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.
264912
7
Hand Control Unit (HCU) Area Electronic Data Link Missing Message
W
U100B86
265168
6
External Park Brake Request Electronic Data Link Signal Invalid
P
U100C86
265424
6
Lost Communication with CCIOM - Signal Invalid
P
U100C87
265424
7
Lost Communication with CCIOM - Missing Message
Q
U114686
280273
6
Brake Pedal Position Electronic Data Link - Signal Invalid
P
U114913
18897
19
Backup Power Supply - Circuit Open
R
U114B1C
19409
28
LIN12 Communication Net - Circuit Voltage Out of Range
S
U114C68
216273
8
Diagnostic Trouble Code (DTC) Notification Max Limit
Reached - Event Information
T
U1FFF68
262111
8
Factory Mode Active - Event Information
U
U300006
240
6
Electronic Control Unit (ECU) - Algorithm Based Failures
B
U300041
131312
1
Electronic Control Unit (ECU) - General Checksum Failure
B
U300042
131312
2
Electronic Control Unit (ECU) - General Memory Failure
B
U300044
131312
4
Electronic Control Unit (ECU) - Data Memory Failure
B
U300045
131312
5
Electronic Control Unit (ECU) - Program Memory Failure
B
U300046
131312
6
Electronic Control Unit (ECU) Calibration/Parameter Memory Failure
B
U30004A
131312
10
Electronic Control Unit (ECU) - Incorrect Component Installed
A
U300054
131312
20
Electronic Control Unit (ECU) - Missing Calibration
B
U300094
262384
20
Electronic Control Unit (ECU) - Unexpected Operation
A
U300313
1008
19
Battery Power - Circuit Open
V
U300316
1008
22
Battery Power - Circuit Voltage Below Threshold
V
U300317
1008
23
Battery Power - Circuit Voltage Above Threshold
V
Table 9 – Diagnostic Trouble Codes (DTCs)
21
Troubleshooting
SERVICE ACTION CODE TABLE
Refer to Table 10. To clear active Diagnostic Trouble Codes (DTCs) (as situations are remedied), simply clear (or “self‑heal”)
by removing and reapplying ignition power. Alternatively, DTCs may be cleared by using a PC‑based diagnostic tool.
SERVICE
ACTION CODE
ACTION
A
Replace the core module.
B
1.
2.
Check for software updates through an OEM-authorized service tool.
If there are no software updates and the Diagnostic Trouble Codes (DTCs) will not clear, replace
the core module.
1.
2.
Verify the compressor control line has no leakage when the compressor is unloaded.
Check the air dryer unloader/purge valve. Remove the cartridge. Check the area below the
cartridge in the sieve area (and below the sieve) for dirt, ice, or any sieve blockages blocked. If it
is not blocked, check the main exhaust silencer.
If no problem is detected on the compressor control line and there is no blockage of the air dryer,
replace the air dryer unloader/purge valve.
If the problem persists, replace the core module.
C
3.
4.
D
When compressor is loaded, check for leakage at the unloader/purge valve. No leakage is expected
until the cut-off pressure is reached after regeneration.
1.
E
2.
1.
2.
3.
F
4.
1.
G
2.
3.
4.
1.
2.
3.
H
4.
5.
6.
7.
8.
Check the primary and secondary circuits for leakage causing pressure difference between the
two circuits.
If the Diagnostic Trouble Code (DTC) does not clear after system inspection, replace the core
module.
Replace the cartridge. Reset the maintenance data of the cartridge using a diagnostic tool.
Check the reservoirs. If there is water in the reservoirs, drain the water from reservoirs.
Actuate and release the parking brake 30 times to eliminate water in the parking brake circuit to
help avoid potential damage.
If the maintenance interval is abnormal (cartridge lifetime, under six months), additional actions
must be taken:
• Check the vehicle for air leakage while the system is filled up with the parking brake released
(the engine does not need to be running).
• Check the compressor performance by measuring the air system charge time using an OEMauthorized service tool.
Check the pneumatic connection between the Trailer Control Module (TCM) and the GSAT
system.
Measure the trailer supply line actual pressure using an air pressure gauge.
Compare the actual pressure reading to digital sensor readings of the TCM and the GSAT
system.
Replace the TCM or GSAT system based on the air pressure gauge comparison.
