: The unit features an IP-Bus for controlling multi-CD players and is compatible with various accessories like USB adapters or Bluetooth modules (depending on the specific sub-model like the DEH-P4000UB ).
button until the digits flash. Use the volume knob to adjust.
You can access the official documentation through the following sources:
: Often caused by a loss of constant power; check the yellow "constant" wire in your vehicle's harness.