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

Toyota Tacoma (2015-2018) Service Manual: 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

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.

(c) Turn the Techstream 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

-
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
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

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 ).

NG

REPLACE BLIND SPOT MONITOR MAIN SWITCH ASSEMBLY

OK

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)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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.

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

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
OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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