IK0800445 - Body Controller Updates for 500k Baud

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IK0800445
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Revision: 3

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ELECTRICAL SYSTEM

Created:

8/19/2013

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Modified:

6/16/2017

Author:

Charles
Schroeder

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Title : Body Controller Updates for 500k Baud
Applies To : All vehicles with 500k baud data link

Change Log
Please refer to the change log text box below for recent changes to this article:
06/16/2017 ‐ Added information for Non‐Multipexed 500k vehicles. Feature 0508096 (Figures 9‐10)
03/13/2017 ‐ Added additional information for the different wiring information at the BCM for both 500k feature codes. Features: 0508095 and 0508097
(Figures 5‐8)
08/02/2016 ‐ Added Body Controller Reference information for baud rates. Added RTC battery part number based on feedback.
07/13/2016 ‐ Article Created.

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Description
Overview of the recent updates to the Body Controller (BCM) on 500k baud data link equipped vehicles.
•
•
•
•

Basic Overview
Data Link Terminal Information
Grid Control Information
Real Time Clock (RTC) Battery

Basic Overview
Figure 1 ‐ Gen 4 BCM

Figure 2 ‐ Gen II BCM

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IK0800445 - Body Controller Updates for 500k Baud

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• The Gen 4 BCM is the correct service part for all vehicles equipped with a Body Controller. The Gen 4 BCM is backwards compatible with
trucks that were built with Gen II BCMs
◦ There is no Gen 3 BCM
• The same diagnostics are used on a Gen 4 BCM
• IK2600008 ‐ How to Diagnose Electrical Problems with Diamond Logic® Builder using a Session
• IK0800092 ‐ The First Check to Make When Troubleshooting Any Body Controller or ESC Issue
( Return to Top )

Data Link Information
500k Baud Vehicles will have a GREEN diagnostic connector. The green connector has 500k and 250k data link wiring present.
Figure 3 ‐ 250k
Diagnostic Connector

Figure 4 ‐ 500k
Diagnostic Connector

• There are identifying feature codes for 500k ‐ Phase 1, 500k ‐ Phase 2, and Non Multiplexed vehicles
• The wiring architecture is different on Phase 1, Phase 2, and Non Multiplexed vehicles
◦ 500k Phase 1 ‐ Feature 0508095 ‐ ELECTRICAL SYSTEM ENHANCED VCM FUNCTIONS for VCM Enhanced Functions
(Examples: ProStar, WorkStar, DuraStar with Green Diagnostic Connector)

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IK0800445 - Body Controller Updates for 500k Baud

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◦ 500k Phase 2 ‐ Feature 0508097 ‐ ELEC SYS MUX COMMON ARCHITECTURE for Electrical Common Architecture System
(Examples: LT, RH ‐ All have Green Diagnostic Connector)
◦ 500k Non Multiplex ‐ Feature 0508096 ‐ ELECTRICAL SYSTEM VCM FUNCTIONS NON‐MUX for Vehicle Control Module Functions, for
Non‐Multiplexed Vehicles
(Example: HX, PayStar, 9900 with Green Diagnostic Connector)

500k Phase 1 Vehicles ‐ Feature 0508095:
Figure 5 ‐ 500k Baud Data Link Connector at the BCM on a 500k Phase 1 Vehicle (Feature 0508095)

Figure 6 ‐ 250k Baud Data Link Connector at the BCM on a 500k Phase 1 Vehicle (Feature 0508095)

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IK0800445 - Body Controller Updates for 500k Baud

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500k Phase 2 Vehicles ‐ Feature 0508097:
Figure 7 ‐ 250k Baud Data Link Connector at the BCM on a 500k Phase 2 Vehicle (Feature 0508097)

Figure 8 ‐ 250k Baud Data Link Connector at the BCM on a 500k Phase 2 Vehicle (Feature 0508097)

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IK0800445 - Body Controller Updates for 500k Baud

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500k Non Multipex Vehicles ‐ Feature 0508096:
Figure 9 ‐ 500k Baud Data Link Connector at the BCM on a 500k Non Multiplexed Vehicle (Feature 0508096)

Figure 10 ‐ 250k Baud Data Link Connector at the BCM on a 500k Non Multiplexed Vehicle (Feature 0508096)

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IK0800445 - Body Controller Updates for 500k Baud

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Programmed BCM Installed on Vehicle with a Different Baud Rate:
Figure 11 ‐ Programmed 500k BCM Installed on a 250k Vehicle

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IK0800445 - Body Controller Updates for 500k Baud

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• All Body Controllers are shipped blank and can be programmed to 500k or 250k.
• This issue would only occur if you are using a module that was already programmed.

