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Home >> Buick >> 2012 >> Regal GS, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Outside Air Temperature Display Malfunction - DTC B0158 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B9 ambient air temperature sensor.
  2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the P16 instrument cluster.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.
  3. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Ambient Air Temperature Sensor parameter displays 0%.
    • If greater than the specified value, test the low reference circuit a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.
  4. Verify the accuracy of the B9 ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Resistance .
    • If not within the specified range, replace the B9 ambient air temperature sensor.
  5. If all circuits test normal, test or replace the B9 ambient air temperature sensor.
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