VOLVO 2004 XC70
Follow these steps if you are having trouble communicating with your Brake Control Module or Differential Electronic Module.
This test helps diagnose causes for the following symptoms:
– No communication with Brake Control Module
– No communication with Differential Electronic Module (no signal)
– The only fault code in the system is CEM1A64
Disconnect the large connector on the DEM and check to see if communication with the BCM is restored. The DEM will often create network interference, making it impossible to communicate with the BCM until the DEM is removed from the network.