Toyota Tacoma 2015-2018 Service Manual: Illumination Circuit

Toyota Tacoma 2015-2018 Service Manual / Audio / Video / Audio And Visual System / Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display 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

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 the following inspection procedure.

PROCEDURE

1.	CHECK ILLUMINATION

(a) Check if the illumination for the radio and display 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 radio and display receiver assembly.	B
Illumination comes on for all components except steering pad switch assembly and radio and display receiver assembly.	C

GO TO STEP 6

GO TO STEP 7

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)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 ).

REPLACE STEERING PAD SWITCH ASSEMBLY

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 ).

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY AND BODY GROUND)

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

(b) Disconnect the R31 radio and display receiver assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S8-3 (EAU) - R31-23 (SWG)	Always	Below 1 Ω
S8-3 (EAU) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - BATTERY)

(a) Disconnect the radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
R30-10 (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 Radio and Display Receiver Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the R29 radio and display receiver assembly connector.

(b) Disconnect the C9 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R29-5 (ILL-) - C9-15 (ILL-)	Always	Below 1 Ω
R29-5 (ILL-) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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