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Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B0158 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF disconnect the OAT sensor connector.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the driver information center (DIC) displays approximately -40°F (-40°C).
    • If the DIC does not display approximately -40°F (-40°C), test the OAT sensor signal circuit for a short to ground. If the circuit tests normal, replace the HVAC module.
  4. Ignition ON, perform an outside air temperature Instant Update to by pass filtering by simultaneously pressing the following switches on the HVAC control module:
    • AUTO
    • A/C OFF
    • REAR DEFOGGER
  5. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the ground circuit of the OAT sensor. Verify the DIC displays approximately 189.5°F (+87.5°C).
    • If the DIC does not displays approximately 189.5°F (+87.5°C), test the signal circuit of the OAT sensor for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC module.
  6. If all circuits test normal, test or replace the OAT sensor.
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