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 MANUALSSAAB1995900 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICFAULT DIAGNOSISDTC B1515, SENSOR GROUND CIRCUIT
1995 Saab 900 S, 2D Hatchback, Automatic
DTC B1515, Sensor Ground Circuit
1995 Saab 900 S, 2D Hatchback, AutomaticSECTION DTC B1515, Sensor Ground Circuit
NOTE:
DTC B1515 indicates circuit to pin No. 14, 15 or 35 is shorted to battery voltage. This trouble code may set DTC B1343, B1348 and B1353.
- Connect Saab ISAT Scan Tester and verify trouble code(s) by obtaining sensor ground readout. Clear trouble code(s) if voltage is less than 0.5 volt. Ensure trouble code is not repeated. If code is repeated, go to next step.
- Disconnect in-vehicle temperature sensor connector and obtain sensor ground readout again. If voltage is now less than 0.5 volt, short circuit to battery voltage is located in in-vehicle temperature sensor circuit. Repair wiring harness as necessary. If necessary, replace in-vehicle temperature sensor.
- Disconnect mixed (blend) air temperature sensor connector and obtain sensor ground readout again. If voltage is now less than 0.5 volt, short circuit to battery voltage is located in blend air temperature sensor circuit. Repair wiring harness as necessary. If necessary, replace blend air temperature sensor.
- Disconnect solar sensor connector and obtain sensor ground readout again. If voltage is now less than 0.5 volt, short circuit to battery voltage is located in solar sensor circuit. Repair wiring harness as necessary. If necessary, replace solar sensor.
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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.