Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJ44
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Steering Pad Switch Circuit; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.

Therefore, the radio and display receiver assembly cannot be operated using the steering pad switch assembly, and the radio and display receiver assembly itself cannot function.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS (See page 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: PRECAUTION ).

PROCEDURE

1.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; AUDIO / VIDEO: STEERING PAD SWITCH: REMOVAL ).

(b) Inspect the steering pad switch assembly (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; AUDIO / VIDEO: STEERING PAD SWITCH: INSPECTION ).

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

2.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL ).

(b) Inspect the spiral cable with sensor sub-assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSPECTION ).

Result

Result

Proceed to

OK (w/o Steering Heater)

A

OK (w/ Steering Heater)

B

NG

C

B

GO TO STEP 4

C

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

A

3.

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

(a) Disconnect the D155 radio and display receiver assembly connector.

(b) Disconnect the D21 spiral cable with sensor sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D155-21 (SW1) - D21-6 (AU1)

Always

Below 1 Ω

D155-22 (SW2) - D21-5 (AU2)

Always

Below 1 Ω

D155-24 (SW3) - D21-3 (AU3)*1

Always

Below 1 Ω

D155-23 (SWG) - D21-4 (EAU)

Always

Below 1 Ω

D155-21 (SW1) - Body ground

Always

10 kΩ or higher

D155-22 (SW2) - Body ground

Always

10 kΩ or higher

D155-24 (SW3) - Body ground*1

Always

10 kΩ or higher

D155-23 (SWG) - Body ground

Always

10 kΩ or higher

  • *1: for 4 Speakers
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 MY Sienna [08/2016 - 11/2017]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PROBLEM SYMPTOMS TABLE )

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

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

(a) Disconnect the D155 radio and display receiver assembly connector.

(b) Disconnect the D149 spiral cable with sensor sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D155-21 (SW1) - D149-6 (AU1)

Always

Below 1 Ω

D155-22 (SE2) - D149-5 (AU2)

Always

Below 1 Ω

D155-23 (SWG) - D149-4 (EAU)

Always

Below 1 Ω

D155-21 (SW1) - Body ground

Always

10 kΩ or higher

D155-22 (SW2) - Body ground

Always

10 kΩ or higher

D155-23 (SWG) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 MY Sienna [08/2016 - 11/2017]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PROBLEM SYMPTOMS TABLE )

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR