the driver temperature control.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The heater and A/C programmer 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
^ When Outside Air Temperature (OAT) is at or below 15°C (59°F), a default value of 4.80 V (245 counts) will be used by the heater and A/C programmer. The temperature displayed on the scan tool, 31°C (-23°F) in the HVAC Sensors data list, will be the default value. The actual sensor reading will be displayed on the scan tool in the Open/Short data list.
^ When OAT is at or above 16°C (60°F), a default value of 0.19 V (10 counts) will be used by the heater and A/C programmer. The temperature displayed on the scan tool, 119°C (246°F) in the HVAC Sensors data list, will be the default value. The actual sensor reading will be displayed on the scan tool in the Open/Short data list.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will become history if the heater and A/C programmer 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.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
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.