B1008

DTC B1008 Passenger Solar Sensor Open or Shorted:

CIRCUIT DESCRIPTION
The passenger sun load sensor is a light sensitive photodiode that controls signal voltage to the HVAC programmer. This photodiode is different from standard thermistor sensors and resistance measurements will not produce accurate results. The HVAC programmer monitors voltage on circuit 1548 to the sensor. When the sensor is in direct sun light, the HVAC programmer reads a low signal voltage at terminal B3. When the sensor is shaded, the signal voltage increases. Signal voltage will vary from 5 V (open circuit) to 0 V (short circuit).

CONDITIONS FOR SETTING THE DTC
^ The ignition is ON.
^ Circuit open or shorted.

ACTION TAKEN WHEN THE DTC SETS
^ The HVAC programmer will default the system to dark or no sun load value.
^ The default value allows the system to operate.

CONDITIONS FOR CLEARING THE DTC
^ Using a Scan Tool
^ A history DTC will clear when 40 consecutive ignition cycles have occurred without a malfunction.
^ HVAC programmer battery voltage is interrupted.

TEST DESCRIPTION
1. Determines whether the sensor is operational.
2. Determines that the DTC was not set in error.
3. Determines if the malfunction is the sensor or an open or short in a circuit.
7. Determines if the HVAC programmer or an open or short is causing the malfunction.