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Home >> Cadillac >> 2018 >> CTS Base, AWD >> 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

    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 ohms between the test points: Low Reference circuit terminal B or 2 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: P16 Instrument Cluster
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal B or 2 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: P16 Instrument Cluster
    • Go to next step: If less than 10 ohms 
  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 @ 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
    • Go to next step: If 98% or greater 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal Aor1 & Low Reference circuit terminal Bor2
  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@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:Signal circuit @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:P16 Instrument Cluster
    • Go to next step: If less than 8% 
  8. Connect the component:B9 Ambient Air Temperature Sensor
  9. Operate the vehicle within the Conditions for Running the DTC.
  10. Verify the DTC does not set.
    • If the DTC sets

      Replace the component:B9 Ambient Air Temperature Sensor

    • Go to next step: If the DTC is not set
  11. All OK.
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