Toyota 4Runner manuals

Toyota 4Runner: Downhill Assist Control Indicator Light does not Come ON

DESCRIPTION

Even if the downhill assist control switch is pressed, the downhill assist control indicator light blinks and downhill assist control does not activate under the following conditions:

  • The transfer is in H4.
  • The brake system is malfunctioning.
  • The temperature of the hydraulic brake booster increases and downhill assist control is temporarily canceled.

WIRING DIAGRAM


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.

(c) Turn the ignition switch to ON.

(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.


NG

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

OK

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


Result

Result

Proceed to

DTC is not output

A

DTC is output

B


B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

3.

INSPECT DOWNHILL ASSIST CONTROL SWITCH

(a) Remove the downhill assist control switch (See page ).


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (E) - 4 (+B2)

Not pushed in

10 kΩ or higher

Pushed in

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Downhill Assist Control Switch)



NG

REPLACE DOWNHILL ASSIST CONTROL SWITCH

OK

4.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU HDCS CIRCUIT)

(a) Disconnect the A6 skid control ECU connector.

(b) Disconnect the U4 downhill assist control switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A6-44 (HDCS) - U4-4 (+B2)

Always

Below 1 Ω

A6-44 (HDCS) - Body ground

Always

10 kΩ or higher

U4-1 (E) - Body ground

Always

Below 1 Ω


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

READ VALUE USING TECHSTREAM (DOWNHILL ASSIST CONTROL LIGHT)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Downhill Assist Control Light

Downhill assist control indicator light/ ON or OFF

ON: Indicator light on

OFF: Indicator light off

-

(f) When performing the Downhill Assist Control Light Active Test, check Downhill Assist Control Light in the Data List (See page
).

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Downhill Assist Control Light

Downhill assist control indicator light

Indicator light ON/OFF

Observe the combination meter.

Result

Result

Proceed to

Data List Display

Data List Display when Performing Active Test ON/OFF Operation

ON

Does not change between ON and OFF

A

Changes between ON and OFF

B

OFF

Does not change between ON and OFF

A

Changes between ON and OFF

B


A

REPLACE MASTER CYLINDER SOLENOID


B

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

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