Posted on

Scania Truck Alarm System Wake-up Signal Short-circuit Solution

Here is the instruction show you guide on how to solve Scania truck Alarm system Wake-up signal short-circuit to ground.



Scania SDP3 2.60.1 Truck Diagnostic Software

Scania Multi EPC 2024.03

Scania VCI3 High quality


Wake-up signal for Scania Communicator, short circuit

Error identification

Wake-up signal for Scania Communicator is short-circuited to ground.



Fault in harness-to-component connectors or cable harness for the wake-up signal for Scania Communicator.

Internal fault in ALM control unit E7.



The alarm system cannot initiate Scania Communicator.



Disconnect the harness-to-component connector to ALM control unit pin A5.

Measure for short circuits throughout the cable harness.

If there are a number of harness-to-component connectors between the wake-up signal and the ALM control unit, disconnect them and measure in order to isolate the fault.

If the fault is not in the cable harness it is probably an internal fault in ALM control unit E7.