( Return to Top )

Grid Control
The BCM controls the power circuits for Ignition, Accessory and Cranking.
Accessory Grid Control output:

1605‐A Maximum Current: 20 Amps

Ignition Grid Control output:

1605‐B Maximum Current: 10 Amps

Starter Grid Control output:

1605‐T Maximum Current: 10 Amps

Below are the only conditions the Body Controller should observe for Key_Switch_State:
• Accessory Only
• Ignition and Accessory (Key on Engine Off or Key On Engine Running)
• Ignition and Starter input (Crank) ‐ (Accessory signal is removed during cranking)
If any other combinations of key switch state are observed a fault will be set. If the Accessory circuits are undercurrent or overcurrent a fault
will be set. The Body Controller will not supply power to the output when overcurrent or undercurrent faults are active. You must
troubleshoot the output wiring.
NOTE:
Do not diagnose these faults when INACTIVE without a driver complaint
Faults apply to Gen 4 Body Controllers with 500k Baud Only
SPN

FMI

Module and Source Address (SA)

Description

520981

14

Body Controller (33)

Only Ignition input is being detected (status of Key_Switch_State = 1)

520982

5

Body Controller (33)

Accessory Grid Undercurrent

520982

6

Body Controller (33)

Accessory Grid Overcurrent

520983

14

Body Controller (33)

Only Starter input is being detected (status of Key_Switch_State = 4)

520984

14

Body Controller (33)

Starter input and Accessory input are detected (status of Key_Switch_State
= 6)

520985

14

Body Controller (33)

Starter input, Accessory input, and Ignition input are detected (status of
Key_Switch_State = 7)

( Return to Top )

Real Time Clock (RTC) Battery
500k baud vehicles utilize the BCM for Real Time Clock (RTC) functionality.
•
•
•
•

The RTC battery is integrated in the circuit board and cannot be removed
If the RTC battery fails, it will set fault code 516824‐1 and a service battery will need to be installed
The service battery plugs into the circuit board
The RTC battery part number is 2514328C91
Figure 12 ‐ Service Battery

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IK0800445 - Body Controller Updates for 500k Baud

•

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RTC Service Battery
Figure 13 ‐ Battery Cover Removed

• If the battery needs to be serviced,
remove the battery cover to locate the
connector the service battery plugs into.

Figure 14 ‐ Service Battery Installed

• The service battery plugs into the circuit
board as shown.

BODY CONTROLLER REFERENCE

GENERATION

4

THERE ARE TWO VERSIONS OF THE GENERATION 4 BODY CONTROLLER. HERE'S HOW TO IDENTIFY
THEM:

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IK0800445 - Body Controller Updates for 500k Baud

NAVISTAR TRUCK GROUP GENIV BODY
CONTROLLER
NAVISTAR P/N: 4044470C1 JOB NUM:
SRENA S/N: 00000000 MANUF DATE: 000000
SRENA P/N: 00000‐0000 ASSEMBLED IN MEXICO
SERVICE PART *

NAVISTAR TRUCK GROUP GENIV BODY
CONTROLLER
NAVISTAR P/N: 4044470C4 JOB NUM:
SRENA S/N: 00000000 MANUF DATE: 000000
SRENA P/N: 00000‐0000 ASSEMBLED IN MEXICO
SERVICE PART *

4044470C1

4044470C4

• Early release, installed on early 2015
vehicles.
• Communicates at 250k baud
• Capable of communicating with 2015 model
year vehicles and older.

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• Current version of Generation 4 Body
Controller.
• Can communicate with 250k baud and 500k
baud data links.
• Can be installed on current model year and
older vehicles.

COMMUNICATION
BAUD RATE

COMMUNICATION
BAUD RATE

250k
500k
PLUG

A vehicle with a BLACK receptacle can
communicate at 250k baud.
A vehicle with a GREEN receptacle can
communicate at both 250k / 500k baud
(when properly programmed).

R
E
C
E
P
T
A
C
L
E

When connecting an Electronic Service
Tool (EST) to the vehicle:
• A BLACK plug on an interface cable
will only connect with a BLACK
receptacle.
• The GREEN plug on an interface cable
will connect to both BLACK and
GREEN receptacles.

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IK0800445 - Body Controller Updates for 500k Baud

250k

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250k
500k

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Copyright © 2017 Navistar, Inc.

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