Test E: The Subwoofer Is Inoperative/Does Not Operate Correctly - Audiophile
PINPOINT TEST E: THE SUBWOOFER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - AUDIOPHILEE1-E2:
E3-E5:
E6-E8:
E8-E10:
Normal Operation
The subwoofer amplifier receives voltage through circuit SBP38 (BN/RD) and ground through circuit GD148 (BK/YE). The subwoofer speakers and subwoofer amplifier are integral to the enclosure and cannot be repaired individually.
To enable the subwoofer amplifier, the audio unit sends voltage through the enable/clip circuit SME23 (VT/RD). The circuit acts as both an output (to enable the amplifier) and an input (to detect an amplifier overload condition). A variable resistor in the subwoofer amplifier modifies the voltage signal from the audio unit. In the event of an overload, the audio unit clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and speakers.
The clip/enable status is based on the following voltages, as detected by the audio unit:
- Less than 0.4 volts: amplifier disabled
- Between 3.8 and 6.7 volts: amplifier enabled
- Greater than 8.5 volts: amplifier clipped
DTC B1154 - sets when a short to ground is detected on circuit RME22 (GN/WH) or circuit 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 circuit 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
- Circuitry
- Subwoofer
- Audio unit