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HOMESERVICE MANUALSSAAB1994900 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICDIAGNOSISDTC B1352 & B1353, IN-VEHICLE TEMPERATURE SENSOR CIRCUIT
1994 Saab 900 Base, Standard

DTC B1352 & B1353, In-Vehicle Temperature Sensor Circuit

1994 Saab 900 Base, StandardSECTION DTC B1352 & B1353, In-Vehicle Temperature Sensor Circuit
NOTE: DTC B1352 indicates circuit to pin No. 33 is shorted to ground. DTC B1353 indicates circuit to pin No. 33 is open or shorted to battery voltage.
  1. Connect Saab ISAT Scan Tester and obtain interior (in-vehicle temperature) sensor readout. Value should be 1-4 volts and temperature should coincide with that of ambient air.
  2. Disconnect in-vehicle temperature sensor connector and measure voltage at connector pin No. 2 (Yellow/Brown wire) and pin No. 3 (Yellow/Blue wire). Voltage should be 4.5-5.0 volts. If voltage is correct, go to next step. If voltage is incorrect, go to step 4).
  3. Measure resistance across in-vehicle temperature sensor pin No. 2 and 3. Sensor resistance should be as specified in IN-VEHICLE TEMPERATURE SENSOR RESISTANCE TABLE. If resistance is correct, go to next step. If resistance is incorrect, replace sensor. Clear DTC and ensure fault has been corrected.
  4. Disconnect A/C-heater control panel connector. Attach breakout box to A/C-heater control panel wiring harness connector. Check wiring harness for continuity between sensor connector pin No. 2 (Yellow/Brown wire) and pin No. 15 at breakout box.
  5. Check wiring harness for continuity between sensor connector pin No. 3 (Yellow/Blue wire) and pin No. 33 at breakout box. If wiring harness continuity is not okay, repair open circuit(s). If wiring harness continuity is okay and fault persists, replace A/C-heater control panel.
IN-VEHICLE TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C) Ohms
32 (0) 30,000-34,900
50 (10) 18,500-21,100
68 (20) 11,700-13,100
86 (30) 9500-10,500
104 (40) 7600-8500
RENDER: 1.0x

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