72679 - N11 THE RADIO CANNOT BE HEARD, IS HARD TO HEAR

The radio is integrated in the Connect which, is connected to the standard or Bose type amplifier for acoustic functions.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the problem is not only related to the radio function	Move on to Step	1. No sound can be heard in all the audio functions	Move on to Step
			2. Only some of the speakers are not working	Move on to Step
			3. There is interference with the sound	Move on to Step
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the Connect NodeIn errors ambient that there are no faults in active diagnosis ambient the operation of the speakers	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. None of the speakers are working but there are no faults	Move on to Step
2	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for a positive power supply for the amplifier for an earth for the amplifier. for an enablement positive from the Connect Node for the amplifier in the luggage compartment (Wiring Diagram ) E3510 RADIO	Move on to Step	1. No positive supply	Move on to Step
			2. No earth	Move on to Step
			3. No enablement positive from Connect Node	Move on to Step
3	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the supply fuse at the luggage compartment junction unit the electrical connections inside the luggage compartment junction unit the electrical connection between the luggage compartment junction unit and the amplifier the electrical connection between the amplifier and the earth (Wiring Diagram ) E3510 RADIO	Move on to Step	1. Fuse blown	1. Replace the supply fuse (Wiring Diagram ) E3510 RADIO
			2. Connections inside the luggage compartment junction unit broken	2. Replace the luggage compartment junction unit
			3. The electrical connection between the luggage compartment junction unit and the amplifier is faulty	3. Restore the electrical connection (Wiring Diagram ) E3510 RADIO
			4. Earth connection faulty	4. Restore the electrical connection (Wiring Diagram ) E3510 RADIO
4	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity/insulation of the electrical connection between the Connect Node and the amplifier (Wiring Diagram ) E3510 RADIO	Move on to Step	Electrical connection between Connect and amplifier faulty	Restore the electrical connection (Wiring Diagram ) E3510 RADIO
5	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the Connect NodeIn errors ambient that there are no faults in active diagnosis ambient the operation of the speakers	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. Some of the speakers are not working	Move on to Step
6	ELECTRICAL SYSTEM/COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Identify the speaker that is not working, remove it from its housing and check the following the resistance of the coil winding Also check the continuity/insulation between the speaker and the amplifier (Wiring Diagram ) E3510 RADIO	Move on to Step	1. Speaker short circuited or broken	1. Replace the speaker
			2. Electrical connection between amplifier and speaker faulty	2. Restore the electrical connection (Wiring Diagram ) E3510 RADIO
7	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the Connect NodeIn errors ambient that there are no faults in active diagnosis ambient the operation of the speakers	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. There is interference with the sound from some of the speakers	Move on to Step
8	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the faulty speaker and check the resistance of the coil winding the condition of the diaphragm	Move on to Step	Speaker faulty	Replace the speaker
9	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the amplifier    See in Op. 5570T36 Amplifier for speaker system - R.R.
10	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the Connect unit    See in Op. 5580P20 CONNECT CONTROL UNIT - R.R.