| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018F8R |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Illumination Circuit; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
Illumination Circuit |
DESCRIPTION
Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the headlight dimmer switch assembly is in the tail or head position.
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)
).
NOTICE:
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 and display receiver assembly, steering pad switch assembly, glove box or other parts (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the head or tail 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 |
|
No illumination comes on (radio and display receiver assembly, hazard switch, glove box, etc.) |
C |
|
Illumination comes on for all components except steering pad switch assembly and radio and display receiver assembly |
D |
| B |
|
| C |
|
| D |
|
|
|
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 |
|---|---|---|
|
D21-8 (IL+2) - Body ground*1 |
Headlight dimmer switch assembly tail or head |
11 to 14 V |
|
D149-9 (IL+2) - Body ground*2 |
Headlight dimmer switch assembly tail or head |
11 to 14 V |
- *1: w/o Steering Heater
- *2: w/ Steering Heater
| NG |
|
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
).
| OK |
|
| NG |
|
|
4. |
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 |
|---|---|---|
|
D196-15 (ILL+) - Body ground |
Headlight dimmer switch assembly tail or head |
11 to 14 V |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the D196 radio and display receiver assembly connector.
(b) Disconnect the D145 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D196-16 (ILL-) - D145-12 (ILL-) |
Always |
Below 1 Ω |
|
D196-16 (ILL-) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|