IK0800085 - ProStar Electrical System Load Shed Feature 08XEV

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Revision: 10

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ELECTRICAL SYSTEM

Created:

4/29/2007

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1/7/2019

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:
01/07/2019 - Udpated all graphics.
08/16/2017 - Author updated for feedback purposes.
06/24/2015 - Author updated for feedback purposes.

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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.

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
HVAC Rear Aux Unit
Refrigerator ‐ Some models also include a low battery voltage shut down
Video Entertainment

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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV

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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

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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

Figure 3 ‐ BCM Power Feed

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IK0800085 - ProStar Electrical System Load Shed Feature 08XEV

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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
Master Service Information Site
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