Acura RL (1996-2004 year). Instruction — page 53

+

35-3

Traction Control System (TCS) (’96-’99)

‘96-‘97

C201

PHOTO 112
VIEW 71

C215

PHOTO 53

POWERTRAIN
CONTROL
MODULE
(PCM)

PHOTO 104
VIEW 115

TCS
CONTROL
UNIT

PHOTO 151
VIEW 107

(

*

6)

2

)

BRN

1

(

*

7)

3

)

GRN/BLU

2

ABS
CONTROL
UNIT

PHOTO 111
VIEW 111

LEFT
FRONT
WHEEL
SENSOR

PHOTO 58

BRN

BLK

BLK

GRN/BLU

C326

PHOTO 73
VIEW 72

C309

PHOTO 30

(BARO)

Barometric pressure
sensor input

Right front wheel
sensor input

(FRP)

(VREF)

Voltage
reference input

Left front wheel
sensor input

(FLP)

(TC-STB)

Traction control
standby input

Right rear wheel
sensor input

(RRP)

(TC-INH)

Traction control
inhibit input

Left rear wheel
sensor input

(RLP)

Speed sensor inputs

Barometric
sensor output
signal

(BARO OUT)

Voltage
reference

(VREF)

Traction
control
standby

(TCSTB)

Traction
control
inhibit

(TCINH)

(FRP)

Right front wheel
sensor output

(FLP)

Left front wheel
sensor output

(RRP)

Right rear wheel
sensor output

(RLP)

Left rear wheel
sensor output

A

(B

*

)

20

)

(

*

15)

GRY/BLK

C444

PHOTO 108
VIEW 93

7

GRY/BLK

A

5

18

)

(

*

13)

GRY/WHT

3

GRY/WHT

7

6

)

(

*

5)

WHT/GRN

5

WHT/GRN

1

4

)

(

*

3)

WHT/RED

6

WHT/RED

3

A

8

C444

PHOTO 108
VIEW 93

4

LT GRN/RED

C

9

10

13

PNK/BLK

12

12

11

BLU/WHT

20

13

1

GRN/ORN

3

D

4

3

(

*

8)

4

)

GRN

1

(

*

9)

5

)

GRN/BLK

2

RIGHT
FRONT
WHEEL
SENSOR

PHOTO 58

GRN

BLK

BLK

GRN/BLK

17

18

(

*

18)

14

)

GRY

1

(

*

17)

13

)

LT BLU

2

LEFT
REAR
WHEEL
SENSOR

PHOTO 59

GRY

BLK

BLK

LT BLU

C724

PHOTO 68

3

4

11

12

(

*

20)

16

)

BLU/YEL

1

(

*

19)

15

)

GRN/YEL

2

RIGHT
REAR
WHEEL
SENSOR

PHOTO 59

BLU/YEL

BLK

BLK

GRN/YEL

C669

PHOTO 152
VIEW 40

C725

PHOTO 68

1

2

C413

PHOTO 83
VIEW 73

9

10

LT GRN/RED

PNK/BLK

BLU/WHT

GRN/ORN

4

GRN/

BLK

ABS INSPECTION
CONNECTOR

PHOTO 100
VIEW 7

1

GRN/

BLU

5

GRN/

YEL

2

LT

BLU

GRN/BLU

GRN/BLK

LT BLU

GRN/YEL

GRY

LT BLU

BLU/YEL

GRN/YEL

B

B

(FLW (-))

(FLW (+))

(FRW (–))

(FRW (+))

(RLW (–))

(RLW (+))

(RRW (–))

(RRW (+))

*

= ‘98-‘99

2004 American Honda Motor Co., Inc.

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How the Circuit Works

How the Circuit Works

35-4

Traction Control System (TCS) (’96-’99)

How the Circuit Works

The traction control system is a variable system that
monitors the amount of wheel spin under different
driving conditions. During straight line acceleration,
the TCS control unit may determine that some
wheel spin is beneficial. During cornering, it may
determine to reduce wheel spin by adjusting engine
power and braking. The system is not designed to
correct for gross errors of judgment on the part of
the driver.

