Acura CSX. Manual — part 400
SNR9AC7D52100000000HBAT01
Symptom
Diagnostic procedure
19-105
Symptom Troubleshooting Index
When the vehicle has one of these symptoms, check for VSA diagnostic trouble codes (DTCs) with the HDS. If there
are no DTCs, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.
HDS does not communicate with the VSA modulator-
control unit or the vehicle
Troubleshoot the DLC circuit (see page 11-204).
VSA activation indicator does not come on at start-up
(bulb check)
1.
2.
Do the gauge control module troubleshooting
(see page 22-241).
Substitute a known-good VSA modulator-control unit,
then recheck. If it is OK, replace the original VSA
modulator-control unit (see page 19-171).
VSA activation indicator does not go off, and no DTCs
are stored
1.
2.
Symptom Troubleshooting (see page 19-165).
Substitute a known-good VSA modulator-control unit,
then recheck. If it is OK, replace the original VSA
modulator-control unit (see page 19-171).
ABS indicator, brake system indicator, and VSA
indicator do not come on
1.
2.
Do the gauge control module troubleshooting
(see page 22-241).
Substitute a known-good VSA modulator-control unit,
then recheck. If it is OK, replace the original VSA
modulator-control unit (see page 19-171).
ABS indicator, brake system indicator, and VSA
indicator do not go off
1.
2.
3.
Check for F-CAN DTCs, and troubleshoot and repair
those first.
Do the gauge control module troubleshooting
(see page 22-241).
Symptom Troubleshooting (see page 19-166).
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SNR9AC7D52100000000CAAT00
VSA Modulator-Control Unit Inputs and Outputs for 37P Connector (Connector Disconnected)
Terminal
number
Wire color
Terminal
sign
Description
Signal
19-106
VSA System Components
System Description
NOTE: Standard battery voltage is about 12 V.
1
RED
CAN-L
F-CAN communication circuit
3
BLU
STR-D
Detects steering angle sensor
signal
6
PNK
FR-GND
Detects right-front wheel speed
sensor signal
7
ORN
SVCC
Power source for the steering
angle sensor
With ignition switch ON (II): about 5.0 V
8
PUR
RL-GND
Detects left-rear wheel speed
sensor signal
9
LT GRN
RR
B
Detects right-rear wheel speed
sensor signal
10
BRN
SGND
Ground for the steering angle
sensor
11
RED
FL-GND
Detects left-front wheel speed
sensor signal
13
WHT
FSR
B
Power source for the fail-safe
relay
Battery voltage at all times
14
RED
MR
B
Power source for the motor
relay
Battery voltage at all times
Wire side of female terminals
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Terminal
number
Wire color
Terminal
sign
Description
Signal
19-107
NOTE: Standard battery voltage is about 12 V.
15
WHT
CAN-H
F-CAN communication circuit
17
PUR
STR-B
Detects steering angle sensor
signal
19
GRN
FR
B
Detects right-front wheel speed
sensor signal
20
YEL
RL
B
Detects left-rear wheel speed
sensor signal
21
BLU
RR-GND
Detects right-rear wheel speed
sensor signal
22
WHT
FL
B
Detects left-front wheel speed
sensor signal
26
LT BLU
K-LINE
Communication with HDS
28
GRY
IG1
Power source for activating the
system
With ignition switch ON (II): about battery
voltage
34
GRN
STR-A
Detects steering angle sensor
signal
36
BLK
GND
Ground for the VSA modulator-
control unit
Continuity to ground
37
BLK
MR-GND
Ground for the pump motor
Continuity to ground
08/08/21 15:04:53 61SNR030_190_0107
*01
System Outline
19-108
VSA System Components
CONTROL UNIT
MODULATOR UNIT
VSA MODULATOR-
CONTROL UNIT
Brake pressure
signal
• Solenoid control
• Motor control
Communication via F-CAN
VSA
OFF
SWITCH
PARKING
BRAKE
SWITCH
BRAKE
FLUID
LEVEL
SWITCH
WHEEL SPEED SENSOR
• Engine torque control request
• Control mode signal
• VSA control enable/disable
• Throttle open angle signal
• Engine revolution signal
• Brake pedal
position switch signal
• Service check signal
• Gear position signal
Wheel rotation
pulse signal
ECM/PCM
BRAKE
PEDAL
POSITION
SWITCH
GAUGE CONTROL MODULE (TACH)
YAW RATE-LATERAL
ACCELERATION
SENSOR
STEERING ANGLE
SENSOR
• VSA OFF switch signal
• Parking brake switch signal
• Brake fluid level switch signal
• Yaw rate signal
• Lateral acceleration signal
Steering angle signal
• Indicator drive signal
• Buzzer request signal*
*: ’09 model
This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, the
yaw rate-lateral acceleration sensor, and the system indicators in the gauge control module (tach). The VSA
modulator-control unit controls the ABS, EBD, TCS, VSA, and brake assist with the brake pressure of each wheel and
reduces engine torque.
08/08/21 15:04:53 61SNR030_190_0108
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