Circuit/System Testing

Ignition/Vehicle Off and all vehicle systems Off, disconnect the harness connector at the P50 Emergency/Call Backup Speaker. Ignition ON/Vehicle in Service Mode.
Test for 5 - 7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
- If less than 5 V
1. Ignition OFF, disconnect the harness connector X1 and X2 at the K73 Telematics Communication Interface Control Module.
2. Test for infinite resistance between the signal circuits and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K73 Telematics Communication Interface Control Module.
- If greater than 7 V
1. Ignition OFF, disconnect the harness connector X1 and X2 at the K73 Telematics Communication Interface Control Module. Ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K73 Telematics Communication Interface Control Module.
- Go to next step: If between 5 - 7 V
Test or replace the P50 Emergency/Call Backup Speaker.