NHTSA ID Number: 10156570
Manufacturer Communication Number: IK0800085
TSB/Document Date: 2019-04-03
Summary
ProStar Electrical System Load Shed Feature 08XEV
IK0800085 - ProStar Electrical System Load Shed Feature 08XEV
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TRINIDAD AND TOBAGO, UNITED STATES, URUGUAY,
IK0800085
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Availability: ISIS, FleetISIS, IsSIR
Revision: 11
Major
System:
ELECTRICAL SYSTEM
Created:
4/29/2007
English
Last
Modified:
3/14/2019
Author:
Charles
Schroeder
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Title : ProStar Electrical System Load Shed Feature 08XEV
Applies To : ProStar with feature 08XEV Load Shed
Change Log
Please refer to the change log text box below for recent changes to this article:
03/14/2019 01/07/2019 08/16/2017 06/24/2015 -
Added note for not setting load shed under 11.8v
Udpated all graphics.
Author updated for feedback purposes.
Author updated for feedback purposes.
Description
Electrical Load Control and Shedding (ELCS) is an optional feature (standard w/ sleepers) used to protect the vehicle's batteries from excessive
discharge by automatically shutting down electrical loads to conserve battery power. When Load Shed is initiated by the BCM, the relay on the
engine cover will open and power to various components will be turned off.
When troubleshooting ANY electrical issue, you MUST insure the battery voltage is above 12.1. This will ensure Load Shed is off, and all
accessories, switch packs, and electronic brake components are powered up.
The Body Controller (BC) monitors the battery voltage at the J6 Power Feed connector of the BC (this is where the big red power cable connects
to the BC) and when battery voltage drops below 12.1 volts for 30 seconds:
1. The operator will receive an audible and visual indication that load shedding is about to disable electrical loads. The gauge cluster will
display the message "Load Shedding" in the LCD display and the cluster will emit 5 short beeps
2. The Accessory loads will be shut off by the BC sending a momentary 12v to pin C of the Load Shedding relay (Malone relay). This will cause
the relay to open the circuit between pins B1 and B2 of the Load Shedding relay. Refer to circuit diagram below.
It is not recommended to set Load Shed (Electrical Load Control) below 11.8v
Symptoms
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Loss of accessory powered items:
Compass
Bendix
/ Meritor Collision Avoidance System Displays and Front Radar
All Switch Packs
Tire Pressure Diagnostic
Task Lighting
Spot Light
Work Lights
Cigar Lighting System
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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV
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HVAC Rear Aux Unit
Refrigerator ‐ Some models also include a low battery voltage shut down
Video Entertainment
Power Amp for Subwoofer
Motorized Mirrors
Heated Mirrors
Customer Electrical Accessory Accommodation
Heated Seats
Fuel Heater (DC version only)
Air Dryer and Drain Valve Heating
Data Logger / Event Recorder
Courtesy Lights
Accent Lights
Air Shield Light
Running Lights
Fog Lights
Floor Lights
Secondary Display (SD)
Secondary Instrument Cluster (SIC)
Engine Monitors
Prognostic and Diagnostic Module
Possible Diagnostic Trouble Codes
SPN
FMI
Module
Description
520705
5
Body Controller
Load Shed OFF Relay Under Current Or Open Circuit
520705
6
Body Controller
Load Shed OFF Relay Over Current
520706
5
Body Controller
Load Shed ON Relay Under Current Or Open Circuit
520706
6
Body Controller
Load Shed ON Relay Over Current
Troubleshooting
While troubleshooting, never apply 12v to the Malone relay input terminals A and C for longer than one second. This is a latching relay and
only requires voltage for 20 milliseconds to change states. If you apply 12v for longer than one second, you will burn up the relay.
1. Check for diagnostic trouble codes using DLB.
◦ For instructions on how to do this properly, please follow IK0800399 ‐ How To Export DLB Fault Codes To Attach To A Case File
2. Check battery voltage at the batteries with a multimeter.
3. Check the voltage at the J6 Power Feed connector of the BC (this is where the big red power cable connects to the BC) with a multimeter.
For location of this, refer to Figure 2 below.
4. The voltage from Step 2 and Step 3 should be the same. If they aren't you need to trace the wiring and figure out what's causing them to be
different.
5. Create a session with the signals below in it.
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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV
Page 3 of 5
6. Compare the Battery_Voltage_Signal in DLB to the reading on your multimeter in Step 2 and Step 3. They should all be the same.
Circuit Diagrams
Figure 1 ‐ Circuit Diagram
Component Locations
Figure 2 ‐ Load Shed Relay Location on Engine Cover
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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV
Page 4 of 5
Figure 3 ‐ BCM Power Feed
Warranty Information
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
Other Resources
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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV
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TSB/Document ID: IK0800085
Replacement Service Bulletin Number:
MFR Communication Date: 2019-03-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
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