Tribute 2WD V6-3.0L (2008)
Step 1-Step 3
Pinpoint Test 4: The Subwoofer Is Inoperative/Does Not Operate Correctly
PINPOINT TEST 4: THE SUBWOOFER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
Normal Operation
The subwoofer amplifier receives voltage through circuit (BR/R) and ground through circuit (B/G). The sub-woofer speaker and subwoofer amplifier are
integral to the enclosure and cannot be replaced individually; however, the subwoofer speaker is only replaceable as an assembly with the enclosure and
subwoofer amplifier.
To enable the subwoofer amplifier, the audio unit sends voltage through the enable/clip circuit (V/R). 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:
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Less than 0.4 volts: amplifier disabled
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Between 3.8 and 6.7 volts: amplifier enabled
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Greater than 8.5 volts: amplifier clipped
An open in circuit (V/R) will cause the subwoofer to produce no sound, because the enable signal will not reach the subwoofer amplifier. A short to
ground or short to voltage can cause severe distortion to be heard in the subwoofer.
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DTC B1155 (Subwoofer #1 Short to Battery) - sets when a short to voltage is detected on circuit (V/R). This DTC only sets during the on-demand
self-test.
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DTC B1158 (Subwoofer #2 Open) - sets when a open is detected on circuit (V/R). This DTC only sets during the on-demand self-test.
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DTC B2913 (Audio Subwoofer Not Connected) - sets when the audio unit does not detect the subwoofer through circuit (V/R) during the
subwoofer connection test (part of the audio unit self-test).
Possible Causes
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Fuse
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Wiring, terminals or connectors
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Subwoofer
