2008 Freightliner Cascadia Power Distribution

The 2008 Freightliner Cascadia operates using the EAP 07 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.

pic of line diagram to showcase the freightliner Cascadia power distribution layout
EAP 07 Freightliner Cascadia 2008 Power Distribution Layout

Details of Freightliner Cascadia Power Distribution Module.

There are total 5 (five) no of Power Distribution Module in 2008 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.
pic of  Freightliner Cascadia 2007 to showcase the fuse power distribution location pic
2008 Freightliner Cascadia Power Distribution Module Location

2008 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 2007 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 2007 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 2007 with red marking to showcase the chasis pdm location

4. SAM Cab

a pic of freightliner Cascadia 2007 dashboard with marking to show case the location of SAM cab location

5. SAM Chassis

The SAM chassis PDM fuse and relay in the 2008 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 2007 freightliner Cascadia dashboard  with red arrow marking to showcase the the location SAM chassis location.

2008 Freightliner Cascadia Fuse Box Diagram

1. Powertrain PDM

2008 Freightliner Cascadia Powertrain PDM Fuse Box Diagram

a pic of block diagram to showcase the freightliner Cascadia 2007 (EAP 07) powertrain fuse box diagram pic

2008 Freightliner Cascadia Powertrain PDM Fuse Box Details

       NoFuse and Relay Details
F1Not Used
F2TRANS ECU IGN FUSE
F3FUEL HEATER FUSE
F4FUEL HEATER FUSE
F5ENGINE IGN
F6SAM CHASS
F7PLVD/REMOTE SENSE
F8ENGINE ECU BATT FUSE
F9CPC/ENG ECU BATT FUSE
F10TRANS BATT FUSE
      F11TRANS BATT FUSE
      F12TRANS BATT FUSE
      F13TRANS BATT FUSE
R1TRANS BACKUP RELAY
R2MEIIR RELAY
R3NEUTRAL RELAY/START ENABLE
R4SPARE RELAY/HEAT RELAY
R5N/A
R670A IGN RELAY

2. In-Cab Auxiliary PDM

2008 Freightliner Cascadia In-Cab Auxiliary PDM Fuse Box Diagram

a pic of block diagram to showcase freightliner cascadia 2007 (EAP 07) auxiliary fuse box diagram pic

3. SAM Chassis Fuse Box

2008 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

2008 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)

3. SAM Cab Fuse Box

2008 Freightliner Cascadia SAM Cab PDM Fuse Box Diagram

a pic of block diagram to showcase freightliner cascadia 2007 (EAP 07) SAM Cab fuse box diagram pic

2008 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)

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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