B0189

Schematic:

CIRCUIT DESCRIPTION
The Instrument Panel Integration Module (IPM) monitors the ambient light on the passenger's side of the vehicle via a light sensitive photodiode. The IPM uses this information to compensate 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 IPM requests A/C clutch engagement through the PCM 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 IPM detects the signal circuit is less than 0.09 V (5 counts) or greater than 4.88 V (250 counts).

ACTION TAKEN WHEN THE DTC SETS
A default value of 4.88 V (250 counts) will be used for the sensor data by the IPM. The sun load displayed on the scan tool 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 MIL/DTC
^ The DTC will become history if the IPM 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

Steps 1-12:

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.