Toyota Venza: Illumination Circuit

Toyota Venza Service Manual / Navigation / Multi Info Display / Navigation System / 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

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 (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 navigation 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 navigation receiver assembly.	B
Illumination comes on only for steering pad switch assembly.	C
No illumination comes on (navigation receiver assembly, hazard switch, heater control switch, etc.).	D

GO TO STEP 5

GO TO METER / GAUGE SYSTEM

GO TO LIGHTING SYSTEM

2.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the D18 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
D18-12 (IL+2) - Body ground	Light control switch in tail or head position	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEERING PAD SWITCH ASSEMBLY

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

(b) Connect a battery positive (+) lead to terminal 5 (IL+2) and a negative (-) lead to terminal 3 (-DP) of the steering pad switch assembly connector.

Text in Illustration

Component without harness connected

(Steering Pad Switch Assembly)

OK:

Illumination for the steering pad switch assembly comes on.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-5 (IL+2) - D18-12 (IL+2)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right
z5-3 (-DP) - D18-10 (-DP)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right

(c) After setting the spiral cable with sensor sub-assembly to the center position, rotate the spiral cable with sensor sub-assembly 2.5 times clockwise. Then while rotating the spiral cable with sensor sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-5 (IL+2) - D18-12 (IL+2)	Always	3 Ω or less
z5-3 (-DP) - D18-10 (-DP)	Always	3 Ω or less

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.

Text in Illustration

Component without harness connected

(Spiral Cable with Sensor Sub-assembly)

Steering Pad Switch Assembly Side

Vehicle Side

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

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the E38 navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
E38-10 (ILL+) - Body ground	Light control switch in tail or head position	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the E39 navigation receiver assembly connector.

(b) Disconnect the E2 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E39-5 (ILL-) - E2-12 (ILL-)	Always	Below 1 Ω
E39-5 (ILL-) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Black Screen

PROCEDURE 1. CHECK DISPLAY SETTING (a) Check that the display is not in screen off mode. OK: The display setting is not in screen off mode. NG ...

Steering Pad Switch Circuit

DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the navigation receiver assembly. If there is an open in the circuit, the audio system cannot be operate ...

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