Lexus ES300 (2002 year). Manual - part 351

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-203

356

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

SGR (A22 - 17) - GND (A22 -

14)

GR-B 

↔

 W-B

Always

Continuity (

Ω

)

SBR (A22 - 18) - GND (A22 -

14)

LG-R 

↔

 W-B

IG switch ON

4.5 - 5.5

Ts (A22 - 19) - GND (A22 -

LG B

W B

IG switch ON and terminals Ts - CG connected

Below 1.0

Ts (A22   19)   GND (A22 

14)

LG-B 

↔

W-B

IG switch ON and terminals Ts - CG not connected

10 - 14

SW2 (A22 - 20) - GND (A22 -

14)

V 

↔

 W-B

IG switch ON and absorber control switch ”SEMI-COMFORT”

or ”SEMI-SPORT”

0

SW1 (A22 - 21) - GND (A22 -

14)

Y 

↔

 W-B

IG switch ON and absorber control switch ”SEMI-COMFORT”

or ”SEMI-SPORT”

0

MOD2 (A22 - 23) - GND (A22

- 14)

W-B 

↔

 W-B

IG switch ON

Continuity (

Ω

)

FRO (A22 - 25) - GND (A22 -

14)

GR-R 

↔

 W-B

Vehicle speed 20 km/h (12 mph) or higher

Pulse generation

RAR+ (A22 - 26) - RAR- (A22

- 12)

L-R 

↔

 R-W

IG switch ON

Continuity (

Ω

)

056AA-01

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

357

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

PROBLEM SYMPTOMS TABLE

If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

Symptom

Inspection Circuit

See page

Damping force control does not operate at all

1. Absorber control actuator circuit

2. Ts terminal circuit

3. Shock absorber

4. Absorber control ECU

05-210

05-232

26-8
27-4

01-31

Only anti-roll control does not operate

1. Steering angle sensor circuit

2. Right front speed sensor circuit

3. Absorber control ECU

05-219

05-217

01-31

Only anti-squat control does not operate

1. Crankshaft position sensor circuit

2. Right front speed sensor circuit

3. Absorber control ECU

05-222

05-217

01-31

Only anti-dive control does not operate

1. Stop light switch circuit

2. Right front speed sensor circuit

3. Absorber control ECU

05-224

05-217

01-31

Only semi-active control does not operate

1. Right front speed sensor circuit

2. Absorber control ECU

05-217

01-31

Only speed sensing control does not operate

1. Right front speed sensor circuit

2. Absorber control ECU

05-217

01-31

Only unsprung damping control does not operate

1. Right front speed sensor circuit

2. Absorber control ECU

05-217

01-31

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

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358

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C1715/15 RIGHT FRONT ACCELERATION SENSOR

CIRCUIT

DTC

C1716/16 LEFT FRONT ACCELERATION SENSOR

CIRCUIT

DTC

C1717/17 REAR ACCELERATION SENSOR CIRCUIT

DTC

C1791/91 RIGHT FRONT ACCELERATION SENSOR

CIRCUIT

DTC

C1792/92 LEFT FRONT ACCELERATION SENSOR

CIRCUIT

DTC

C1793/93 REAR ACCELERATION SENSOR CIRCUIT

CIRCUIT DESCRIPTION

The acceleration sensor (assy) detect the up-and-down acceleration of the vehicle. The acceleration sen-
sor (assy) 3 in total are mounted in the absorber control ECU, at the forward of the glove compartment door
at the instrument panel safety pad position and in the rear luggage, and detect the up-and down acceleration
of the vehicle, respectively. The acceleration sensor (assy) convert the resistance into electrical signal and
output to the absorber control ECU.

DTC No.

DTC Detecting Condition

Trouble Area

C1715/15
C1791/91

Right front acceleration sensor assy

Right front acceleration sensor circuit

Absorber control ECU

C1716/16
C1792/92

Acceleration sensor signal is fixed to 0 V or 5 V

Absorber control ECU
(Left front acceleration sensor is a built-in equipment)

C1717/17
C1793/93

Rear acceleration sensor

Rear acceleration sensor circuit

Absorber control ECU

HINT:

DTC No. C1715/15 and C1791/91 is the right front acceleration sensor assy.

DTC No. C1716/16 and C1792/92 is the left front acceleration sensor (left front acceleration sensor
is a built-in equipment).

DTC No. C1717/17 and C1793/93 is the rear acceleration sensor.

056AB-01

F41647

SGFL

SBL

SGL

A22

4

5

3

O

V-Y

B-R

IF4

2

1

GL1

VGS

GGND

Absorber Control ECU

A24 
Right Front 
Acceleration Sensor

A22

A22

O

V-Y

B-R

IF4

IF4

5

3

3

2

A40 
Rear Acceleration
Sensor

GL1

VGS

GGND

1

3

2

P-L

LG-R

GR-B

IO5

IF2

16

14

15

IO5

IO5

3

1

2

P-L

LG-R

GR-B

IF2

IF2

P-L

LG-R

GR-B

A22

A22

A22

16

18

17

SGRR

SBR

SGR

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

359

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

WIRING DIAGRAM