Freightliner Columbia PDM Guide | PDF | Electrical Connector
The Freightliner Columbia uses a robust electrical architecture, often featuring multiplexing to reduce the physical amount of wiring needed. Key components identified in electrical diagrams include:
Usually located in the electrical compartment behind the seat or under the dash, this module houses the primary fuses and relays.
The ICU (Instrument Cluster Unit) manages the backlit gauges and dashboard indicators. How to Read a Freightliner Wiring Diagram
A central "brain" that communicates with "Smart Switches" throughout the cab.
