Toyota CH-R Service Manual: Illumination Circuit

DESCRIPTION

Power is supplied to the radio 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 precaution for Supplemental Restraint System.

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

PROCEDURE

1.

CHECK ILLUMINATION

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

Result

Proceed to

Illumination comes on for all components except steering pad switch assembly.

A

Illumination comes on for all components except radio receiver assembly.

B

No illumination comes on (radio receiver assembly, hazard switch, heater control switch, etc.).

C

B

GO TO STEP 5

C

GO TO LIGHTING SYSTEM

A

2.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(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

Condition

Specified Condition

F29-13 (IL+2) - Body ground

Light control switch in tail or head position

11 to 14 V

*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.

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(b) Inspect the steering pad switch assembly.

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(c) Check that the steering pad switch assembly illumination illuminates.

OK:

The steering pad switch assembly illumination illuminates.

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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

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

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NOTICE:

  • Press and hold the lock located in the center of the spiral cable with sensor sub-assembly to rotate the spiral cable with sensor sub-assembly.
  • The spiral cable with sensor sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable with sensor sub-assembly may prevent the airbag from deploying.
  • As the spiral cable with sensor sub-assembly may break, do not rotate the spiral cable with sensor sub-assembly more than the specified amount.
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - RADIO RECEIVER ASSEMBLY - BODY GROUND)

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

5.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the radio receiver assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F48-10 (ILL+) - Body ground

Light control switch in tail or head position

11 to 14 V

*a

Front view of wire harness connector

(to Radio Receiver Assembly)

OK

REPLACE RADIO RECEIVER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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