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Home >> Chevrolet >> 2021 >> Traverse LS, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Cellular, Entertainment, And Navigation System) >> Diagnostic Information and Procedures >> Infotainment Control Switch Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle OFF, disconnect the harness connector at the S165 Infotainment Control Switch.
  2. Verify a test lamp illuminates between the ground circuit terminal 5 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance in the ground circuit or ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON/Vehicle In Service Mode.
  4. Verify a test lamp illuminates between the B+ circuit terminal 10 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test for an open/high resistance in the B+ circuit.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    2. 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. Test for a short to ground in the B+ circuit.
      • If a short to ground is found, repair the fault in the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the S165 Infotainment Control Switch.
    • Go to next step: If the test lamp illuminates 
  5. Test for less than 4.5 V between each of the infotainment CAN bus serial data circuit terminals listed below and ground.
    • Terminal 1
    • Terminal 6
    • If 4.5 V or greater 
    1. Ignition/Vehicle OFF, disconnect the harness connectors at the A11 Radio.
    2. Ignition ON/Vehicle in Service Mode.
    3. Test for less than 1 V between the infotainment CAN bus serial data circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage in the serial data circuit.
      • If less than 1 V, replace the A11 Radio.
    • Go to next step: If less than 4.5 V 
  6. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
  7. Test for greater than 100 Ω between each of the infotainment CAN bus serial data circuit terminals listed below and ground.
    • Terminal 1
    • Terminal 6
    • If 100 Ω or less 
    1. Disconnect the harness connectors at the A11 Radio.
    2. Test for infinite resistance between the infotainment CAN bus serial data circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground in the serial data circuit.
      • If infinite resistance, replace the A11 Radio.
    • Go to next step: If greater than 100 Ω 
  8. Test for 110 - 130 Ω between the infotainment CAN bus serial data circuit terminals 1 and 6.
    • If less than 110 Ω 
    1. Disconnect the harness connectors at the A11 Radio.
    2. Test for infinite resistance between the pair of the infotainment CAN bus serial data circuit terminals.
      • If less than infinite resistance, repair the short together between the serial data circuits.
      • If infinite resistance, replace the A11 Radio.
    • If greater than 130 Ω 
    1. Disconnect the harness connectors at the A11 Radio.
    2. Test for less than 2 Ω in each of the infotainment CAN bus serial data circuits end to end between the S165 Infotainment Control Switch and the A11 Radio.
      • S165 Infotainment Control Switch terminal 1 and A11 Radio terminal 16 X2
      • S165 Infotainment Control Switch terminal 6 and A11 Radio terminal 17 X2
      • If 2 Ω or greater, repair the open/high resistance in the serial data circuit.
      • If less than 2 Ω, replace the A11 Radio.
    • Go to next step: If between 110 - 130 Ω 
  9. Replace the S165 Infotainment Control Switch.
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