Circuit/System Testing

With Amplifier

1. Disconnect the suspect audio amplifier harness connector.
2. Disconnect the radio harness connector.
3. Test for less than 1 volt on both of the suspect low level audio signal circuits.
   • If greater than 1 volt repair short to voltage.
4. Test for infinite resistance between both low level audio signal circuits and ground.
   • If less than specified value, repair short to ground.
5. Test for less than 1 ohm between the suspect low level audio signal circuits amplifier harness connector and the suspect speaker harness connector.
   • If greater than specified value repair open or high resistance.
   • If all circuits test normal, replace the amplifier.

Without Amplifier

1. Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the suspect speaker terminals.
   • If not within the specified range specified range replace the suspect speaker.
2. Disconnect the suspect radio harness connector.
3. Test for less than 1 volt on both of the low level audio signal circuits.
   • If greater than 1 volt repair short to voltage.
4. Test for infinite resistance between both of the suspect low level audio signal circuits and ground.
   • If resistance is less than specified value, repair short to ground.
5. Test for less than 1 ohm between the suspect speaker harness connector both low level audio signal circuits and the suspect radio harness connector.
   • If greater than specified value repair open or high resistance.
   • If all circuits test normal, replace the radio.