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Home >> Buick >> 2016 >> Cascada Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Radio Information Display Malfunction (with Monochrome Display) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the P17 info display module.
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater. 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω. 
  3. Test for less than 20 Ω between the data shield circuit terminal 6 and ground.
    • If 20 Ω or greater. 
    1. Ignition OFF, disconnect the X1 connector at the A11 radio.
    2. Test for less than 2 Ω in the data shield 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 less than 20 Ω. 
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good. 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open. 
    1. Ignition OFF.
    2. Disconnect the harness connector at the A22 radio controls.
    3. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    4. Connect the harness connector at the A22 radio controls.
    5. Test for greater than 10 Ω between the B+ circuit and ground.
      • If less than 10 Ω, replace the A22 radio controls.
      • If 10 Ω or greater, replace the P17 info display module.
    • If the test lamp illuminates. 
  5. Ignition ON, test for 2-3 V between the data circuit terminals listed below and ground.
    • terminal 7
    • terminal 8
    • If less than 2 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 radio.
    2. Test for infinite resistance between the data circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the data 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 3 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 radio. 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 A11 radio.
    • If between 2-3 V 
  6. Ignition OFF, connect the harness connector at the P17 info display module. Disconnect the X1 harness connector at the A11 radio.
  7. Ignition ON, test for 4.5-5.5 V between the signal circuit terminals listed below and ground.
    • terminal 27
    • terminal 13
    • If less than 4.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the P17 info display module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • 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 P17 info display module.
    • If greater than 5.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the P17 info display module. 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 P17 info display module.
    • If between 4.5-5.5 V 
  8. Replace the P17 information display module.
  9. Connect all harness connectors. Ignition ON, radio ON.
  10. Verify the P17 info display module turns on and information is shown on the display.
    • If the information display still malfunctions. 

      Replace the A11 radio.

    • If the info display module turns on and information is shown on the display. 
  11. All OK
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