sb54287
Service Bulletin Details
Public Details for: sb54287
Sb54287 powernet distribution box fuse retention on the keep-alive
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Powernet Distribution Box Fuse Retention on the Keep-Alive Circuit FLA COE FLB COE FLD Conventional Business Class FLC 112 Conventional Century Class Conventional Argosy COE Cargo Columbia > 122SD and Coronado > Business Class M2 > Cascadia > 108SD/114SD 54-287 Freightliner Service Bulletin General Information Some powernet distribution box (PNDB) modules may experience poor fuse retention on the keep-alive circuits. This could cause intermittent operation of any devices supplied by these circuits. On units equipped with remote sense, it could result in the alternator overcharging, even on alternators capable of self-regulating. NOTE: A self-regulating alternator may substitute the voltage reading from its primary battery positive, in the event that the remote sense line is a constant open circuit. If the fuses are not seating properly on the keep-alive circuits, or are falling out, use the instructions in this bulletin to replace the PNDB. PNDB Replacement NOTE: The powernet distribution box (PNDB) is located on the cab frontwall, above the main ground junction block. See Fig. 1. 1. Disconnect all batteries. If the vehicle is equipped with an auxiliary battery bank, disconnect these batteries as well. 2. Open the hood. IMPORTANT: Inspect the keep-alive and cab load disconnect switch (CLDS) connectors and make sure that the plugs are in unused connector cavities. Install plugs to seal the connector if any are missing. 3. Disconnect the cab load disconnect switch (CLDS) connector, if equipped. 4. Disconnect the keep-alive circuit connector from the PNDB. 4.1 Using a flat-head screwdriver, push the red locking tab up. 4.2 Press and release the tab, then remove the connector. See Fig. 2. 5. Disconnect the power cables from the PNDB. 6. Remove the PNDB. 7. Position the new PNDB on the frontwall, and attach the two mounting nuts. 8. Attach the keep-alive circuit connector and the CLDS connector. 9. Connect the power cables. Torque the nut 15 lbf·ft (20 N·m). 10. Connect all batteries, including the auxiliary batteries, if equipped. 11. Close the hood. Warranty This procedure is warrantable only if the described condition exists and the repair is performed within the applicable base or extended coverage warranty period. If a failure is not found, this procedure is considered preventive and warranty does not apply. Normal warranty applies. See Table 1 for OWL VMRS codes and labor allowance information. Enter this service bulletin number in the Service Bulletin # field. Freightliner Service Bulletin, October 2014 Page 1 54-287 Powernet Distribution Box Fuse Retention on the Keep-Alive Circuit Freightliner Service Bulletin FLA COE FLB COE FLD Conventional Business Class FLC 112 Conventional Century Class Conventional Argosy COE Cargo Columbia > 122SD and Coronado > Business Class M2 > Cascadia > 108SD/114SD 1 4 9 8 1 7 2 3 4 11/18/2009 f545618 1. Circuit Connector Locking Tab 6 Fig. 2, Removing the Circuit Connector 5 06/29/2010 1. SAM Cab Power 2. SAM Chassis Power 3. Powertrain PDM Power 4. Mounting Nut 5. MGJB Ground f545661 6. Fuse Cover 7. Power (B+) 8. Disconnect Switch (CLDS) Connector 9. Keep-Alive Circuit Connector Fig. 1, Powernet Distribution Box Primary Failed Part Powernet Distribution Box OWL VMRS Codes and Labor Allowance Component Cause Code SRT Code Description Code Powernet Distribution Box, Inspection, 034-004-181 23 285-5025A R/R Time: Hours 0.5 Table 1, OWL VMRS Codes and Labor Allowance Page 2 Freightliner Service Bulletin, October 2014