International Standards Organization (ISO) 9141 Communications Network
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The ISO 9141 communications network is a single wire network. The ISO 9141 communications network does not permit intermodule communication. The ISO 9141 is for the restraints control module (RCM) and is for diagnostic use only. When the scan tool communicates to the RCM, the scan tool must request all information; the module cannot initiate communications.
The following fault chart describes the specific ISO 9141 network failures and their resulting symptom:
ISO 9141 NETWORK COMMUNICATION FAULT CHART
| Failure Description | Symptom |
|---|---|
| ISO circuit open | No communication |
| ISO circuit short to voltage | No communication |
| ISO circuit short to ground | No communication |
| Module loss of voltage or ground | No communication |
| Module internal failure | No communication |