Test S: The SYNC System Is Completely Inoperative

PINPOINT TEST S: THE SYNC SYSTEM IS COMPLETELY INOPERATIVE

Normal Operation
The accessory protocol interface module (APIM) receives voltage at all times from circuit SBP13 (GY/RD), and ground through circuit GD114 (BK/BU). The wake-up signal is sent to the APIM by the audio control module (ACM) via the medium speed controller area network (MS-CAN).

- DTC U0184 (Lost Communication With Radio [ACM]) - set by the APIM when it is missing messages from the ACM over the MS-CAN for greater than 5 seconds.
- DTC U0196 (Lost Communication With Entertainment Control Module - Rear [AUX]) - set by the APIM when it is missing messages from the rear entertainment module (RETM) over the MS-CAN for greater than 5 seconds.
- DTC U0197 (Lost Communication With Telephone Control Module) - set by the ACM when it is missing messages from the APIM over the MS-CAN for greater than 5 seconds.

This pinpoint test is intended to diagnose the following:
- Audio system concern
- Communication network concern
- Customer error
- Customer device
- APIM
- ACM

S1-S3: