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 MANUALSSAAB1994900 SE, 4D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICDIAGNOSISRETRIEVING TROUBLE CODES
1994 Saab 900 SE, 4D Hatchback, Automatic
Retrieving Trouble Codes
1994 Saab 900 SE, 4D Hatchback, AutomaticSECTION Retrieving Trouble Codes
- Connect ISAT Scan Tester to data link connector (under left side of dash, next to steering column). Clear any manual programming from A/C-heater control panel (control module) and then road test vehicle.
- Obtain Diagnostic Trouble Codes (DTCs) and write them down on a piece of paper. Perform A/C-heater control panel calibration. See CALIBRATION .
- Obtain DTCs once again and make a note of any additional DTCs. This procedure should be followed, since DTCs B2403 and B2493 can only be detected in connection with calibration.
- Diagnose and test A/C-heater system using relevant trouble codes. After servicing vehicle, perform A/C-heater control panel calibration. See CALIBRATION .
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC (1) | Component/Circuit (Fault) | ||
|---|---|---|---|
| B1343 | Solar Sensor (Open/Shorted Circuit) | ||
| B1347 | Blend Air Sensor (Shorted To Ground) | ||
| B1348 | Blend Air Sensor (Open/Shorted Circuit) | ||
| B1352 | In-Vehicle Temp. Sensor (Shorted To Ground) | ||
| B1353 | In-Vehicle Temp. Sensor (Open/Shorted Circuit) | ||
| B1355 | In-Vehicle Temp. Sensor & Vent Motor Power Supply (Shorted To Ground) | ||
| B1360 | A/C-Heater Control Panel Push Buttons | ||
| B1493 | A/C Output Signal (Shorted To Ground) | ||
| B1498 | Heated Rear Window (Shorted To Ground) | ||
| B1515 | Sensor Ground (Shorted To Battery Voltage) | ||
| B1605 | Control Module (Internal Fault) | ||
| B1675 | Air Distribution Motor Faulty | ||
| B1676 | Recirculation Motor Faulty | ||
| B1677 | Heater Flap Motor Faulty | ||
| B2402 | Air Dist. Stepper Motor (Shorted To Ground) | ||
| B2403 | Air Dist. Stepper Motor (Open Circuit) | ||
| B2404 | Air Dist. Stepper Motor (Shorted Circuit) | ||
| B2405 | Air Dist. Damper Loose | ||
| B2406 | Air Dist. Damper Jammed | ||
| B2413 | Recirculation Motor (Open Circuit) | ||
| B2414 | Recirculation Motor (Shorted Circuit) | ||
| B2422 | Fan Test Voltage (Shorted To Ground) | ||
| B2423 | Fan Test Voltage (Shorted To Battery Voltage) | ||
| B2426 | Fan Control Voltage (Overloaded Circuit) | ||
| B2427 | Fan Control Voltage (Shorted To Ground) | ||
| B2428 | Fan Control Voltage (Shorted To Battery Voltage) | ||
| B2492 | Blend Air Stepper Motor (Shorted To Ground) | ||
| B2493 | Blend Air Stepper Motor (Open Circuit) | ||
| B2494 | Blend Air Stepper Motor (Shorted Circuit) | ||
| B2495 | Blend Air Damper Loose | ||
| B2496 | Blend Air Damper Jammed | ||
|
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RENDER: 1.0x
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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.