Lexus RX300 (MCU15). Service manual - part 254

F13427

Battery

GAUGE

Combination 
Meter ECU

1

8

7

R

J8
J/C

B

4

Skid Control ECU

Y–B

Fusible
Link Block

24

14

A23

2

R–B

Multiplex
Communication
Circuit

2

R

B

B

G–W

G–W

3A

1

*1 : LHD
*2 : RHD

R–B

R–L

C

1G

R–L

Instrument Panel J/B

MPX2

E9

3

IG1

AM1

Engine and 
ECT ECU

P

9

E6

E6

IH1

P

G–W

PL

RL

J8
J/C

C

C

R–B

IH1

IH1

20

R–B

(*2)

C

C

R–B

(*2)

J19
J/C

R–B (*1)

15

A23

10

HEATER

1K

13

R–W

R–W

3E

5

3H

9

3E

10

W–B

IH

R–W

C12

W–B

P

R

22 21

W–R

18

Engine and 
ECT ECU

B–Y

1C

Ignition
Switch

W–L

6

1C

1

1A

1

2

AM1

W

5

3

2

J/B No. 3

Instrument Panel J/B

N1 A/T
Indicator
Switch

ALT

1

C

DI–248

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300   (RM785E)

WIRING DIAGRAM

F13411

3

2

1

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–249

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

Check neutral start switch (Park/Reverse range switch circuit).

PREPARATION:
(a)

Jack up the vehicle.

(b)

Disconnect the connector from the neutral start switch.

CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.
OK:

P range switch

Terminals 3 – 1

Continuity

R range switch

Terminals 3 – 2

Continuity

NG

Replace neutral start switch.

OK

2

Check for open and short circuit in harness and connector between terminals P
and R of skid control ECU and engine and ECT ECU connector and battery (See
page IN–32).

NG

Repair or replace harness or connector.

OK

Check and replace skid control ECU or en-
gine and ECT ECU.

F09210

Yaw Rate Sensor

YD

GYAW

YAW2

VYS

3

1

5

4

(Shielded)

R–W

B

R–L

W–R

5

17

16

15

9

IM1

(Shielded)

Skid Control ECU

18

27

28

9

19

A23 YSS

YD

GYAW

YAW

VYS

IM1

IM1

IM1

IM1

R–W

B

R–L

W–R

A23

A23

A23

A23

DI–250

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300   (RM785E)

DTC

C1210 / 36

Zero Point Calibration of Yaw Rate
Sensor Undone

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

C1210 / 36

After battery terminal was connected, when the shift lever

was moved other than to P range within 15 sec. soon after

ECU terminal IG1 become ON for the first time.

S Yaw rate sensor

S Yaw rate sensor circuit

S P range switch circuit

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check if zero point calibration of yaw rate sensor has done or not.

Obtains the zero point calibration of the yaw rate sensor (See page DI–205).
CHECK:
Check that the VSC indicator light comes on and the both indicators go off after 15 seconds.

YES

No problem.

NO

DI1H2–06

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–251

LEXUS RX300   (RM785E)

2

Check for open and short circuit in harness and connector between P range
switch and skid control ECU and engine and ECT ECU (See page IN–32).

NG

Repair or replace harness or connector.

OK

3

Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN–32).

NG

Repair or replace harness or connector.

OK

4

Check yaw rate sensor (See page DI–260).

NG

Replace yaw rate sensor assembly.

OK

Check and replace skid control ECU.