NHTSA ID Number: 11029914
Manufacturer Communication Number: SD-27-5023V_002
TSB/Document Date: 2026-03-09
Summary
Bendix
® GSBC® (Global Scalable Brake Control) System and EBS-90™ Electronic Control Unit (ECU) for Volvo® Trucks The Bendix® GSBC® (Global Scalable Brake Control) is a 24V Electronic Braking System (EBS) that is comprised of both hardware and software components that work together to control the service braking system of the vehicle. The GSBC system utilizes electronic control systems but continues to use air to apply and release the brakes, and can be configured to provide brake control functionality such as the Bendix® Electronic Stability Program (ESP®) and Antilock Brake System (ABS) as desired by the vehicle manufacturer.
SECONDARY RESERVOIR
11
BENDIX® GSBC® EPM-90™ ONE CHANNEL
ELECTRO-PNEUMATIC MODULE (EPM-1C)
18
BENDIX® GSBC® EBS-90™ CENTRAL
ECU
5
DRAIN VALVE
12
BENDIX® GSBC® EPM-90™ TWO CHANNEL
ELECTRO-PNEUMATIC MODULE (EPM-2C)
19
BENDIX® GSBC® EBS-90™ CENTRAL
ECU MUD COVER
6
TRAILER CONTROL
GLADHAND
13
BENDIX® GSBC® ETPCM-90™ ELECTRONIC
TRAILER PRESSURE CONTROL MODULE
20
ELECTRONIC PARKING BRAKE
HAND CONTROL UNIT (HCU)
7
TRAILER SUPPLY
GLADHAND
14
BENDIX® GSBC® M-50QR™ QUICK
RELEASE ANTILOCK MODULATOR
21
QUICK RELEASE VALVE (OPTIONAL)
Table 3 – GSBC System Schematic Example Components
12
SD-27-5023V Rev 002 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
System Schematics
GSBC WIRING SCHEMATIC WITH COMPONENT PINOUTS
FOR CONNECTOR BREAKDOWNS, GO TO SECTIONS:
1
CENTRAL ECU X1
CONNECTOR WIRING
AND PINOUT (PAGE 14)
3
CENTRAL ECU X3
CONNECTOR WIRING
AND PINOUT (PAGE 16)
2
CENTRAL ECU X2
CONNECTOR WIRING
AND PINOUT (PAGE 15)
4
CENTRAL ECU X5
CONNECTOR WIRING
AND PINOUT (PAGE 17)
CENTRAL GSBC-EBS-ECU
TOWING VEHICLE
30 31
N/C
N/C
9
10
11
ALS1_GND
ALS1_HSS
ALS1_SIG
N/C
12
ALS2_SIG
N/C
13
SWUP(I/O)
7
8
15
16
GND1
GND2
UB1
UB2
20A
20A
14
UZ-PLC_Line
PCV
WHL1
2
1
3
1
2
3
PCV_Wheel1_GND
PCV_Wheel1_HSS_OV
PCV_Wheel1_HSS_IV
PCV
WHL2
2
1
3
4
5
6
PCV_Wheel2_GND
PCV_Wheel2_HSS_OV
PCV_Wheel2_HSS_IV
PLC
X1
1
2
3
X1
N/C
5
eTPCM_HSS
eTPCM_LSS_OV
eTPCM_LSS_IV
eTPCM_LSS_BV
eTPCM_Sensor_SPL
eTPCM_Sensor_SIG
eTPCM_Sensor_GND
6
9
8
7
15
14
16
Trailer_CAN_H
Trailer_CAN_L
17
18
EPM2_GND
EPM2_HSS
EPM2_CAN_H
EPM2_CAN_L
1
2
10
11
EPM3_GND
EPM3_HSS
EPM3_CAN_H
EPM3_CAN_L
4
3
12
13
X2
1
2
3
4
5
6
7
8
1
1
2
3
4
5
6
7
8
9
2
1
3
4
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
4
X5
10
11
12
13
14
15
16
17
18
SENS_SPL4
SENS_GND4
SENS_CAN_H
SENS_CAN_L
X5
VEHICLE_CAN_H
VEHICLE_CAN_L
CAN_Shield
CHASSIS_CAN_H
CHASSIS_CAN_L
14
15
16
5
6
EPM1_GND
EPM1_HSS
EPM1_CAN_H
EPM1_CAN_L
4
3
12
13
EPM0_GND
EPM0_HSS
EPM0_CAN_H
EPM0_CAN_L
1
2
10
11
IO/FAIL_IN_TRL
7
FBM_SPL
FBM_GND
FBM_SIG1
FBM_SIG2
9
8
17
18
X3
14
13
4
3
2
1
12
11
10
9
LWS2_GND
LWS2_S
LWS2_SPL
WSS 1
1
2
1
2
WSS1_LO
WSS1_HI
WSS 2
1
2
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
18
17
16
15
14
13
12
11
10
1
WSS2_HI
WSS2_LO
1C EPM – ADD2
X1
EPM_GND
EPM_SPL
CAN_BRAKE_HI
CAN_BRAKE_LO
11
10
4
LWS1_GND
LWS1_S
LWS1_SPL
LWS1 R
3
1
2
3
9
5
LWS2_GND
LWS2_S
LWS2_SPL
WSS 1
1
2
1
2
WSS1_HI
WSS1_LO
WSS 2
1
2
X2
7
8
X2
CAN CHASSIS
X1
N/C
WSS2_HI
WSS2_LO
2
1
3
4
X3
FBM
4
1
2
3
1
3
4
2
X1
LWS1_GND
LWS1_S
LWS1_SPL
LWS1 R
3
1
2
3
9
5
LWS2_GND
LWS2_S
LWS2_SPL
WSS 1
1
2
1
2
WSS1_HI
WSS1_LO
WSS 2
1
2
X2
1
3
2
1
2
3
4
5
4
7
8
X2
WSS2_HI
WSS2_LO
LWS3 L
3
1
2
11
10
4
LWS3_GND
LWS3_S
LWS3_SPL
LWS4 R
3
1
2
3
9
5
LWS4_GND
LWS4_S
LWS4_SPL
WSS 3
1
2
1
2
WSS3_HI
WSS3_LO
WSS 4
1
2
X3
7
8
X3
WSS4_HI
WSS4_LO
X2
X1
X2
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TSB/Document ID: SD-27-5023V_002
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System: Brakes
MFR Component Subsystem: ABS & ESC
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