The TCS control unit communicates with the ABS
control unit to obtain information from the wheel
speed sensors about wheel speed and frequency of
wheel rotational vibration. The wheel rotational
vibration is used by the TCS control unit to signal
the powertrain control module (PCM) to reduce
engine power under certain rough road conditions.
The TCS control unit also communicates with the
PCM to monitor A/T gear position, throttle
position, engine rpm, atmospheric pressure, and
“TCS inhibit” information.

The TCS control unit also monitors input from the
steering angle sensor. When you turn the steering
wheel, the steering angle sensor sends a signal to
the TCS control unit which reads it as a specific
cornering radius. The TCS control unit also
determines the straight ahead position by
comparing the front wheel speed inputs from the
ABS control unit. When the left front and right front
wheels are rotating at the same speed, the car is
moving in a straight line. The TCS control unit
determines the yaw angle by comparing the actual
cornering radius provided by the wheel speed
sensor inputs to the steering angle. If required, the
control unit will signal the TCS control valve
actuator and the PCM to reduce engine power and
slow the car down to maintain the cornering radius
set by the steering angle sensor when you turned
the wheel.

The TCS control unit is a self-diagnosing component
and monitors the sensors for irregular signals.

Refer to the Service Manual (Section 19, Brakes)
for testing and troubleshooting procedures.

2004 American Honda Motor Co., Inc.

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36

Vehicle Stability Assist (VSA) System

VSA OFF
SWITCH

VIEW 18

See Power
Distribution,
page 10-7.

See Ground
Distribution,
pages 14
and 14-1.

See Ground
Distribution,
page 14-5.

See Power
Distribution,
page 10-8.

BRN/WHT

BRN/WHT

BLK/WHT

BLK/WHT

FUSE 19

R/C MIRROR
7.5A

C402

PHOTO 77
VIEW 37

2

5

YEL/BLK

UNDER-
DASH
FUSE/
RELAY
BOX

PHOTO 75

27

WHT/BLK

C414

PHOTO 83
VIEW 91

13

WHT/BLK

G251

PHOTO 46

See Power Distribution,
page 10-7.

FUSE 20

ECU
20A

C405

PHOTO 74
VIEW 60

2

26

16

BLK/YEL

BLK/YEL

See Power
Distribution,
page 10-8.

FUSE 42

(TCS)
15A

C306

PHOTO 36
VIEW 36

5

BLU/RED

(STM (+))

3

(STM (–))

4

Shield

(SLD)

GRN

BRN

BLK

3

2

C105

PHOTO 49
VIEW 23

1

BLK

BLK

GRN

BRN

TCS control valve
actuator driver

1

2

C122

PHOTO 5

YEL

GRY

M

(IG1)

Power
source

SUB-
THROTTLE
MOTOR
FAIL-SAFE
RELAY

PHOTO 26

UNDER-
HOOD
RELAY
BOX C

PHOTO 23

12

(STM FSR)

Fail-safe
relay driver

14

(TB-STM)

TCS control
valve actuator
power source

9

C326

PHOTO 73
VIEW 72

10

See Power
Distribution,
page 10-9.

3

1

5

2

10

(IG2)

Power
source

G101

PHOTO 10

1

13

BRN/BLK

BRN/BLK

BRN/BLK

BRN/BLK

(LG1)

(LG2)

Logic circuit ground

VSA
CONVERTER
UNIT

PHOTO 183
VIEW 128

See Ground
Distribution,
page 14-13.

15

G404

PHOTO 106

BLK

VSA control
unit ground

(GND)

BLK

BLK

See Ground
Distribution,
page 14-11.

