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Last Modified: 11-27-2007 1.6 J
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: LX570 Doc ID: RM000001DXY00PX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570)

Brake Warning Light does not Come ON

DESCRIPTION

The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 LX570) .

PROCEDURE

1.

INSPECT BRAKE WARNING LIGHT

(a) Disconnect the A24 skid control ECU connector.

(b) Turn the engine switch on (IG).

(c) Check that the brake warning light comes on.

OK:

Brake warning light comes on.

OK

2.

CHECK CAN COMMUNICATION LINE

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Select "CAN Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

OK:

"CAN Bus Check" indicates no malfunctions in CAN communication.

OK

3.

CHECK DTC (for CAN Communication System)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Check for DTCs NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING (2008 LX570) .

Result

Result

Proceed to

CAN system DTC is not output.

A

CAN system DTC is output.

B
A

4.

CHECK OPERATION OF BRAKE WARNING LIGHT (ACTIVE TEST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Check the condition of the brake warning light by operating the Techstream.

Combination Meter

Tester Display

Test Part

Control Range

Diagnostic Note

Indicat. Lamp Brake

Brake Warning Light

Warning light ON/OFF

-

OK:

The warning light turns on when operating the Techstream.

OK