Check whether the Hand Control Unit (HCU) movement is hindered or blocked.
Check the wiring between the trailer HCU and GSAT system for damage and/or continuity,
including connectors and pins.
Check the CAN and LIN wires and associated connector pins. Measure the CAN bus resistance
(60 ohm). Measure the LIN continuity end-to-end and continuity to ground.
Check the LIN communication (use another HCU to check).
Clear the Diagnostic Trouble Codes (DTCs).
If the DTCs return, refer to OEM documentation for diagnosis and replacement instructions for
the HCU.
Clear the DTCs.
If the DTCs return, replace the core module.
Table 10 – Service Action Codes
22
Troubleshooting
SERVICE
ACTION CODE
ACTION
1.
Check the wiring between the GSAT system and Hand Control Unit (HCU) for damage and/or
continuity, including connectors and pins.
Measure the LIN continuity end-to-end and continuity to ground.
Refer to OEM documentation for diagnosis and replacement instructions for the HCU.
If no issue is found with the HCU, replace the core module.
J
2.
3.
4.
K
Refer to OEM documentation for diagnosis and replacement instructions for the HCU.
L
1.
2.
3.
Repeat the park command via the Hand Control Unit (HCU).
Check the parking brake chamber operation per OEM guidelines.
Check the pneumatic connections.
1.
Visually inspect the heater module for defects or damage. Replace the heater module if
necessary.
Replace the core module.
M
2.
N
Check the control module parameter value.
P
Check the sender nodes (VMCU, EBS, and CCIOM) for proper operation and communication.
Q
1.
2.
3.
Check the CAN wires for damage and/or continuity, including connectors and pins.
Measure the CAN bus resistance (60 Ohm).
Replace the core module.
R
1.
2.
3.
4.
Check the wiring for damage and/or continuity, including connectors and pins.
Check the battery voltage (18-32V system).
Check the CCIOM failure. Refer to OEM service instructions.
Replace the core module.
S
1.
2.
Check the LIN wires for damage and/or continuity, including connector and pins.
Replace the core module.
T
1.
2.
3.
Check the workshop action for other active Diagnostic Trouble Codes (DTCs).
Diagnose and repair any active DTC(s).
Clear the fault history.
U
The core module has not been programmed. Contact the OEM for further assistance.
V
1.
2.
3.
Check the main connector wiring for damage and/or continuity, including connectors and pins.
Check the battery voltage (16-32V system).
Replace the core module.
1.
Check the wiring between the Hand Control Unit (HCU) and GSAT system for damage and/or
continuity, including connectors and pins.
Use another HCU to check the LIN communication.
Refer to OEM documentation for diagnosis and replacement instructions for the HCU.
If no issue is found with the HCU, replace the core module.
W
2.
3.
4.
Table 10 – Service Action Codes
23
PREVENTIVE MAINTENANCE
Preventive maintenance is not required for the Bendix®
GSAT® core module. Only silencer replacement is permitted.
Refer to B2Bendix.com for GSAT component replacement
instructions.
BENDIX PART
NUMBER
DESCRIPTION
K202684K57
Air Dryer
K202673K57
Air Dryer Cartridge and Carbon Filter
K201032K57
Air Dryer Heater - Attached
K181755K57
Air Dryer Heater - Detached
K099405K57
Air Dryer Silencer
K202622K57
Air Dryer Unloader
K202682K57
Core Module 2X EPB Attached
K202680K57
Core Module 1X EPB Attached
K190635K57
Sieve
K255971K57
Tractor Silencer
K202687K57
Trailer Silencer
BENDIX TECHNICAL SUPPORT
The Bendix Tech Team is available via email at
[email protected] and by phone at 1-800-AIR-BRAKE
(1-800-247-2725), option 2, Monday through Thursday,
8:00 a.m. to 6:00 p.m. and Friday, 8:00 a.m. to 5:00 p.m.
ET. Follow the instructions in the recorded message.
24/7/365 ACCESS
FULL SERVICE AT YOUR FINGERTIPS
1-800-AIR-BRAKE (1-800-247-2725)
TECHTEAM@BENDIX.COM
WEB-BASED TRAINING
LOG ON AND LEARN FROM THE BEST
SD-24-250V Rev 000 © 12/2024 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse • All Rights Reserved
24
- 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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