Test L

PINPOINT TEST L: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 NETWORK COMMUNICATION

Test L1:

Test L2-L5:

Test L6-L9:

Test L9-L12:

Normal Operation
The parking aid module and the restraint control module (RCM) communicate with the diagnostic tool through the ISO 9141 communications network circuit 70 (LB/WH). The ABS module is also on the ISO network, but does not utilize this network for communication with the diagnostic tool. If circuit 70 (LB/WH) becomes open or shorted to ground, communications to that module will not be possible. Check circuit 70 (LB/WH) between the parking aid module, RCM, ABS module, and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuit 70 (LB/WH), damage to the DLC C251, damage to the parking aid module, RCM, ABS module, or a problem in one of the in-line connectors. If, after individual checks of each circuit leading to a module show resistance values less than 5 ohms and no in-line connector issues present, the data link diagnostics test must be run with the module in question disconnected. If the data links diagnostics test passes with the module in question disconnected it is the source of the concern and should be removed and a new module installed.

Possible Causes
- circuit 70 (LB/WH) shorted to ground or open
- DLC C251
- RCM
- Anti-lock brake system (ABS) module
- parking aid module (if equipped)