Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB20009-3 CONVERTIBLE (9400) L4-2.0L TURBO (B205)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGSOLAR SENSORDESCRIPTION AND OPERATION
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)
Solar Sensor: Description and Operation
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)SECTION Description and Operation
Solar Sensor
The solar sensor is located on top of the dashboard. It mainly measures the infrared radiation (heat radiation).
In case of increased solar radiation and outside temperatures above +15 °C, the ACC control module increases the climate control unit fan speed since additional cooling is required. The fan speed changes immediately when the solar radiation changes.
The fact that the solar sensor mainly measures infrared radiation (heat radiation) means that it cannot be tested using a fluorescent light, sun light or incandescent light must be used.
Adjusting
The ACC unit can be adjusted using the diagnostics tool to consider a greater or smaller amount of the solar sensor value for the cabin temperature calculation.
Diagnosis
In case of an open circuit or short circuit, diagnostic trouble code B1340 is generated, and 03 is shown instead of temperature at calibration.
The latest valid value is used a replacement value. When the ignition is turned on, 0 W/m2 is used.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.