Circuit/System Testing

Without Navigation Radio

1. Ignition OFF, disconnect the harness connector at the B24 cellular telephone microphone.
2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
   • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.
3. Ignition ON, test for 9-11 V between the signal circuit terminal 3 and ground.
   • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K82 mobile telephone control module.
   • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.
4. If all circuits test normal, replace the B24 cellular telephone microphone.

With Navigation Radio

1. Ignition OFF, disconnect the X4 harness connector at the navigation radio and the harness connector at the B24 cellular telephone microphone.
2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
   • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.
3. Ignition ON, test for 9-11 V between the signal circuit terminal 3 and ground.
   • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K82 mobile telephone control module.
   • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.
4. If all circuits test normal, replace the B24 cellular telephone microphone.
   • If condition still exists, replace the navigation radio.