Q2 CHECK FOR AN AC (ALTERNATING CURRENT) VOLTAGE SIGNAL ON THE APIM (SYNC MODULE) STEREO OUTPUT CIRCUITS TO THE ACM (AUDIO FRONT CONTROL MODULE)
NOTICE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool POM6411. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage, while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors, and may cause subsequent electrical faults.
Play an audio file through the audio system using a SYNC® audio source (Bluetooth, USB ports, RCA jacks). While back-probing ACM C240B, measure the AC voltage.
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C240B-12 | C240B-25 | |
C240B-13 | C240B-26 |
Is a fluctuating AC voltage present?
Yes | GO to Q8 |
|---|---|
No | GO to Q3 |
Q3 CHECK THE APIM (SYNC MODULE) STEREO OUTPUT CIRCUITS TO THE ACM (AUDIO FRONT CONTROL MODULE) FOR A SHORT TO VOLTAGE
Ignition OFF. Disconnect: ACM C240B. Disconnect: APIM C2383. Ignition ON. Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C240B-12 | Ground | |
C240B-13 | Ground | |
C240B-25 | Ground | |
C240B-26 | Ground |
Is any voltage present?
Yes | REPAIR the circuit in question. |
|---|---|
No | GO to Q4 |
Q4 CHECK THE APIM (SYNC MODULE) STEREO OUTPUT CIRCUITS TO THE ACM (AUDIO FRONT CONTROL MODULE) FOR A SHORT TO GROUND
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.