Special Service Tool
The actual shapes of the tools may differ from those illustrated here.

Commercial Service Tool

Precaution
System descriptionTweeter
   	Description
The AV control unit sends audio signals to the BOSE speaker amp. The BOSE 
speaker amp. amplifies the 
audio signals before sending them to the tweeters using the audio signal 
circuits.
Diagnosis Procedure
1.CONNECTOR CHECK
Check the AV control unit, BOSE speaker amp. and speaker ...
   	
Key slot
   	Diagnosis Procedure
Regarding Wiring Diagram information, refer to SEC-147, 
"Wiring Diagram" or SEC-128, "Wiring Diagram".
1.CHECK KEY SLOT POWER SUPPLY CIRCUIT
	
	 Turn ignition switch OFF.
	
	
	 Disconnect key slot connector.
	
	
	 Check voltage between slot harness co ...
   	
Steering switch
   	Description
When one of the steering wheel audio control switches is pushed, the 
resistance in the steering wheel audio 
control switch circuit changes, depending on which button is pushed.
Diagnosis Procedure
1.CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE
	Turn ignition switch  ...