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

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

Normal Operation
The subwoofer speakers are powered by a separate subwoofer amplifier. The subwoofer amplifier receives voltage through circuit CBP06 (WH/BU), and ground through circuit GD148 (BK/YE).

To enable the subwoofer amplifier, the audio control module (ACM) 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 ACM. In the event of an overload, the ACM clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and the subwoofer speaker.

The clip/enable status is based on the following voltages, as detected by the ACM:
- Less then 0.4 volts: amplifier disabled
- Between 3.8 and 6.7 volts: amplifier enabled
- Greater than 8.5 volts: amplifier clipped

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Subwoofer speaker
- Subwoofer amplifier
- ACM

E1-E2:

E3-E5:

E5-E7:

E7-E9:

E9-E11:

E12: