IK1900252 - Excessive Cab and Sleeper Temperature when No­Idle Heater is Operating

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Countries:

CANADA, UNITED STATES

Document ID: IK1900252

Availability:

ISIS, FleetISIS, Body Builder,
IsSIR

Revision:

3

Major System:

ACCESSORIES

Created:

11/10/2017

Current
Language:

English

Last
Modified:

12/5/2017

Author:

Charles
Schroeder

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Title : Excessive Cab and Sleeper Temperature when No­Idle Heater is Operating
Applies To : LT with 16UZL

Change Log
Please refer to the change log text box below for recent changes to this article:
12/05/2017 ‐ Added Figure 1 to delete VIN from DLB. Added Figure 4 to Get Module Data, prior to Updating Module. Added printable
version of the Rear HVAC Controller, so dealer can give to driver if desired.
12/01/2017 ‐ Updated images to reflect Front HVAC Control Module for Source Address 25 requiring the update.
11/29/2017 ‐ Removed Temporary Correction 2 information. It should no longer be used. Updated Temporary Correction 1 information to
inlcude checks to ensure the system is wired an programmed properly at the BCM when HVAC control head software 1746002 is applied.
11/15/2017 ‐ Initial Article Release.

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

Description
Operation of the (Eberspaecher) Espar Hydronic No‐Idle heater, part of feature code 16UZL, during mild to cool temperatures may
result in elevated cab and sleeper temperatures resulting in driver discomfort. This is a result of the front heater automatically
setting to full heat, 33% blower speed when the No‐Idle Heater is in use. This article will cover the options to help alleviate the
excessive temperatures in the vehicle.
• To optimize the sleeper temperature during (Eberspaecher) Espar heater operation, the driver should set the bars in the
display to the approximate temperature setting shown below.
◦ Set the fan speed to preferred setting
◦ Set the temperature to desired sleeper temperature
◦ Image below is for representation only
• A printable version of the Sleeper Controller shown below is available ‐ Click Here
◦ You can provide the printout to the driver if desired
LED
Indicators

0

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16 17 18 19 20

Temperature
60 62 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 81 83 85
°F

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IK1900252 - Excessive Cab and Sleeper Temperature when No­Idle Heater is Operating

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Symptoms
Diagnostic Trouble Codes & Dashboard Indicator Lights:
DTC/Light

Description

No Faults or Warning Lights
Customer Observations or Concerns:
• Excessive sleeper temperature
• Cab temperature noticeably warmer than sleeper temperature when curtain is closed

Special Tools / Software
Tool Description

Tool Number Comments

International® Diamond Logic® Builder (DLB)

Instructions

EZ‐Tech® Software

Service Parts Information
Kit Description

Part Number

Quantity Required

Notes

Not Applicable

Diagnostic Steps
Not Applicable

Repair Step(s)
The following steps will outline how to disable the front cab heater system during No‐Idle Heater operation, as well as cover the
future improvements that will be implemented to the system.
• Temporary Correction 1 for this concern is to make a programming change in the Front HVAC Control Head Module (Source
Address 25)
◦ This programming change will allow the driver to override the front cab controls after the No‐Idle Heater is in use
◦ The front cab system will operate at the front cab controls current setting (what the driver set the controls to override)
when the engine enters an Auto Start event
◦ The front cab system will go back to default values after an Auto Start/Stop event is completed
• After the engine auto stops and the No‐Idle Heater turns back on, the front cab will return to low blower, floor,
fresh air (Temperature will remain at driver selection)
Front HVAC Default Setting

Driver Override Ability

Blower speed

33%

Yes*

Inlet

Fresh Air

Yes*

Mode

Floor

Yes*

Temperature

Driver Selection

Yes^

* After an Auto Start/Stop event: Blower Speed, Inlet and Mode will return to default values.

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IK1900252 - Excessive Cab and Sleeper Temperature when No­Idle Heater is Operating

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^ Temperature will remain at Driver Selection at all times.

Overriding blower to speeds below 3 or changing the inlet to recirculation mode may cause
issues with condensation in cab.
• Temporary Correction 2 is no longer applicable. Temporary Correction 1 should be used.
• Permanent Correction is in development
◦ Details are listed in the Permanent Correction section below

Front HVAC Control Module Software ‐ Temporary Correction 1
Any vehicle that used Temporary Correction 2 applied will need to be changed back to the vehicle's original programming. Steps
are listed to verify programming.

