Lexus RX300 (MCU15). Manual — part 266

F02192

1

2

(+)

(–)

DI–296

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300 (RM785E)

INSPECTION PROCEDURE

HINT:
Start inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not using
the hand–held tester.

1

Check operation of the VSC buzzer.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON, and push the hand–held tester main switch ON.

(c)

Select the ACTIVE TEST mode on the hand–held tester.

CHECK:
Check that VSC buzzer sounds ”ON” and ”OFF” with the hand–held tester.

OK

Check and replace skid control ECU.

NG

2

Check VSC buzzer.

PREPARATION:
Disconnect the VSC buzzer connector.
CHECK:
Apply battery voltage to the terminals 1 and 2 of VSC buzzer
connector, check that the VSC buzzer sounds.

NG

Replace VSC buzzer.

OK

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–297

LEXUS RX300 (RM785E)

3

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

NG

Repair or replace harness or connector.

OK

Check and replace skid control ECU.

F13437

Skid Control ECU

J/B No. 5

A22 Tc

3

13

CG

Tc

DLC3

IF

W–B

5C

4

4

W–B

P–B

12

5C

11

5B

5B

3

DI–298

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300 (RM785E)

Tc Terminal Circuit

CIRCUIT DESCRIPTION

Connecting terminals Tc and CG of the DLC3 causes the ECU to display the DTC by flashing the ABS warn-
ing light and VSC warning light.

WIRING DIAGRAM

DI0X4–11

F09678

ON

DLC3

Tc

CG

(+)

(–)

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–299

LEXUS RX300 (RM785E)

INSPECTION PROCEDURE

1

Check voltage between terminals Tc and CG of the DLC3.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal Tc and CG of DLC3.
OK:

Voltage: 10 – 14 V

OK

If ABS warning light and VSC warning light does
not blink even after Tc and CG have been con-
nected, the ECU may be defective.

NG

2

With ignition switch OFF, check for open and short circuit in harness and con-
nector between skid control ECU and DLC3, DLC3 and body ground (See page
IN–32).

NG

Repair or replace harness or connector.

OK

Check and replace skid control ECU.