Toyota Tacoma (2015-2018) Service Manual: Main Switch Circuit

Toyota Tacoma (2015-2018) Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Main Switch Circuit

DESCRIPTION

When the blind spot monitor main switch assembly (warning canceling switch assembly) is turned on, a signal is sent to the blind spot monitor sensor LH. The blind spot monitor system operates according to this signal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (MAIN SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Blind Spot Monitor Master / Data List.

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

Blind Spot Monitor Master

Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Main SW	Blind spot monitor main switch assembly / OFF or ON	ON: Blind spot monitor main switch assembly on OFF: Blind spot monitor main switch assembly off	-

Techstream Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Main SW

Blind spot monitor main switch assembly / OFF or ON

ON: Blind spot monitor main switch assembly on

OFF: Blind spot monitor main switch assembly off

Result

Result	Proceed to
The display changes as shown above when the blind spot monitor main switch assembly is operated.	A
The display does not change as shown above when the blind spot monitor main switch assembly is operated.	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT BLIND SPOT MONITOR MAIN SWITCH ASSEMBLY

(a) Remove the blind spot monitor main switch assembly (See page (b) Inspect the blind spot monitor main switch assembly (See page ).

(b) Inspect the blind spot monitor main switch assembly (See page ).

REPLACE BLIND SPOT MONITOR MAIN SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR MAIN SWITCH ASSEMBLY - BATTERY)

(a) Disconnect the blind spot monitor main switch assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
B7-4 (B) - Body ground	Ignition switch ON	11 to 14 V
B7-4 (B) - Body ground	Ignition switch off	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to Blind Spot Monitor Main Switch Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR MAIN SWITCH ASSEMBLY - BLIND SPOT MONITOR SENSOR LH)

(a) Disconnect the B12 blind spot monitor sensor LH connector.

(b) Disconnect the B7 blind spot monitor main switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
B12-8 (BSSW) - B7-1 (D)	Always	Below 1 Ω
B12-8 (BSSW) - Body ground	Always	10 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Power Source Circuit

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