Circuit/System Testing

Microphone

1. Ignition OFF, disconnect the harness connector at the B24 Cellular Phone Microphone and disconnect the X2 harness connector at the A11 Radio, ignition ON.
2. Test for less than 1 V between each B24 Cellular Phone Microphone harness connector terminal listed below and ground:
   • Signal circuit terminal 1
   • Signal circuit terminal 2
   • 5 V circuit terminal 4
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
3. Test for infinite resistance between each B24 Cellular Phone Microphone harness connector terminal listed below and ground:
   • Signal circuit terminal 1
   • Signal circuit terminal 2
   • 5 V circuit terminal 4
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • Go to next step: If infinite resistance 
4. Test for less than 2 Ω between each harness connector terminal listed below end to end.
   • B24 Cellular Phone Microphone - terminal 1 and A11 Radio terminal 14 X2
   • B24 Cellular Phone Microphone - terminal 2 and A11 Radio terminal 16 X2
   • B24 Cellular Phone Microphone - terminal 4 and A11 Radio terminal 15 X2
   • If 5 Ω or greater 

     Repair the open/high resistance in the circuit.

   • Go to next step: If less than 5 Ω 
5. Replace the B24 Cellular Phone Microphone. Connect all harness connectors.
6. Place a call using the cellular device paired to the system.
7. Verify the conversation partner can hear you clearly.
   • If the conversation partner cannot hear you clearly 

     Replace the A11 Radio.

   • Go to next step: If the conversation partner can hear you clearly 
8. All OK.