Normal Operation and Fault Conditions
REFER to: Information and Entertainment System (415-00B) . See Network Message Chart, Chimes, ACM, and Audio DSP Module.
If the audio DSP module detects an open, short to ground, or less than 3.5 volts on the enable circuit, the speaker output will be muted for all of the speakers.
A short to ground or short to voltage in the circuitry to one of the speakers may cause multiple speakers to lose sound due to the built-in overload protection feature of the audio DSP module. In this case, a speaker fault DTC sets.
DTC Fault Trigger Conditions
Description | Fault Trigger Conditions | DTC Type | |||
|---|---|---|---|---|---|
DTC | |||||
B1142:27 | Ignition Status 1: Signal Rate of Change Above Threshold | Set by the ACM when a short to voltage is detected on the start signal circuit. | Continuous | ||
B13FB:11 Audio Enable Line: Circuit Short To Ground | Set by the audio DSP module when a short to ground is detected on the enable circuit. | Continuous | |||
Possible Sources
Wiring, terminals, or connectors Fuse ACM Audio DSP module
PINPOINT TEST G : NO SOUND FROM ALL SPEAKERS
G1 VERIFY THAT THE ACM (AUDIO FRONT CONTROL MODULE) AND AUDIO DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) MODULE PASS THE NETWORK TEST
Using a diagnostic scan tool, perform the network test.
Did the ACM and audio DSP module pass the network test?
Yes | GO to G2 |
|---|---|
No | • If the ACM failed the network test, REFER to: Communications Network (418-00) . See The ACM Does Not Respond To The Diagnostic Scan Tool. • If the audio DSP module failed the network test, REFER to: Communications Network (418-00) . See The Audio DSP Module Does Not Respond To The Diagnostic Scan Tool. |
G2 CHECK FOR SPEAKER DIAGNOSTIC TROUBLE CODES (DTCS)
Using a diagnostic scan tool, perform the audio DSP module self-test.
Are any speaker fault Diagnostic Trouble Codes (DTCs) present?
Yes
REFER to: Information and Entertainment System (415-00B) .
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.