The vehicle must be at its original operating state at the completion of Temporary Correction 1
Updating the Front HVAC Control Head Software
1. Prior to connecting to the vehicle, DELETE the VIN from DLB if you've ever been connected to the vehicle you're preparing to
program
◦ This step needs to be performed PRIOR to connecting to the vehicle
Figure 1 ‐ Delete Vehicle from Diamond Logic® Builder (DLB)

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This step needs to be performed PRIOR to connecting to the vehicle
2. Connect to the Body Control Module (BCM) using DLB with the Key OFF (Figure 2, Item 1)
◦ You may need to select the com link you are using from the Tools menu
Figure 2 ‐ Delete Vehicle from Diamond Logic® Builder (DLB)

1. Select the appropriate Com Link

Notice no VIN is displayed. The VIN for the vehicle you are preparing to program should have been deleted in
step 1, prior to connecting
3. Locate Front HVAC Control Module in the Detected Modules tab (Figure 3, Item 2)
Figure 3 ‐ Connected to BCM Locate Front HVAC Control Module

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IK1900252 - Excessive Cab and Sleeper Temperature when No­Idle Heater is Operating

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1. Connected to the Body Control Module
2. Locate Front HVAC Control Module in the Detected Modules tab (Source Address 25)
4. Right Click on Front HVAC Control Module and select Get Module Data
◦ This will ensure the Kernel information displayed is what is currently programmed into the module
Figure 4 ‐ Get Module Data

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1. Connect to the Body Control Module using Diamond Logic® Builder
2. Locate Front HVAC Control Module in the Detected Modules tab (Source Address 25)
5. Right Click on Front HVAC Control Module and select Update Module
◦ The Kernel for the Module will update
Figure 5 ‐ Update Front HVAC Control Module

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1. Right Click on Front HVAC Control Module and select Update Module
2. The Kernel will update to the latest available software (1746002) for the Front HVAC Control Module
(Source Address 25)
6. Right Click on Front HVAC Control Module and select Program Module
◦ This will program the Front HVAC Control Module Only
◦ They Key should be OFF for programming
Figure 6 ‐ Program Front HVAC Control Module

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1. Right Click on Front HVAC Control Module and select Program Module
• This will program the Front HVAC Control Module Only

Verify Correct Feature Code in DLB (Temporary Correction 1)
1. Navigate to the Features Tab in DLB
2. Filter to Bergstrom
3. Click OK
Figure 7 ‐ Features Tab

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1. Features Tab
2. Filter Icon
3. Search Box
4. If Feature Code 0597111 is already installed, no programming is required.
◦ Continue to Figure 7 to verify J6‐L has circuit H75WC installed
5. If Feature Code 0597062 is installed:
◦ Click on the box to remove Feature 0597062
◦ Click on the box to install Feature 0597111
◦ Click on the Save Icon to save the changes to the vehicle you are connected to
Figure 8 ‐ Bergstrom Feature Codes

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1. 0597062 ‐ This Feature Code should NOT be Installed
2. 0597111 ‐ This Feature Code SHOULD be installed
3. Save Icon
6. Program the Body Control Module (BCM) using the Program Module Option
◦ Verify 'ESC' is selected under 'Detected Modules'
◦ They Key should be OFF for programming
Figure 9 ‐ Program BCM

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1. Program drop down Icon
2. Program Module

Verify Circuit H75WC is installed in Connector J6 ‐ Pin L at the BCM (Temporary Correction 1)
After the Front HVAC Control Module Software had been updated to 1746002, and it has been verified Feature Code 0597111 is
installed, check the following:
1. Turn on the Espar No‐Idle Heater
2. Verify the Front Cab blower motor is running
3. If the Front Cab blower motor is NOT running:
◦ Verify fuse B1‐H (30 Amp) is installed for the Front Cab blower motor
◦ Verify wire H75WC is installed into Connector J6 ‐ Pin L at the BCM (Figure 10)
Figure 10 ‐ Heater On Signal

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1. Connector J6 ‐ Pin L
◾ No Idle Heater ON signal to the BCM

Disable Front HVAC during No‐Idle Heater No‐Idle Heater Operation ‐ Temporary Correction 2
Temporary Correction 2 has been removed and should not be used. If the Front HVAC System has been disabled, the
functionality of the Front HVAC System needs to be restored, and Temporary Correction 1 should be followed. Temporary
Correction 2 had the potential to cause heavy condensation in the cab. Temporary Correction 1 operates to prevent in‐cab
condensation.

Front HVAC Control Head Software ‐ Permanent Correction
Permanent Correction is under development.
• Permanent correction will be a programming change in the Front HVAC Control Head
• The front cab HVAC will keep the temperature and mode setting at the driver selection
• The front cab HVAC will default the blower to low speed, and the fresh air door will open
◦ The driver can override the fresh air door, and put the front cab HVAC into recirc, which will close the fresh air door
• The front cab HVAC will remain at the driver selection for temperature and mode when the No‐Idle Heater is in use
• The front cab HVAC will remain at the driver selection for temperature and mode when the engine enters an auto start event
• The front cab HVAC will remain at the driver selection for temperature and mode after the engine auto stops and the No‐Idle
Heater turns back on

Warranty Information

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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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Copyright © 2018 Navistar, Inc.

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