| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000001900P |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier; 2018 - 2020 MY Sienna [11/2017 - ] | ||
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Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier |
DESCRIPTION
This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assembly is functioning normally, no sound or only an extremely faint sound can be heard.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC is stored.
- The radio and display receiver assembly may not operate normally.
PROCEDURE
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1. |
INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY |
|
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
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![2018 MY Sienna [11/2017 - 08/2018]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PROBLEM SYMPTOMS TABLE](/t3Portal/stylegraphics/info.gif)
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2. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
(a) Disconnect the D195 radio and display receiver assembly connector.
(b) Disconnect the L56 stereo component amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D195-25 (MUT1) - L56-1 (MUTE) |
Always |
Below 1 Ω |
|
D195-25 (MUT1) or L56-1 (MUTE) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL) |
(a) Reconnect the L56 stereo component amplifier assembly connector.
(b) Disconnect the D195 radio and display receiver assembly connector.
|
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK |
|
| NG |
|
|
|