Pinpoint Test G : No Sound From All Speakers: Notes

Diagnostic Overview 

Refer to Audio System/Navigation for schematic and connector information.

Normal Operation and Fault Conditions 

When the key is in START, the ACM receives voltage on the START signal circuit. The ACM then mutes the speaker output to prevent voltage spikes from producing a popping noise through the speakers. However, a short to voltage on this circuit causes the ACM output to be continuously muted.

The audio DSP module is enabled through software. Additionally, the ACM can mute the audio DSP module through the mute/unmute circuit. If the audio DSP module detects less than 3.5 volts on the mute/unmute circuit, it mutes the speaker output. As a result, an open or short to ground in the mute/unmute circuit causes the audio system to produce no sound, because the enable signal does not reach the audio DSP module. In the event of an overload, the audio DSP module clips the audio output signal to the speakers and subwoofer (heard as distortion) in order to prevent damage to the speakers. If a speaker circuit fault DTC is present, Refer to DTC chart .