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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gauges >> Diagnostic Information and Procedures >> DTC B0160 or B0161 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit terminal B for an open/high resistance. If the circuit tests normal, replace the IPC.
  3. Ignition ON, verify the driver information center (DIC) displays "OC".
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the IPC.
  4. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the DIC displays "SC".
    • If not the specified value, test the signal circuit terminal A for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
  5. If all circuits test normal, test or replace the ambient air temperature sensor.
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