Sound Is Not Heard From Subwoofer (BOSE System)

Check that the following fuse is not blown.

OK or NG 

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

1. Disconnect subwoofer connector.
2. Check voltage between the subwoofer and ground.
   TERMINAL SPECIFICATION
   
   

   Unit	Terminal No.			OFF	ACC	ON
   	(+)		(-)
   	Connector	Terminal
   Subwoofer	B72	6	Ground	Battery voltage	Battery voltage	Battery voltage

   Fig 1: Checking Voltage Between Subwoofer Connector Terminal 6 And Ground

   

OK or NG 

OK: GO TO 3.

NG:

• Check connector housings for disconnected or loose terminals.
• Repair harness or connector.

Check continuity between subwoofer harness connector B72 terminal 5 and ground.

Continuity should exist. 

OK or NG 

OK: GO TO 4.

NG:

• Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
  Fig 2: Checking Continuity Between Subwoofer Connector Terminal 5 And Ground

  

1. Disconnect BOSE speaker amp. connectors B74 and B75 and subwoofer connector B72.
2. Check continuity between BOSE speaker amp. and subwoofer.
   CONTINUITY CHART
   
   

   A		B		Continuity
   Connector	Terminal	Connector	Terminal
   BOSE speaker amp.: B75	22	Subwoofer: B72	4	Yes

   Fig 3: Checking Continuity Between Bose Speaker Amp And Subwoofer

   
   CONTINUITY CHART
   
   

   C		B		Continuity
   Connector	Terminal	Connector	Terminal
   BOSE speaker amp.: B74	3	Subwoofer: B72	1	Yes
   	19		2

3. Check continuity between BOSE speaker amp. and ground.
   CONTINUITY CHART
   
   

   A		Ground	Continuity
   Connector	Terminal
   BOSE speaker amp.: B75	22		No

   CONTINUITY CHART
   
   

   C		Ground	Continuity
   Connector	Terminal
   BOSE speaker amp.: B74	3		No
   	19

OK or NG 

OK: GO TO 5.

NG:

• Check connector housings for disconnected or loose terminals.
• Repair harness or connector.

1. Operate system and check voltage between subwoofer harness connector B72 terminal 4 and ground.

   Voltage : More than approx. 6.5V 

   OK or NG 

   OK: GO TO 6.

   NG: Replace BOSE speaker amp. Refer to "BOSE SPEAKER AMP. ".

   Fig 4: Checking Voltage Between Subwoofer Connector B72 Terminal 4 And Ground

   

1. Connect BOSE speaker amp. connector and subwoofer connector.
2. Turn ignition switch to ACC.
3. Check the signal between BOSE speaker amp. terminals with CONSULT-II or oscilloscope.

A				Condition	Reference signal
(+)		(-)
Connector	Terminal	Connector	Terminal
BOSE speaker amp.: B74	19	BOSE speaker amp.: B74	3	Receive audio signal

Fig 5: Checking Signal Between Bose Speaker Amp Terminals