1

G401

PHOTO 79

Pump
motor
ground

(M-GND)

BLK

VSA
MODULATOR/
CONTROL
UNIT

PHOTO 182
VIEW 127

C504

PHOTO 83
VIEW 68

16

WHT/BLK

(VSA OFF SW)

VSA switch
input

4

RED

2

23

YEL/

BLK

(IG2)

Power
source

C502

PHOTO 77
VIEW 83

1

BLK/

YEL

BLK/

YEL

See Power
Distribution,
page 10-9.

See Dash
and Console
Lights

3

RED/BLK

1

See Dash
and Console
Lights

VSA
SWITCH
LIGHT

C456
(Terminals 7-10)

PHOTO 103
VIEW 81

YEL/BLK

BLK/YEL

BLK/YEL

BLK/YEL

YEL/BLK

Ground

(STM GND)

VSA
CONTROL
VALVE
ACTUATOR

PHOTO 5

HOT IN ON

HOT AT ALL TIMES

HOT IN ON OR START

’00-’04

2004 American Honda Motor Co., Inc.

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+

36-1

Vehicle Stability Assist (VSA) System

’00-’04

BRAKE FLUID
LEVEL SWITCH
Closed with
low fluid level

PHOTO 39

See Brake System
Indicator Light,
page 71-2.

GRN/WHT

C476

PHOTO
97
VIEW 94

See Brake System
Indicator Light,
page 71-2.

NOTE: The Gauge Relay is energized with the Ignition Switch in ON (II) or START (III). See Gauge Assembly,
page

80-5

.

See Ground
Distribution,
page 14-7.

See Power Distribution,
page 10-18.

WHT/YEL

WHT/YEL

See Gauge Assembly,
page 80-5 or 80-9.

WHT/RED

WHT/RED

FUSE 55

METER
15A

C307

PHOTO 37
VIEW 47

1

RED/YEL

GAUGE
RELAY

PHOTO 27

UNDER-HOOD
RELAY BOX C

PHOTO 23

1

2

FUSE 39

STOP
HORN
20A

C301

PHOTO 36

5

BRAKE PEDAL
POSITION SWITCH
Closed with
pedal pressed

PHOTO 81

4

3

UNDER-HOOD
FUSE/RELAY
BOX

PHOTO 33

C464
(Terminals
14-16)

PHOTO 103
VIEW 82

GRN/WHT

GRN/WHT

GRN/WHT

YEL/BLU

C504

PHOTO 83
VIEW 68

14

BLU/WHT

C476

PHOTO 97
VIEW 94

3

LT GRN/

RED

C477

PHOTO 97
VIEW 29

4

)

(’00-’03

3)

BLK

C321

PHOTO
39

G301

PHOTO 31

BLK

BLK

C322

PHOTO 39

GRN/

RED

GRN/WHT

BLK

(VSA)

VSA
indicator
driver

33

(STOP)

Brake
input

32

See
Cruise
Control

GRN/WHT

See Automatic
Transmission
Controls,
Wiper/Washer

GRN/

WHT

See Brake
Lights

GRN/

WHT

GRN/WHT

GRN/RED

PARKING
BRAKE
SWITCH
Closed
with
parking
brake
applied

PHOTO 81

GRN/RED

GRN/RED

(PARK)

Parking
brake
input

38

GRN/RED

G401

PHOTO 79

See Ground
Distribution,
page 14-11.

BLK

BLU/WHT

LT GRN/

RED

(ABS)

ABS
indicator
driver

17

(INFO)

VSA
activation
indicator
driver

7

YEL/BLU

C414

PHOTO 83
VIEW 91

8

YEL/BLU

GRY

(EBD)

Brake
system
indicator
driver

18

14

GRY

GRN/RED

(BFL)

Brake
fluid
level
input

36

GRN/WHT

VSA
MODULATOR/
CONTROL
UNIT

PHOTO 182
VIEW 127

From page 36-6 or 36-7

To page
36-6 (’00-’03)
or 36-7 (’04)

HOT AT ALL TIMES

2004 American Honda Motor Co., Inc.

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