Test D: The Subwoofer Is Inoperative

PINPOINT TEST D: THE SUBWOOFER IS INOPERATIVE

D1:

D1-D3:

D3-D5:

D6-D9:

D9-D11:

D11 Continued:

Normal Operation
The subwoofer amplifier receives voltage through circuit 30-MD19 (RD), and ground through circuit 91-MD19 (BK/BU). Audio signals are sent to the subwoofer amplifier from the audio unit through circuits 1-MD23 (WH/BK) and 2-MD23 (GY/BK). The audio unit also sends a subwoofer enable signal to the subwoofer amplifier through circuit 8-MD19 (WH/RD).

Possible Causes
- Fuse
- Circuit 1-MD23 (WH/BK) open, short to ground or voltage
- Circuit 2-MD23 (GY/BK) open, short to ground or voltage
- Circuit 8-MD19 (WH/RD) open or short to ground
- Circuit 30-MD19 (RD) open
- Circuit 91-MD19 (BK/BU) open
- Subwoofer speaker circuitry
- Subwoofer speaker
- Subwoofer amplifier
- Audio unit.