| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018F8Q |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Steering Pad Switch Circuit; 2018 - 2020 MY Sienna [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](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) |
(a) Disconnect the D195 radio and display receiver assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D195-21 (SW1) - D195-24 (SWG) |
No switch pushed |
95 to 105 kΩ |
|
Seek+ switch pushed |
Below 2.5 Ω |
|
|
Seek- switch pushed |
313 to 345 Ω |
|
|
Volume+ switch pushed |
950 to 1050 Ω |
|
|
Volume- switch pushed |
2955 to 3265 Ω |
|
|
D195-22 (SW2) - D195-24 (SWG) |
No switch pushed |
95 to 105 kΩ |
|
MODE switch pushed |
Below 2.5 Ω |
|
|
On/off hook switch pushed |
950 to 1050 Ω |
|
|
Voice switch pushed |
2955 to 3265 Ω |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
|
|
|
2. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly (See page
).
(b) Inspect the steering pad switch assembly (See page
).
| NG |
|
|
|
3. |
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
).
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NG |
|
|
|