Scania fault code 789
Code 789 is used by 7 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Solenoid valve for the propulsion battery cooling system
Open circuit in the solenoid valve circuit.
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COO Coordinator
Switch, vehicle level adjustment
All communication on the CAN bus for short-range radar on the right side has been interrupted.
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MBS
#Not implemented. AmbientAirTemperature error
Cooling with ac not functioning when should or running in cold ambient temp.
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DDU
BWE control unit, no CAN communication
The DDU control unit is not receiving CAN messages from the BWE control unit.
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ICL Instrument Cluster
Communication with the BCS control unit
No CAN message from the bodywork electrical system.
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CMS
Battery master switch
No or implausible signal from the battery master switch. The battery master switch does not disconnect from the batteries.
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DCU
Emergency opening system reset valve A, output, open circuit
The door control unit has detected a current that is too low in reset valve B for the emergency opening system (CN6-11).
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