LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2017 >> Spark LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 34 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Radio Controls Malfunction >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the A22 Radio Controls.
  2. Test for less than 10 Ω between the ground circuit terminal 8 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.
    • Go to next step: If less than 10 Ω 
  3. Test for less than 20 Ω between the data shield circuit terminal 7 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.
    • Go to next step: 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, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. 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, replace the A22 Radio Controls.
    • Go to next step: If the test lamp illuminates. 
  5. Ignition ON.
  6. Test for 2 - 3 V between the serial data circuit terminals listed below and ground.
    • terminal 5
    • terminal 6
    • If less than 2 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the affected serial data circuit(s) 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 serial 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 serial data 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.
    • Go to next step: If between 2 - 3 V 
  7. Test for less than 1 V between the control circuit terminals listed below and ground.
    • terminal 3
    • terminal 4
    • If greater than 1 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio. Ignition ON.
    2. Test for less than 1 V between the affected control circuit(s) and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A11 Radio.
    • Go to next step: If less than 1 V 
  8. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
  9. Test for infinite resistance between the control circuit terminals listed below and ground.
    • A22 Radio Controls terminal 3
    • A22 Radio Controls terminal 4
    • If less than infinite resistance, 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  10. Test for less than 2 Ω between the control circuits listed below.
    • A22 Radio Controls terminal 3 and the A11 Radio terminal 13 X1
    • A22 Radio Controls terminal 4 and the A11 Radio terminal 27 X1
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω. 
  11. Replace the A22 Radio Controls. Connect all harness connectors.
  12. Ignition ON, radio ON.
  13. Verify that all radio controls operate and perform the correct function.
    • If the radio controls still malfunction. 

      Replace the A11 Radio.

    • Go to next step: If all radio controls operate and perform the correct function. 
  14. All OK
scientia non olet · About LEMON Manuals