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Circuit/System Testing

NOTE:

Use the schematics to determine which MOST devices are connected to the A11 Radio's MOST control circuit. Use the connector end views to identify the MOST control circuit terminal for each of those MOST devices.

  1. Ignition OFF, disconnect the harness connectors at an easily accessible MOST device that shares the A11 Radio's MOST control circuit. Ignition ON.
  2. Verify that the DTC U2098 or DTC U0029 02 remains current.
    • If the DTCs become history 

      Replace the MOST device that was just disconnected.

    • Go to next step: If any of the DTCs remain current 
  3. With the prior devices disconnected, repeat steps 1 and 2 for each MOST device on the MOST control circuit except the A11 Radio.
  4. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the A11 Radio.
  5. Test for infinite resistance between the MOST control circuit terminal at the A11 Radio and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  6. Replace the A11 Radio.
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