2018 Freightliner Cascadia Power Distribution

The 2018 Freightliner Cascadia operates using the OBD 16 system. Battery power in the Cascadia is protected by fuses located at standard and optional locations. The primary power distribution center for the vehicle is the Mega Fuse Junction Block (MFJB).

At the MFJB, battery power is directed to various components including the alternator, SAM Cab, SAM Chassis, powertrain PDM, and optional loads. Optional components such as the in-cab auxiliary PDM and chassis PDM are also connected to the MFJB.

Additionally, battery power from the MFJB can be routed to an inverter and a trailer cable. The Cascadia is equipped with a load disconnect switch that isolates the MFJB from the batteries.

However, it’s important to note that battery cables connecting the starter and emergency power circuits remain active even when the load disconnect switch is engaged.

Details of Freightliner Cascadia Power Distribution Module.

There are total 6 (six) no of Power Distribution Module in 2018 Cascadia:

  1. Powertrain PDM : The powertrain PDM provides battery and ignition power to the engine, aftertreatment device, and transmission, in addition to optional powertrain related circuits. The powertrain PDM is mounted above the driver-side inner fender.
  2. In-Cab Auxiliary PDM : The optional in-cab auxiliary PDM is installed in one of two locations. On 113 BBC vehicles, the PDM is mounted on an HVAC duct in the dash, and accessed by removing the auxiliary dash panel. On 125 BBC vehicles, the PDM is mounted on the engine tunnel inside the cab next to the central gateway. Battery power to the in-cab auxiliary PDM is protected by a 30-amp inline fuse located near the SAM chassis in the engine compartment.
  3. Chassis PDM : The optional chassis PDM is mounted on a bracket forward of the between-rail battery box, or inside the between-rail battery box. When mounted outside the battery box, there may be additional relays and an inline fuse on the lower side of the mounting bracket.
  4. SAM Cab : The SAM cab contains the electronic controls and the fuses and relays for cab electrical systems. It is located in the passenger side of the dash and accessed by removing the glove compartment. The shields covering the SAM cab must be re-installed after the SAM is accessed.
  5. SAM Chassis : The SAM chassis contains the electronic controls and the fuses and relays for most of the chassis electrical system. It is located on the driver side of the front wall in the engine compartment. The cover over the SAM chassis fuse and relay area must be completely latched into place after they are accessed.
  6. Powernet Distribution Box : The Powernet Distribution Box (PNDB), installed on EPA10 vehicles, provides 4 circuits that are always powered, and three high amperage circuits that are switched on and off with the optional cab load disconnect switch (CLDS). A flashing LED on the PNDB or the CLDS indicates an error with the system.
pic of  Freightliner Cascadia 2010 to showcase the fuse power distribution location pic
Freightliner Cascadia 2018 Power Distribution Module Location

2018 Freightliner Cascadia PDM, Fuse & Relay Location

1. Powertrain PDM

The powertrain power distribution module (PDM) is mounted in the engine compartment next to the left front inner fender.

pic of engine compartment of freightliner Cascadia 2010 with red circle to showcase the powertrain PDM Location pic

2. In-Cab Auxiliary PDM

On 113 BBC vehicles, the in cab auxiliary PDM is located on the HVAC duct behind the center dash panel and is accessed by removing the auxiliary dash panel. On 125 BBC vehicles, the PDM is mounted on the engine tunnel inside the cab, next to the central gateway.

a pic of freightliner Cascadia 2009 dashboard with red marking to showcase the auxiliary PDM location in Cascadia model 113 and 125

3. Trailer (Chassis) PDM

The chassis PDM is either mounted on a bracket forward of the between-rail battery box, or inside the between-rail battery box.

a pic of freightliner cascadia 2010 with red marking to showcase the chasis pdm location

4. SAM Cab

a pic of freightliner Cascadia 2010 dashboard with marking to show case the location of SAM cab location

5. SAM Chassis

The SAM chassis PDM fuse and relay in the 2018 Freightliner can be accessed from the engine side cabin, specifically located in the inner fender of the driver’s side. The connector or access point for these components is reachable from the driver’s cabin.

a pic of 2010 freightliner Cascadia dashboard  with red arrow marking to showcase the the location SAM chassis location.

5. Powernet Distribution Box

The powernet distribution box (PNDB) is located on the cab front wall, above the main ground junction block.

2010 freightliner cascadia pndb fuse box location

2018 Freightliner Cascadia Fuse Box Diagram

1. Powertrain PDM

2018 Freightliner Cascadia Powertrain PDM Fuse Box Diagram

2018 Freightliner Cascadia Powertrain PDM Fuse Box Details

NoFuse and Relay DetailsRating
F1ECM/MCM, BAT30 A
F2CPC, BAT10 A
F3Spare
F4SAM CHAS, EMG PWR, BAT20 A
F5Autolube20 A
F6Spare
F7Spare
F8PTO/IGN10 A
F9Spare
F10CPC/MCM/ACM, IGN5 A
      F11Optimized Idle Alarm, IGN10 A
      F12Autolube5 A
      F13SPARE
F14Spare
F15Spare
R1Ignition30/40 A
R3Spare10/20 A
R4PTO # 110/20 A
R5PTO # 210/20 A
R6Spare10/20 A
R7Autolube20 A
R8Spare20 A
R9Spare20 A
R10Spare20 A
R11Spare20 A
R12Spare20 A

