NHTSA ID Number: 11012608
Manufacturer Communication Number: SD-24-250V
TSB/Document Date: 2025-01-07
Summary
Bendix Global Scalable Air Treatment (GSAT) system service data. This document is used for diagnostics and troubleshooting guide. System includes electronic air governor, air dryer, and electronic parking brake.
The battery power cycle is performed; and/or
»
n OEM-specified switch pattern is performed
A
successfully.
Bobtail Mode: This mode is intended to turn off the
LED of the trailer supply HCU in the event the vehicle is
driven with no trailer and the driver finds the LED to be
distracting. For instructions on how to use this feature,
refer to the OEM service documentation.
NORMAL OPERATING CONDITIONS
Refer to OEM documentation for HCU LED and dash
cluster telltale display status.
The preconditions to enter into vehicle maintenance
mode are:
»
»
Ignition key is on; and
»
Vehicle is below the speed threshold.
Next, the user should perform these actions:
»
Manually unpark the vehicle.
»
Press and hold the yellow tractor parking switch.
»
Switch off the ignition.
»
ey ignition switch back on. There should be
K
indication on the dash of successful entry into
workshop mode.
11
Configurations and Connections
CONFIGURATIONS AND CONNECTIONS
CONFIGURATIONS
There are two (2) configurations for the Bendix® GSAT®
system:
1. Attached: A Bendix
® air dyer and Bendix® core module
are combined into a single assembly.
2. Detached: A Bendix (or third-party) air dyer and Bendix®
core module are mounted separately on the vehicle.
Figure 3 – Configurations
12
Configurations and Connections
AIR DRYER AND CORE MODULE PNEUMATIC CONNECTIONS
Refer to Figures 4-6 and Table 4 for the air dryer and core module pneumatic connections.
Attached Configuration
Detached Configuration
Figure 4 – Air Dryer Configurations
13
Configurations and Connections
Figure 5 – 2xEPB Core Module Pneumatic Connections
Figure 6 – 1xEPB Core Module Pneumatic Connections
14
Configurations and Connections
PORT
THREAD
MAX TIGHTENING
TORQUE
M22x1.5
60 N•m
(44 ft-lb)
11
12
Air Dryer
2.1
4.5
M12x1.5
Energy inlet compressor
Energy inlet external air fill
Energy outlet to detached core module
Control line to detached core module
13
Supply from detached air dryer (can be used as tire filler)
14
Supply from second dryer (CFL) (can be used as tire filler)
21
Energy outlet service brake circuit, front
22
Energy outlet service brake circuit, rear
23
25
M22x1.5
26
Core
Module
30 N•m
(22 ft-lb)
DESCRIPTION
60 N•m
(44 ft-lb)
Energy outlet clutch and gearbox switch
Energy outlet air suspension
Energy outlet auxiliary devices
28.1
Tractor spring brakes
28.2
Tractor spring brakes
28.3
Tractor spring brakes
29.3
Trailer supply
4.3
Port for external release EPB tractor
4.4
4.6
M16x1.5
4.7
4/29
48 N•m
(35 ft-lb)
Port for external release EPB trailer
Control line to detached air dryer
Control line to second air dryer (CFL)
Compressor control line
Table 4 – Pneumatic Connections
15
Configurations and Connections
Core Module Electronic Connections
Refer to Figure 7 and Tables 6-8 for the core module electronic connections.
PIN NO.
DESCRIPTION
PIN NO.
DESCRIPTION
1
GND1
10
GND2
2
CAN_H
11
HCU GND
3
CAN_L
12
HCU_LIN
4
Unused
13
Unused
5
+U BATT
14
+U CCIOM
6
Unused
15
Unused
7
Unused
16
Unused
8
Unused
17
Unused
9
Unused
18
HCU Supply
Table 6 – 2X EPB Attached | 1X EPB Attached Connector
Configuration
PIN NO.
Figure 7 – Core Module Electronic Connections
DESCRIPTION
PIN NO.
DESCRIPTION
1
GND1
10
GND2
2
CAN_H
11
HCU GND
3
CAN_L
12
HCU_LIN
4
Unused
13
Unused
5
+U BATT
14
+U CCIOM
6
Unused
15
AD1_Heater_HS
7
Unused
16
AD1_Heater_LS
8
Unused
17
Unused
9
Unused
18
HCU Supply
Table 7 – 2X EPB with 1X Detached Air Dryer | 1X EPB with 1X
Detached Air Dryer Connector Configuration
PIN NO.
DESCRIPTION
PIN NO.
DESCRIPTION
1
GND1
10
GND2
2
CAN_H
11
HCU GND
3
CAN_L
12
HCU_LIN
4
Unused
13
Unused
5
+U BATT
14
+U CCIOM
6
AD2_Heater_LS
15
AD1_Heater_LS
7
AD2_Heater_LS
16
AD1_Heater_LS
8
Unused
17
Unused
9
Unused
18
HCU Supply
Table 8 – 2X EPB Attached with 2X Detached Air Dryer
Connector Configuration
16
Troubleshooting
TROUBLESHOOTING
OPERATIONAL CONDITIONS: FAULTED
If the Bendix® GSAT® system has a fault, one indicator will
be the LED on the HCU, and the other would be the cluster
telltale and Diagnostic Trouble Code (DTC) information.
For specific fault details, refer to the Troubleshooting Diagnostic Modes section.
NOTE: Blinking indicates a continuously blinking LED
independent of any driver input (e.g. button push or pull,
ignition cycle, etc.).
DIAGNOSTIC TROUBLE CODE (DTC) AND SERVICE
INFORMATION
If the GSAT system is powered and is faulted, the HCU
LEDs will blink. Loss of features is communicated through
either the vehicle instrument cluster or a standalone
Peripheral Human-Machine Interface (pHMI). Diagnostic
information is available by interfacing with the GSAT
system using the Bendix® ACom® Diagnostic Software.
This software provides the technician with access to
all available diagnostic information and configuration
capability, including ECU information and DTCs. Refer to
Tables 9 and 10.
OPERATING UNDER FAULTED CONDITIONS
If a fault is set, it may be possible to continue on the
vehicle route or it may be required to stop the vehicle
immediately. Refer to the vehicle dash lamps and the
OEM operator’s manual to determine which action is
appropriate.
Parking with a faulted EPB system requires the following
steps to ensure safety:
•
Stop the vehicle on a level surface and in a safe place.
•
Shut off the engine (key in the off position) and open
the driver-side window so the exhaust of air from the
spring brakes can be heard, which would indicate the
parking brakes being applied.
•
Attempt to park the trailer by pulling the trailer parking
switch (red). Listen for the exhaust of air.
•
Attempt to park the tractor by pulling the tractor parking
switch (yellow). Listen for the exhaust of air.
•
If either the tractor or trailer spring did not apply, key off
the vehicle and “fan down” the reservoirs by repeatedly
depressing the service brake pedal to automatically
apply the spring brakes.
•
Chock the wheels.
•
Remove the vehicle battery power if possible.
If the EPB system is reporting a fault and the vehicle must
be moved for emergency or repair purposes, the vehicle
should be towed per the OEM’s recommendations.
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Ideal for hydraulic and disc brakes
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
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TSB/Document ID: SD-24-250V
Replacement Service Bulletin Number:
MFR Communication Date: 2025-01-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
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