Lexus NX: Illumination Circuit

DESCRIPTION

Power is supplied to the radio receiver assembly and steering pad switch assembly when the light control switch is in the tail or head position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE

1.

CHECK METER / GAUGE SYSTEM

(a) Check if the rheostat function operates normally.

OK:

The rheostat function operates normally.

NG

GO TO METER / GAUGE SYSTEM

OK

2.

CHECK LIGHTING SYSTEM (INT)

(a) Check if the instrument panel illumination comes on normally.

OK:

The instrument panel illumination comes on normally.

NG

GO TO LIGHTING SYSTEM (INT)

OK

3.

CHECK ILLUMINATION

(a) Check if the illumination for the steering pad switch assembly or radio receiver assembly comes on when the light control switch is turned to the head or tail position.

Result

Proceed to

Illumination for steering pad switch assembly does not come on.

A

Illumination for radio receiver assembly does not come on.

B

B

GO TO STEP 7

A

4.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT)

(a) Disconnect the spiral cable sub-assembly connector.

*a

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I4-13 (IL+2) - Body ground

Power switch on (IG)

Light control switch in the tail or head position

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

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(b) Inspect the steering pad switch assembly.

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NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

6.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

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(b) Inspect the spiral cable sub-assembly.

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OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

7.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT)

(a) Disconnect the radio receiver assembly connector.

*a

Front view of wire harness connector

(to Radio Receiver Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I152-15 (ILL+) - Body ground

Power switch on (IG)

Light control switch in tail or head position

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the I152 radio receiver assembly connector.

(b) Disconnect the I10 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I152-16 (ILL-) - I10-39 (ILL-)

Always

Below 1 Ω

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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INSPECTION PROCEDURE 1. INSPECT TILT AND TELESCOPIC SWITCH (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition 1 (VC) - 3 (MSW) Tilt up 342 to 378 Ω Tilt down 1890.5 to 2089.5

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