Read thru the complete info for BCM and DEM info. Lots of good stuff here.
Here are the VIDA info and the 2 codes.
Check for blown REM fuse F:23.
CEM-1A64
The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the differential electronic module (DEM) is not operating.
The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for more than 10 seconds.
Note! If CEM-1A6X diagnostic trouble codes (DTCs) are stored, the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the Control area network!
Substitute value
None.
Possible source
No power supply to the differential electronic module (DEM)
Open-circuit in the ground lead for the differential electronic module (DEM)
Contact resistance in the terminals
Open-circuit in the wiring for the CAN high speed network to the differential electronic module (DEM)
The differential electronic module (DEM) is not intended for this vehicle, for example a used control module with different software/hardware.
Hint:
If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the high speed network, this indicates a common fault in the Control area network, see the wiring diagram.
Fault symptom
Four wheel drive is not functioning.
Message in the display
General warning lamp lit
BCM-U011400 Failed communication with differential electronic module (DEM). General malfunction information. No information on malfunction type, B8444S
Diagnostic trouble code information BCM-U011400
Condition
Note! The diagnostic trouble code only applies to vehicles equipped with AWD and DSTC.
The differential electronic module (DEM) informs the brake control module (BCM) when all wheel drive is active. During all wheel drive operation, the brake control module (BCM) should not activate the stability function due to the risk of disrupting the differential electronic module (DEM). Diagnostic trouble code BCM-U011400 is generated if the brake control module (BCM) registers that there is no signal from the differential electronic module (DEM) or if the signal indicates that all wheel drive is not operational.
The diagnostic trouble code can be diagnosed when the ignition is on.
Substitute value
SC is blocked.
TC is blocked (AWD TRACS is blocked even though no warning light is on).
AYC is blocked.
Hint:
For information on abbreviations: Bromssystem, förkortningar
Possible source
Fault-trace the Differential electronic module (DEM).
Fault symptom
General warning light on.
Anti-spin is not operational.
The stability function is not operational.
The anti-skid function is not operational.
