Test E: The Subwoofer Is Inoperative/Does Not Operate Correctly

PINPOINT TEST E: THE SUBWOOFER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

E1-E3:

E3-E5:

E5-E7:

E7-E8:

Normal Operation
The subwoofer amplifier receives voltage through circuit 720 (RD/YE) and ground through circuit 694 (BK/LG). Audio signals are sent to the subwoofer amplifier from the audio unit through circuits 167 (BN/OG) and 168 (RD/BK). The enable/clip circuit 173 (DG/VT) carries out 2 functions: to turn the subwoofer amplifier on, and to monitor an overload condition to the subwoofer amplifier. In the event of an overload, the audio unit clips the audio output signal to the subwoofer amplifier (heard as distortion).

Possible Causes
- Fuse
- Circuit 167 (BN/OG) open, short to ground or voltage
- Circuit 168 (RD/BK) open, short to ground or voltage
- Circuit 173 (DG/VT) open, short to ground or voltage
- Circuit 694 (BK/LG) open
- Circuit 720 (RD/YE) open
- Subwoofer amplifier
- Audio unit