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Home >> Cadillac >> 2017 >> CTS Base, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B0158: Ambient Air Temperature Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: B9 Ambient Air Temperature Sensor
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal B (or 2) or 2 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector: P16 Instrument Cluster
    2. Test for less than 2 Ω between the test points: Low Reference circuit terminal B or 2 at Component harness & The other end of the circuit
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: P16 Instrument Cluster
    • If less than 10 Ω 
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Ambient Air Temperature = If 98% or greater
    • If less than 98% 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: P16 Instrument Cluster
    3. Test for infinite resistance between the test points: Signal circuit terminal A or 1 at Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component: P16 Instrument Cluster
    • If 98% or greater 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal A or 1 & Low Reference circuit terminal B or 2
  7. Verify the scan tool parameter: Ambient Air Temperature = Less than 8%
    • If 8% or greater 
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector: P16 Instrument Cluster
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit at Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points: Signal circuit at Component harness & The other end of the circuit
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: P16 Instrument Cluster
    • If less than 8% 
  8. Test or replace the component: B9 Ambient Air Temperature Sensor
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