NHTSA ID Number: 10056543
Manufacturer Communication Number: FSB-375-012
TSB/Document Date: 2014-12-24
Summary
MACK
: WHEN THRESHOLD OF HIGH VOLTAGE HAS BEEN MET, THE LIFEGUARD BATTERY PROTECTION SYSTEM (LVD) RELAY MAY NOT TURN LOADS BACK ON, DUE TO AN ASSEMBLY ERROR AT SUPPLIER. MODEL 2010-2014 CHU, CXU. *PE
Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
Date
Group
No.
Release
Page
8.2014
375
012
01
1(9)
Battery Protection System (LVD) Relay
CHU, CXU
SB-10056543-5075
FSB 375-012, Battery Protection System (LVD)
Relay
(August 2014)
On certain Mack Trucks built from 01/01/2010 to 06/13/2014 with the Lifeguard Battery
Protection System (LVD), the LVD relay may not turn the loads back on when the “High”
voltage threshold is met. This is due to an assembly error at the supplier.
Inspection
You must read and understand the precautions and guidelines in Service Information,
group 3, “General Safety Practices, Electrical” before performing this procedure. If you are
not properly trained and certified in this procedure, ask your supervisor for training before
you perform it.
1 Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheel, and placing the transmission in neutral.
W7086748
PV729-FSB375-012
USA65821
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
375
012
01
2 Raise the bunk lid by pulling knob out and lifting bunk.
W8092003
1. Knob
3 Locate and check the LVD relay for a Green Dot.
a. If Green Dot is PRESENT, no further action required.
or
b. If Green Dot is NOT PRESENT, proceed to the repair section below.
W8092004
1. Green Dot
Page
2(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
4 Lower the bunk lid.
5 Remove the wheel chocks.
W7086759
Group
No.
Release
375
012
01
Page
3(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
375
012
01
Required Parts
Quantity
Part Number
1
22461978
Description
LVD Relay
Repair
You must read and understand the precautions and guidelines in Service Information,
group 3, “General Safety Practices, Electrical” before performing this procedure. If you are
not properly trained and certified in this procedure, ask your supervisor for training before
you perform it.
1 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
W3086747
Page
4(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
2 Remove the cable ties.
W3092005
3 Disconnect the harnesses.
W3092006
Group
No.
Release
375
012
01
Page
5(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
375
012
01
4 Remove the LVD relay.
Note: 2 screws, 1 upper and 1 lower
W3092007
1. Screws
2. LVD Module
5 Install the LVD relay.
Note: Start the lower screw first and then rotate the LVD to align with top screw.
Note: 2 screws, 1 upper and 1 lower
W3092008
1. Screws
2. LVD Module
Page
6(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
6 Connect the harness.
W3092006
7 Secure with cable ties as required.
W3092005
Group
No.
Release
375
012
01
Page
7(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
375
012
01
8 Install all the previously removed cables to the negative (ground) battery terminals.
W3086758
9 Start the engine and check for proper operation.
10 Remove the wheel chocks.
W7086759
Page
8(9)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
375
012
01
Reimbursement
This repair may be eligible for reimbursement if a product failure was
experienced within time and mileage limits of the applicable Warranty
coverage. Reimbursement is obtained via the normal claim handling
process.
Reimbursement
UCHP
Reimbursement
eWarranty
Claim Type (used only when uploading from the Dealer Bus. Sys.)
01
01
Primary Labor Code
Inspection
3000–06–09–01
0.3 hrs
7213E–01–80
0.3 hrs
Repair only
3759–03–09–01
0.3 hrs.
7213F–01–80
0.3 hrs.
Causal Part
20846252
(1MR583M)
20846252
(1MR583M)
Labor Code
Mack Trucks Inc. reserves the right to make any changes in design or to make additions to or
upon its products without incurring any obligations to install the same on vehicles previously
built.
Page
9(9)
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TSB/Document ID: FSB-375-012
Replacement Service Bulletin Number:
MFR Communication Date: 2014-08-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM:12V/24V/48V BATTERY
MFR Component System:
MFR Component Subsystem:
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