Pinpoint Test I: No Sound From All Speakers
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- I1 CHECK THE AUDIO UNIT
- Key in OFF position.
- Disconnect: Audio Unit C229e.
- Key in ON position.
- Measure the voltage between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground.
- Is any voltage present?
Yes : GO to I2.
No : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair.
- I2 CHECK CIRCUIT 1786 (BN/PK) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280a.
- Measure the voltage between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground.
- Is any voltage present?
Yes : REPAIR the circuit. TEST the system for normal operation.
No : GO to I3.
- I3 CHECK FOR CORRECT SJB OPERATION
- Key in OFF position.
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.