Test I: No International Standards Organization (ISO) 9141 Communications Network Communication
PINPOINT TEST I: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 COMMUNICATIONS NETWORK COMMUNICATIONI1-I4:
I5-I8:
I9-I12:
I12-I15:
Normal Operation
The restraint control module (RCM), parking aid module and the four-wheel drive (4WD) control module both communicate with the diagnostic tool through the ISO 9141 communications network, circuit 70 (LB/WH). Check circuit 70 (LB/WH) between both modules and the data link connector (DLC) C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in the ISO 9141 communications network circuit, damage to the DLC C251, damage to one of the module connectors, or a problem in an in-line connector.
Possible Causes
- ISO 9141 communications network circuit 70 (LB/WH) open, short to ground, or short to voltage.
- DLC C251
- RCM C2041
- RCM
- parking aid module C4014
- parking aid module
- 4WD control module C281b
- 4WD control module