Toyota Tacoma 2015-2018 Service Manual: Crawl Indicator Light Remains ON

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Crawl Indicator Light Remains ON

DESCRIPTION

When CRAWL starts after operating the CRAWL switch (drive monitor switch), the CRAWL indicator light turns on. While CRAWL is in the process of stopping, the CRAWL indicator light begins blinking. When CRAWL totally stops, the CRAWL indicator light turns off.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page ).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(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: OK: ).

OK:

CAN Bus Check indicates no malfunctions in CAN communication.

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

2.	INSPECT SKID CONTROL ECU (TRS TERMINAL)

(a) Disconnect the S1 skid control ECU (master cylinder solenoid) connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
S1-43 (TRS) - Body ground	CRAWL switch not pushed in	10 kΩ or higher
S1-43 (TRS) - Body ground	CRAWL switch pushed in	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU (Master Cylinder Solenoid))

GO TO STEP 4

3.	READ VALUE USING TECHSTREAM (CRAWL CONTROL LIGHT)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(f) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Crawl Control Light	Crawl indicator light/ ON or OFF	ON: Indicator light on OFF: Indicator light off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Crawl Control Light

Crawl indicator light/ ON or OFF

ON: Indicator light on

OFF: Indicator light off

(g) Check the Techstream display condition of the brake warning light.

Result

Result	Proceed to
Display of the Data List remains OFF	A
Display of the Data List remains ON	B

GO TO METER / GAUGE SYSTEM

REPLACE MASTER CYLINDER SOLENOID

4.	INSPECT DRIVE MONITOR SWITCH

(a) Remove the crawl control switch (drive monitor switch) (See page (b) Inspect the crawl control switch (drive monitor switch) (See page ).

(b) Inspect the crawl control switch (drive monitor switch) (See page ).

REPLACE DRIVE MONITOR SWITCH

5.	INSPECT ROOF CONSOLE BOX ASSEMBLY

(a) Remove the roof console box assembly.

for Double Cab: (See page )
for Access Cab: (See page )

Text in Illustration

Component without harness connected

(Roof Console Box Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R44-1 (SWI3) - 2	Always	Below 1 Ω
R44-3 (DN) - 7	Always	Below 1 Ω
R44-4 (ECU) - 6	Always	Below 1 Ω
R44-5 (UP) - 3	Always	Below 1 Ω
R44-12 (GND) - 5	Always	Below 1 Ω

Result

Result	Proceed to
OK	A
NG (for Double Cab)	B
NG (for Access Cab)	C

REPAIR OR REPLACE HARNESS OR CONNECTOR (MASTER CYLINDER SOLENOID - ROOF CONSOLE BOX ASSEMBLY)

REPLACE ROOF CONSOLE BOX ASSEMBLY

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