Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Illumination Circuit

DESCRIPTION

Power is supplied to the navigation receiver assembly and steering pad switch assembly illumination when the light control switch is in the TAIL or HEAD position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 precautionary notice for the Supplemental Restraint System (See page Inspect the fuses for circuits related to this system before performing ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK ILLUMINATION

(a) Check if the illumination for the navigation receiver assembly, steering pad switch, heater control switch or others (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the TAIL or HEAD position.

Result

Result

Proceed to

Illumination comes on for all components except steering pad switch assembly

A

Illumination comes on for all components except navigation receiver assembly

B

Illumination comes on for all components except steering pad switch assembly and navigation receiver assembly

C

B

GO TO STEP 6

C

GO TO STEP 7

A

2.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - BATTERY)

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S8-13 (IL+2) - Body ground

Light control switch in the tail or head position

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Spiral Cable with Sensor Sub-assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly (See page (b) Inspect the steering pad switch assembly (See page (b) Inspect the steering pad switch assembly (See page ).

(b) Inspect the steering pad switch assembly (See page ).

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly (See page (b) Inspect the spiral cable with sensor sub-assembly (See page ).

(b) Inspect the spiral cable with sensor sub-assembly (See page ).

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the S8 spiral cable with sensor sub-assembly connector.

(b) Disconnect the N25 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N25-23 (SWG) - S8-3 (EAU)

Always

Below 1 Ω

N25-23 (SWG) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - BATTERY)

(a) Disconnect the navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

N24-10 (ILL+) - Body ground

Light control switch in the tail or head position

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Navigation Receiver Assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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

(a) Disconnect the N23 navigation receiver assembly connector.

(b) Disconnect the C9 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N23-5 (ILL-) - C9-15 (ILL-)

Always

Below 1 Ω

N23-5 (ILL-) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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