2. In-Cab Auxiliary PDM

2018 Freightliner Cascadia In-Cab Auxiliary PDM Fuse Box Diagram

2018 Freightliner Cascadia In-Cab Auxiliary PDM Fuse Box Details

NoFuse and Relay DetailsRating
F1ECM/MCM, BAT30 A
F2Spare
F3TCU, BAT10 A
F4SPARE
F5Spare
F6DEF Line Heater, BAT20 A
F7TCU, IGN
F8Spare
F9ENG / SCR NOX Sensor, IGN20 A
F10ECM, IGN5 A
      F11Electric FAN, IGN10 A
      F12DCU, IGN5 A
      F13SPARE
F14Spare
F15Spare
R1PTO #2Mini
R2Ignition70 A
R3Auto Neutral Micro
R4DEF Line HeaterMicro
R5PTO # 1Micro
R6Electric FanMicro
R7Neutral InterlockMicro
R8Spare

3. Trailer PDM Fuse Box

2018 Freightliner Cascadia Trailer PDM Fuse Box Diagram

4. SAM Chassis Fuse Box

2018 Freightliner Cascadia SAM Chassis PDM Fuse Box Diagram

a pic of block diagram to showcase the the fuse box diagram of freigtliner cascadia sam chassis fuse box diagram

2018 Freightliner Cascadia SAM Chassis PDM Fuse Box Details

       NoFuse and Relay Details
SAM Chassis Relays
R1H2O SEP HEAT, IGN
R2TRLR TRN L
R3ABS/WIF/CAMERA, IGN
R4TRLR TRN R
R5TRLR MARKER
R6TRLR ABS, IGN
R7TRLR STOP LAMPS
R8TRLR POWER
R9TRLR TAIL LAMPS
SAM CHASSIS FUSE
F1EAPU (20A)
F2H2O SEP HEAT (20A)
F3ABS—BAT1 (20A)
F4ABS—BAT2 (10A)
F5TRLR TRN L (20A)
F6ABS—IGN (15A)
F7WIF/CAMERA (10A)
F8TRLR TRN R (20A)
F9TRLR MKR (30A)
F10SAM RELAY COILS (5A)
F11TRLR ABS—IGN (30A)
F12TRLR STOP (30A)
F13TRLR TAIL (20A)
F14TRLR PWR (30A)

5. SAM Cab Fuse Box

2018 Freightliner Cascadia SAM Cab PDM Fuse Box Diagram

a pic of block diagram to showcase freightliner cascadia 2010 (EAP 10) SAM Cab fuse box diagram pic

2018 Freightliner Cascadia SAM Chassis PDM Fuse Box Details

       NoFuse and Relay Details
SAM Cab Relays
R1PWR FD SPARE 1 and 3, BAT
R2PWR FD SPARE 2 and 4, BAT
R3HEATED SEAT, IGN
R4DASH PWR RCPT 1 and 2, BAT
R5FLT MGM SYS and CB, BAT
R6PWR RCPT3 and STD HVAC, BAT
R7DRV INFO/GAUGE, IGN
R8ICU/VEHICLE SYS, IGN
R9AMPLIFIER PWR, ACC
R10MIRROR HEAT
R11PWR RCPT 6 / FRIG, BAT
R12PWR RCPT 5, BAT
R13CAB LIGHTING, BAT
R14PWR RCPT4/CIR FAN/LAMP, BAT
R15PWR WINDOW, ACC
SAM Cab FUSE
F1PWR FD SPARE 1 and 3 (30A)
        F2CAB/SLPR HVAC CTRL/SHF PNL (15A)
        F3PWR FD SPARE 2 and 4 (30A)
        F4MSF (15A)
F5OBD J1939—BAT (10A)
F6DASH PWR RCPT 1 (15A)
F7DASH PWR RCPT 2 (15A)
F8PHONE/RADIO—BAT (15A)
F9AMPLIFIER PWR (20A)
F10CAB HVAC MTR (30A)
F11SLPR HVAC MTR (30A)
F12DR CTRL L (20A)
F13DR LOCK/SM CRUISE (20A)
F14FLT MGM SYS and CB (25A)
F15SLPR PWR RCPT 3 (20A)
F16STAND ALONE HVAC (7.5A)
F17SLPR PWR RCPT 4 (20A)
F18TELEMATICS/WARNING SYS (15A)
F19HEATED SEAT (20A)
F20CGW (2A)
F21AREA LIGHT (15A)
F22ICU—BAT (5A)
F23DR INF /GAUGE (15A)
F24ICU—IGN (10A)
F25DASH SPLICE PACK (7.5A)
F26SRS—AIRBAG (5A)
F27MIRROR HEAT L (10A)
F28MIRROR HEAT R (10A)
F29SAM RELAY COILS (3A)
F30PWR RCPT 6 / FRIG (20A)
F31SLPR PWR RCPT 5 (20A)
F32PWR FD SPARE 5 and 6 (25A)
F33SPOT LIGHT (20A)
F34BAGGAGE COMP LAMP (3A)
F35DOMELAMP CAB (15A)
F36AUX CIR FAN/RD LAMP (15A)
F37CLK/DRV INFO/CD/KEYLESS (15A)
F38DR CTRL R (20A)
F39PWR WINDOW R (15A)
F40PWR WINDOW L (15A)

6. PNDB Fuse Box

2018 Freightliner Cascadia PNDB Fuse Box Diagram

2010 freightliner cascadia pndb fuse box diagram

2018 Freightliner Cascadia PNDB Fuse Box Details

       NoFuse and Relay Details
PNDB ATC Fuse
ATC-AAfter treatment control module
ATC-BEmergency Power
ATC-CRadio and Clock
ATC-DAlternator Remote Sense
PNDB MIDI FUSE
MIDI-1Powertrain PDM
        MIDI-2SAM Chassis
        MIDI-3SAM Cab

WARNING: The terminal and harness assignments for individual connectors may vary depending on the vehicle’s equipment level, model, and market. It is recommended to refer to the fuse box diagram provided at the back of the fuse box cover for accurate information.


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