Test D: The Subwoofer Is Inoperative

PINPOINT TEST D: THE SUBWOOFER IS INOPERATIVE

Test D1-D3:

Test D4-D6:

Test D6-D7:

Normal Operation
The subwoofer speakers are powered from a separate subwoofer amplifier. The enable input circuit 173 (DG/VT) powers up the subwoofer amplifier. The audio unit sends an output signal to the subwoofer amplifier on circuit 167 (BN/OG) and 168 (RD/BK).

Possible Causes
- circuit 167 (BN/OG) open or short to ground
- circuit 168 (RD/BK) open or short to ground
- circuit 173 (DG/VT) open or short to ground
- circuit 1204 (BK/OG) open
- circuit 828 (VT/LB) open or short to ground
- subwoofer amplifier
- subwoofer
- audio unit