DTC U1301: Class II Data Link High: Notes

Modules connected to the Class II serial data circuit monitor for serial data communication during normal vehicle operation. Operation commands are exchanged among the modules. In addition to this, Node Alive (State of Health) messages are transmitted by each module on the Class II serial circuit about once every 2-5 seconds. When the module detects no messages and a high voltage on the Class II serial data circuit for approximately three seconds, U1301 is set and the setting of all other communication DTCs is inhibited.