The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the front tweeters using the audio signal circuits.
TWEETER (SEDAN)
Diagnosis Procedure
1.HARNESS CHECK
Disconnect BOSE speaker amp. connector B122 and suspect tweeter connector.
Check continuity between BOSE speaker amp. harness connector B122 (A) and suspect tweeter harness connector (B).
Check continuity between BOSE speaker amp. harness connector B122 (A) and ground.
Are continuity test results as specified?
YES >> GO TO 2
NO >>
Check connector housings for disconnected or loose terminals.
Repair harness or connector. 2.TWEETER SIGNAL CHECK
Connect BOSE speaker amp. connector B122 and suspect tweeter connector.
Turn ignition switch to ACC.
Push "POWER" switch.
Check the signal between BOSE speaker amp. harness connector B122 terminals with CONSULT-III or oscilloscope.