Lexus SC300 / Lexus SC400. Service manual — part 259

BR0F0–04

ABS ACTUATOR DISASSEMBLY AND
ASSEMBLY

Remove and install the parts, as shown.

COMPONENTS

BR–64

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

ABS ACTUATOR INSPECTION

BR0F1–03

HINT: Using the ABS actuator checker (SST), check the op-
eration of the actuator. If the actuator does not operate,
check the operation of sub–wire harness G according to
instructions on pages BR–97 and BR101. If the solenoid and/
or pump motor relay are abnormal, replace the relay and in-
spect the actuator operation again.

w/o TRAC:

1.

INSPECT BATTERY POSITIVE VOLTAGE

Battery positive voltage:

10–14V

2.

DISCONNECT CONNECTORS FROM ACTUATOR
Disconnect the 2 connectors from the actuator.

3.

CONNECT ACTUATOR CHECKER (SST) TO ACTUATOR

(a) Connect the actuator checker (SST) to the actuator side wire

harnesses via the sub–wire harnesses (SST), as shown.
SST 09990–00150, 09990–00210, 09990–00250 and

09990–00280

(b) Connect the red cable of the checker to the battery positive

(+) terminal and the black cable to negative (–) terminal.
Connect the black cable of the sub–wire harnesses to the
battery negative (–) terminal or body ground.

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–65

4.

INSPECT BRAKE ACTUATOR OPERATION

(a) Start the engine, and run it at idle speed.
(b) Turn the MAIN selector switch of the actuator checker to the

“FRONT RH” position.

(c) Push and hold in the SUB MOTOR switch for a few seconds.
(d) Depress the brake pedal and hold it until step (g) is

completed.

(e) Push the MAIN push switch and check that the brake pedal

can not be depressed.

NOTICE: Do not keep the MAIN push switch pushing more

than 10 seconds.

(f) Release the switch, and check that the pedal can be

depressed.

(g) Push and hold in the SUB MOTOR switch for a few seconds,

and check that the pedal returns.

(h) Release the brake pedal.

(i)

Push and hold in the SUB MOTOR switch for a few seconds.

(j) Depress

the brake pedal and hold it for about 15 seconds. As

you hold the pedal down, push the SUB MOTOR switch for
a few seconds. Check that the brake pedal does not pulsate.

5.

INSPECT FOR OTHER WHEELS

(a) Turn the MAIN selector switch to the “FRONT LH” position.
(b) Repeat (c) to (j) of step 4, checking the actuator operation in

the same way.

(c) Also, inspect the “REAR” positions following the same

procedure.

BR–66

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

6.

PUSH SUB MOTOR SWITCH
Push and hold in the SUB MOTOR switch for a few seconds.

7. DISCONNECT

ACTUATOR

CHECKER

(SST)

FROM

ACTUATOR

(a) Disconnect the actuator checker (SST) and sub–wire

harnesses (SST) from the actuator.
SST 09990–00150, 09990–00210, 09990–00250 and

09990–00280

(b) Connect the actuator connectors.
(c) Clear the diagnostic trouble codes.

(See page

BR–77

)

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–67