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Home >> Buick >> 2020 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Radio Information Display Malfunction (IOB) >> Circuit/System Testing >> Touch Screen

Touch Screen

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF/vehicle OFF and all vehicle systems OFF, disconnect the X1 harness connector at the P17 Info Display Module. It may take up to 2 min for all vehicle systems to power down.
  2. Ignition ON/vehicle in Service Mode.
  3. Test for 1.5 - 2 V between the signal circuit terminal 7 and ground.
    • If less than 1.5 V 
    1. Ignition OFF/vehicle OFF, disconnect the X2 harness connector at the A11 radio.
    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 on 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 A11 Radio.
    • If greater than 2 V 
    1. Ignition OFF/vehicle OFF, disconnect the X2 harness connector at the A11 Radio.
    2. Test for less than 1 V between the signal circuit and ground.
      • If greater than 1 V repair the short to voltage in the circuit.
      • If less than 1 V replace the A11 Radio.
    • Go to next step: If between 1.5 - 2 V 
  4. Replace the P17 Info Display Module
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