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Home >> GMC >> 2017 >> Terrain SL, Gas/Ethanol >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> Video Entertainment System Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate DVD display.
  2. Test for less than 10 Ω between the ground circuit terminals listed below and ground.
    • Ground terminal 8
    • Ground terminal 14
    • 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. Verify 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 appropriate P22 seatback video display.
    • If the test lamp illuminates 
  4. Verify a test lamp does NOT illuminate between the control circuit terminal 2 and ground.
    • If the test lamp illuminates 
    1. Disconnect the X1 harness at the A11 radio.
    2. Verify a test lamp does not illuminate between the control circuit and ground.
      • If the test lamp illuminates, repair the short to voltage on the circuit.
      • If the test lamp does not illuminate, replace the A11 radio.
    • If the test lamp does not illuminate 
  5. Ignition ON, A11 radio ON.
  6. Verify a test lamp illuminates between the control circuit terminal 2 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF. Disconnect the X1 harness at the A11 radio.
    2. Test for less than 2 Ω in the control 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 the test lamp illuminates 
  7. Ignition ON, radio ON, DVD playing.
  8. Test for 190 - 210 HZ DC between the control circuit terminal 16 and ground.
    • If not between 190 - 210 HZ DC. 
    1. Ignition OFF, disconnect the X3 harness connector at the A11 radio.
    2. Ignition ON.
    3. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Ignition OFF.
    5. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    6. Test for less than 2 Ω in the control 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 between 190 - 210 HZ DC. 
  9. Test for 190 - 210 HZ DC between the control circuit terminal 15 and ground.
    • If not between 190 - 210 HZ DC. 
    1. Ignition OFF, disconnect the X3 harness connector at the A11 radio.
    2. Ignition ON.
    3. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Ignition OFF.
    5. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    6. Test for less than 2 Ω in the control 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 between 190 - 210 HZ DC. 
  10. Test for 1 - 3 V between the signal circuit terminals listed below and ground.
    • terminal 9
    • terminal 10
    • If less than 1 V 
    1. Ignition OFF, disconnect the X3 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.
      • 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 A11 radio.
    • If greater than 3 V 
    1. Ignition OFF, disconnect the X3 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 1 - 3 V 
  11. Test normal or replace the appropriate P22 seatback video display.
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