Possible Sources

DTC Description Fault Trigger Conditions B12B8:04 USB Port #2: Set by the APIM when a failure is detected on the rear USB port (USB2) System Internal internal APIM circuitry. Failure B12B8:11 USB Port #2: Circuit Set by the APIM when a short to ground or over-current (overloaded) condition Short To Ground is detected on the rear USB port/cable (USB2). This can be caused by a fault in the USB port/cable or customer's USB device.

Original table alignment retained · Scroll horizontally if needed

Customer's device Rear USB port/cable USB port/cable connection APIM

PINPOINT TEST V : THE REAR USB (UNIVERSAL SERIAL BUS) PORT (USB2) IS INOPERATIVE OR

DOES NOT OPERATE CORRECTLY

V1 CHECK THE REAR USB (UNIVERSAL SERIAL BUS) PORT FOR POWER OUTPUT

Ignition ON. Connect: MIT 105-00120 to the rear USB port.

Does the MIT 105-00120 power on from the rear USB port?

Yes	GO to V2
No	GO to V3

V2 RESET THE APIM (SYNC MODULE) AND RECHECK SYNC® SYSTEM OPERATION

Remove any devices connected to the USB ports and audio input jack. Carry out an APIM power reset by disconnecting the battery for 1 minute, then reconnecting it. Ignition ON. Wait at least 2 minutes for the APIM to re-initialize. Connect: MIT 105-00120 to the rear USB port. Select USB mode on the MIT. Operate the audio system in USB mode and observe the audio output.

Is the audio system USB output OK with the MIT 105-00120 connected to the rear USB port?

Yes	The system is operating correctly at this time. The concern was corrected by performing the APIM power reset. If the customer's device still does not operate correctly, the fault is with the customer's device.
No	GO to V3

V3 CHECK THE APIM (SYNC MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) B12B8:04 OR DTC (DIAGNOSTIC TROUBLE CODE) B12B8:11

Using a diagnostic scan tool, clear the APIM Diagnostic Trouble Codes (DTCs). Perform the APIM self-test.

Is DTC B12B8:04 or DTC B12B8:11 present?

Yes	GO to V4

Source reference 4190

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.