Circuit Description
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. When the module detects one of the following conditions on the class 2 serial data circuit for approximately 3 seconds, the setting of all other class 2 serial communication DTCs is inhibited and a DTC will set.
| DTC | Condition |
|---|---|
| U1300 | Low voltage on the class 2 serial data circuit |
| U1301 | High voltage on the class 2 serial data circuit |
| U1305 | Either high or low voltage on the class 2 serial data circuit Some modules will set DTC U1305 if they are not capable of distinguishing between a short to battery voltage or ground. |
DTC U1300, U1301, or U1305
DTC Descriptors
This diagnostic procedure supports the following DTCs
- DTC U1300 Class 2 Data Link Low
- DTC U1301 Class 2 Data Link High
- DTC U1305 Class 2 Data Link Low or High