U0073 DME control module, communication

U0073

DME control module, communication

NOTE: Internal function test completed.

Diagnostic conditions
The DME control module initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.

DME control module wake-up through:
- event-induced CAN message
- "Ignition on"

Possible fault causes
- No power supply for DME control module
- DME control module incorrectly coded
- Short circuit or open circuit in the CAN drive
- DME control module faulty (in most cases the cause is not the DME control module but incorrect coding.)

Fault effects
- Communication via the CAN drive is no longer possible.
- No other control modules are able to communicate with the DME control module.

Affected contacts on the DME control module connector

Connector A:
- 1 power supply - terminal 30
- 2 power supply - terminal 15
- 4 ground supply - terminal 31
- 5 ground supply - terminal 31
- 6 ground supply - terminal 31

Connector D:
- 36 CAN drive high
- 37 CAN drive low