Test F: The Subwoofer Is Inoperative/Does Not Operate Correctly - Except THX(R)

PINPOINT TEST F: THE SUBWOOFER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - EXCEPT THX(R)

F1-F3:

F4-F6:

F6-F8:

F8-F10:

Normal Operation
The subwoofer speaker and amplifier are integral. The enable/clip circuit SME23 (VT/RD) carries out 2 functions: to turn the subwoofer on, and to monitor an overload condition to the subwoofer. In the event of an overload, the audio unit clips the audio output signal to the subwoofer (heard as distortion). The subwoofer receives voltage through circuit SBP38 (BN/RD), and ground through circuit GD114 (BK/BU).

DTC B1154 sets when a short to ground is detected on circuit RME22 (GN/WH) or VME22 (VT/GN). This DTC only sets during the on-demand self-test.

DTC B1155 - sets when a short to voltage is detected on circuit RME22 (GN/WH) or VME22 (VT/GN). This DTC only sets during the on-demand self-test.

DTC B2913 - sets when the audio unit does not detect the subwoofer through circuit SME23 (VT/RD) during the subwoofer connection test (part of the audio unit self-test).

Possible Causes
- Fuse
- Circuit GD114 (BK/BU) open
- Circuit RME22 (GN/WH) open, short to ground or voltage
- Circuit SBP38 (BN/RD) open
- Circuit SME23 (VT/RD) open, short to ground or voltage
- Circuit VME22 (VT/GN) open, short to ground or voltage
- Subwoofer
- Audio unit