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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> DTC B110A >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S27 Head-Up Display Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P29 Head-Up Display.
    • Go to next step: If less than 10 Ω 
  3. Test for 4.8 - 5.2 V between the signal circuit terminal 4 and ground.
    • If less than 4.8 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P29 Head-Up Display.
    • If greater than 5.2 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P29 Head-Up Display.
    • Go to next step: If between 4.8 - 5.2 V 
  4. Test for 3.7K - 3.9K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side).
    • If not between 3.7K - 3.9K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 3.7K - 3.9K Ω 
  5. Test for 1K - 1.2K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the HUD DOWN Switch pressed.
    • If not between 1K - 1.2K Ω 

      Replace the S27 Head-Up Display switch.

    • Go to next step: If between 1K - 1.2K Ω 
  6. Test for 0.55K - 0.75K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the HUD UP Switch pressed.
    • If not between 0.55K - 0.75K Ω 

      Replace the S27 Head-Up Display switch.

    • Go to next step: If between 0.55K - 0.75K Ω 
  7. Test for 1.8K - 2.0K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the INFO/PAGE Switch pressed.
    • If not between 1.8K - 2.0K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 1.8K - 2.0K Ω 
  8. Test for 95 - 115 Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the Brightness + Switch pressed.
    • If not between 1.3K - 1.6K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 1.3K - 1.6K Ω 
  9. Test for 310 - 350 Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the Brightness - Switch pressed.
    • If not between 310 - 350 Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 310 - 350 Ω 
  10. Replace the P29 Head-Up Display.
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