Toyota 4Runner: Downhill Assist Control Indicator Light Remains ON

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Downhill Assist Control Indicator Light Remains ON

DESCRIPTION

When the downhill assist control switch is turned on, the downhill assist control function is available and the downhill assist control indicator light illuminates.

WIRING DIAGRAM

Refer to Downhill Assist Control Indicator Light does not Come ON (See page ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).

PROCEDURE

1.	CHECK CAN COMMUNICATION LINE

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (See page ).

OK:

CAN Bus Check indicates no malfunctions in CAN communication.

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	INSPECT DOWNHILL ASSIST CONTROL SWITCH

REPLACE DOWNHILL ASSIST CONTROL SWITCH

3.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU HDCS CIRCUIT)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	READ VALUE USING TECHSTREAM (DOWNHILL ASSIST CONTROL LIGHT)

REPLACE MASTER CYLINDER SOLENOID

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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