Lexus SC300 / Lexus SC400. Service manual — part 266

Location of Connectors in Body

BR–92

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BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

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BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–93

DTC

11, 12 ABS Solenoid Relay Circuit

CIRCUIT DESCRIPTION

This relay supplies power to each ABS solenoid. After the ignition switch is turned on, if the initial check is OK,
the relay goes on.

DTC No.

DTC Detecting Condition

Trouble Area

11

Conditions (1) and (2) continue for 0.2 sec. or more:

(1) ABS solenoid relay (SR) terminal

voltage: Battery

positive voltage

(2) Solenoid relay monitor (AST) terminal voltage: 0V

ABS solenoid relay

Open or short in ABS solenoid relay circuit

ECU

12

Conditions (1) and (2) continue for 0.2 sec. or more:

(1) ABS solenoid relay (SR) terminal voltage: 0V

(2) Solenoid relay monitor (AST) terminal voltage: Bat-

tery positive voltage

ABS solenoid relay

B+ short in ABS solenoid relay circuit

ECU

Fail safe function: If trouble occurs in the solenoid relay circuit, the ECU cuts off current to the solenoid

relay and prohibits ABS control.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

BR–94

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BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

WIRING DIAGRAM

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BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–95