Lexus NX: Main Switch Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

CHECK BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

(a) Check that the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly) illuminates normally when the blind spot monitor main switch (combination switch assembly) is turned from off to on.

(b) Check that the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly) turns off normally when the blind spot monitor main switch (combination switch assembly) is turned from on to off.

OK:

The blind spot monitor indicator operates normally.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

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

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

Click here

Body Electrical > Blind Spot Monitor Master > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Main Switch

State of the blind spot monitor main switch (combination switch assembly)

OFF or ON

OFF: Blind spot monitor main switch (combination switch assembly) off

ON: Blind spot monitor main switch (combination switch assembly) on

-

Main Switch Indicator Status

State of the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly)

OFF or ON

OFF: Indicator not illuminated

ON: Indicator illuminated

-

Body Electrical > Blind Spot Monitor Master > Data List

Tester Display

Main Switch

Main Switch Indicator Status

Result

Proceed to

The status of "Main Switch" and "Main Switch Indicator Status" change as shown above when the blind spot monitor main switch (combination switch assembly) is operated.

A

The status of "Main Switch" does not change as shown above when the blind spot monitor main switch (combination switch assembly) is operated.

B

The status of "Main Switch Indicator Status" changes as shown above when the blind spot monitor main switch (combination switch assembly) is operated.

C

A

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

C

GO TO STEP 6

B

3.

CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BATTERY)

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

*a

Front view of wire harness connector

(to Blind Spot Monitor Main Switch [Combination Switch Assembly])

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I33-5 (B) - Body ground

Power switch on (IG)

11 to 14 V

I33-5 (B) - Body ground

Power switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

(a) Remove the blind spot monitor main switch (combination switch assembly).

Click here

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

Click here

NG

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

OK

5.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR MAIN SWITCH [COMBINATION SWITCH ASSEMBLY] - BLIND SPOT MONITOR SENSOR LH)

(a) Disconnect the V1 blind spot monitor sensor LH connector.

(b) Disconnect the I33 blind spot monitor main switch (combination switch assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V1-8 (BSSW) - I33-15 (D)

Always

Below 1 Ω

V1-8 (BSSW) - Body ground

Always

10 kΩ or higher

OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

(a) Remove the blind spot monitor main switch (combination switch assembly).

Click here

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

Click here

NG

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY)

OK

7.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR MAIN SWITCH [COMBINATION SWITCH ASSEMBLY] - BLIND SPOT MONITOR SENSOR LH)

(a) Disconnect the V1 blind spot monitor sensor LH connector.

(b) Disconnect the I33 blind spot monitor main switch (combination switch assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V1-3 (BIND) - I33-11 (E)

Always

Below 1 Ω

V1-3 (BIND) - 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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