NHTSA ID Number: 10130764
Manufacturer Communication Number: IK0400056
TSB/Document Date: 2018-04-02
Summary
Brake Light Operation on HPV with Full Power Brakes; only models equipped with Meritor
WABCO Full Power Hydraulic Brakes
IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Countries:
Page 1 of 6
BAHAMAS, BOLIVIA, BELIZE, CANADA, CHILE, TAIWAN,
COLOMBIA, COSTA RICA, DOMINICAN REPUBLIC,
ECUADOR, EL SALVADOR, TRINIDAD AND TOBAGO,
Document
UNITED STATES, URUGUAY, VENEZUELA, ARUBA,
IK0400056
ID:
NICARAGUA, PERU, PUERTO RICO, Curaçao, GUAM,
GUATEMALA, GUYANA, HAITI, HONDURAS, JAMAICA,
KOREA, SOUTH KOREA, PANAMA
Availability: ISIS, Bus ISIS, FleetISIS, IsSIR
Revision: 5
Major
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English
Last
2/5/2018
Modified:
Current
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1/9/2009
James
Santos
10625
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Title : 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Applies To : HPV Brake Light Full Power Brakes
Change Log
Please refer to the change log text box below for recent changes to this article:
02/02/2018 ‐ Added information to correct 597‐2 setting during retarder operaton.
07/21/2016 ‐ Added Change Log. Added ISB specific information under Symptoms for 597‐2 and Cruise Control issues with Retarder use.
Description
The Full Power brake system has a unique operation for the brake switch. The ABS ECU receives an input from the brake switch and then
provides a signal to the Body Controller for brake light operation.
Symptoms
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN FMI MODULE
DESCRIPTION
597
0
Body Controller
Brake Switch reading above normal range
597
1
Body Controller
Brake Switch reading below normal range
597
2
Body Controller
Brake Switch inputs do not match *See note Below
597
7
Body Controller
Brake Switch stuck open or closed
• Brake lights stay on
• Brake lights not working
It has been identified that using a retarder on ISB equipped vehicles may cause a 597‐2 fault code, and kick out the cruise control. A
technical service case file will be required to resolve the issue.
Corrective Action for ISB powered vehicles setting 597‐2 during retarder use
DLB Feature to Remove
DLB Feature to Apply
0595AAD
0595BYT
These features are NOT dealer programmable
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IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Page 2 of 6
Troubleshooting
All voltage checks should be made with the connectors plugged in properly. Voltages will change when connectors are unplugged, resulting
in incorrect values being recorded. Always use proper troubleshooting techniques, such as a Breakout T. Do not pierce the wiring to make
voltage checks.
1. Check at Brake Switch connector 4037 Pin 2 for 12 volts. (Fused battery voltage).
2. When brakes applied check at Brake Switch 4037 Pin 1 for approx 10.5 volts. (If voltage is lower than 10 volts then replace brake
switch).
3. When brakes applied check at Full Power ECU connector 9511 Pin 10 for approx 10.5 volts. (Voltage should match signal at Pin 1 of the
Brake Switch)
4. When the brake pedal is not applied check the Body Controller connector1602‐E14 for 10 volts with the key on. There will be approx
4.5 volts when the key is off. (If voltage missing make sure accessory, ignition and main power circuit to body controller are good, also
check circuit N90F/A90F for short to ground).
5. When brakes applied check the Body Controller connector 1602‐E14 for close to 0 volts (If voltage is 2 volts or higher check circuit
N90F/A90F for short to power)
If the 9511 Connector is unplugged from the ABS ECU and the brake switch is still powered and plugged in, the signal wire from the brake
switch to 9511‐10 will have 12 volts on it. This is due to the type of brake switch being used, and the ECU providing circuit fault detection.
Signals to Watch
Use Diamond Logic Builder to make a session from the feature installed for the Full Power Brake System. For assistance in making a session
from a feature in DLB, please follow IK2600008 ‐ How to Diagnose Electrical Problems with Diamond Logic Builder
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IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
•
•
•
•
Page 3 of 6
0595ALR ‐ BC PROG, HYDRAULIC BRAKE SPLIT for Full Power System (Used in the screen shots)
With Key ON verify check marks for IGN and ACC power
Check for any fault codes follow IK2600036 ‐ Retrieving Fault Codes with DLB for assistance with this
Brake_Analog_Switch_Raw_Signal should change with brake application
Corrective action for ISB powered vehicles setting 597‐2 during retarder use
Remove DLB Feature
Apply DLB Feature
SIGNAL
VALUE
BRAKE PEDAL
Brake_Analog_Switch_Raw_Signal
2.3167v
ON
RELEASED
Brake_Analog_Switch_Raw_Signal
0.0048876v
ON
APPLIED
Brake_Analog_Switch_Raw_Signal
0.86999v
OFF
RELEASED
Brake_Analog_Switch_Raw_Signal
0.01955v
OFF
APPLIED
The values in the table above were measured on a working truck with DLB. The screen shot below is one example. The value shown in
DLB will not match the voltage you measure with the breakout box. The Body Controller uses resistors internally to measure volt drop.
That is why the value shown in the session does not match the physical value measured on the wire.
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IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Page 4 of 6
Component Location
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IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Page 5 of 6
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IK0400056 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Page 6 of 6
Parts Information
Part #
2605103C91
Hide Details
Description
Brake Switch
Qty.
1
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Copyright © 2018 Navistar, Inc.
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TSB/Document ID: IK0400056
Replacement Service Bulletin Number:
MFR Communication Date: 2018-02-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
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