B0348

DTC B0348 Sunload Temperature Sensor Open:

CIRCUIT DESCRIPTION
The heater-A/C control determines the amount of sunlight produced by the sun through an input from the sun load temperature sensor. The heater-A/C control receives a voltage signal from the sun load temperature sensor through circuit 590 (LT BLU/BLK). The sun load temperature sensor is grounded by the heater-A/C control through circuit 61 (YEL).

As the sunlight increases, the electric current flowing through the sun load temperature sensor increases. When the heater-A/C control is in AUTO mode, the heater-A/C control uses the sun load temperature sensor information in order to control the blower speed and the BI-LEVEL modes.

CONDITIONS FOR SETTING THE DTC
The heater-A/C control performs a check on the operation of the sun load temperature sensor and detects an open in circuit 590 (LT BLU/BLK).

ACTION TAKEN WHEN THE DTC SETS
The heater-A/C control stores DTC B0348 in memory.

CONDITIONS FOR CLEARING THE DTC
^ An open in circuit 590 (LT BLU/BLK) is no longer present.
^ Under all fault conditions, the ignition switch must be cycled from on to off, back to on before this DTC can change from current to history.
^ A history DTC clears after 100 drive cycles if a short to ground in circuit 590 (LT BLU/BLK) is no longer present.
^ Using a scan tool

DIAGNOSTIC AIDS
The following conditions may cause this DTC to set:
^ A poor connection or open in circuit 590 (LT BLU/BLK)
^ A poor connection or open in circuit 61 (YEL)
^ A faulty sun load temperature sensor
^ A faulty heater-A/C control

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks for proper voltage value at the sun load temperature sensor.
4. This step checks for a short to ground in 590 (LT BLU/BLK).