Bose Audio Without Navigation

CENTER SPEAKER

Description

The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the center speaker using the audio signal circuits.


Diagnosis Procedure

Regarding Wiring Diagram information, Bose Audio or Sedan.

1. CONNECTOR CHECK

Check the audio unit and speaker connectors for the following:
- Proper connection
- Damage
- Disconnected or loose terminals
Is the inspection result normal?
YES- GO TO 2
NO- Repair the terminal and connector.

2. HARNESS CHECK






1.Disconnect BOSE speaker amp. connector B121 and center speaker connector M151.
2.Check continuity between BOSE speaker amp. harness connector B121 (A) and center speaker harness connector M151 (B).





3.Check continuity between BOSE speaker amp. harness connector B121 (A) and ground.





Are continuity test results as specified?
YES- GO TO 3
NO- Repair harness or connector.

3. CENTER SPEAKER SIGNAL CHECK






1.Connect BOSE speaker amp. connector B121 and center speaker connector.
2.Turn ignition switch to ACC.
3.Push audio unit "POWER" switch.
4.Check the signal between BOSE speaker amp. harness connector B121 terminals with CONSULT or oscilloscope.





Is the audio signal voltage reading as specified?
YES- Replace center speaker. Bose Audio Without Navigation.
NO- GO TO 4

4. HARNESS CHECK

1.Disconnect audio unit connector M46 (Sedan) or M134 (Coupe) and BOSE speaker amp. connector
B121.
2.Check continuity between audio unit harness connector M46 (Sedan) or M134 (Coupe) and BOSE speaker amp. harness connector B121.





3.Check continuity between audio unit harness connector M46 (Sedan) or M134 (Coupe) and ground.





Are continuity test results as specified?

YES- GO TO 5
NO- Repair harness or connector.

5. CENTER SPEAKER SIGNAL CHECK

1.Connect audio unit connector and BOSE speaker amp. connector.
2.Turn ignition switch ACC.
3.Push audio unit "POWER" switch.
4.Check the signal between audio unit harness connector M46 (Sedan) or M134 (Coupe) terminals with
CONSULT or oscilloscope.





Are the audio signal voltage readings as specified?
YES- Replace BOSE speaker amp. Coupe Bose Audio Without Navigation or Sedan Bose Audio Without Navigation.
NO- Replace audio unit. Bose Audio Without Navigation.