* Question
What are the two main tasks of the Data Bus Diagnostic Interface J533?
* Answer
The Data Bus Diagnostic Interface J533 is responsible for coordinating communication and power states across the vehicle’s CAN networks. Its two core tasks are:
1. Managing Terminal 15 run-on for the drivetrain CAN bus
After the ignition is switched off, some control units still need to exchange data for a short period.
J533 initiates Terminal 15 run-on, allowing key ECUs to remain powered temporarily. When their post-run tasks are complete, J533 sends the command to end run-on and transition toward sleep.
2. Controlling sleep and wake-up modes across the vehicle’s data buses
J533 supervises the readiness of the drivetrain, convenience, and infotainment CAN buses.
It performs two functions:
- Wake-up:Activates relevant CAN networks when a triggering event occurs (e.g., door unlock).
- Sleep:Ensures the networks power down only when all ECUs are ready, preventing premature shutdown and communication loss.
In summary:
J533 maintains stable communication after ignition-off through Terminal 15 run-on, and it orchestrates the orderly wake-up and sleep behavior of the vehicle’s CAN networks.
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