- Radio and display receiver assembly
- Roof console box assembly
- Microphone amplifier assembly
- Harness or connector
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJ54 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: B1579; Voice Recognition Microphone Disconnected; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
B1579 |
Voice Recognition Microphone Disconnected |
DESCRIPTION
The radio and display receiver assembly and roof console box assembly (microphone amplifier assembly) are connected to each other using the microphone connection detection signal lines.
This DTC is stored when a microphone connection detection signal line is disconnected.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1579 |
Telephone microphone signal is lost. |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
D155-4 (MACC) - Body ground |
Ignition switch ACC |
4 to 6 V |
Text in Illustration
|
*a |
Component with harness connected (Radio and Display Receiver Assembly) |
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY) |
(a) Disconnect the D155 radio and display receiver assembly connector.
(b) Disconnect the T29 roof console box assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D155-4 (MACC) - T29-1(MACC) |
Always |
Below 1 Ω |
|
D155-5 (MIN+) - T29-2 (MIC+) |
Always |
Below 1 Ω |
|
D155-19 (MIN-) - T29-3 (MIC-) |
Always |
Below 1 Ω |
|
D155-6 (SNS2) - T29-4 (SGN2) |
Always |
Below 1 Ω |
|
D155-4 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
D155-5 (MIN+) - Body ground |
Always |
10 kΩ or higher |
|
D155-19 (MIN-) - Body ground |
Always |
10 kΩ or higher |
|
D155-18 (SGND) - Body ground |
Always |
10 kΩ or higher |
|
D155 -6 (SNS2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK MICROPHONE AMPLIFIER ASSEMBLY |
(a) Replace the microphone amplifier assembly with a known good one (See page
![2016 - 2018 MY Sienna [12/2015 - 08/2018]; AUDIO / VIDEO: MICROPHONE AMPLIFIER: REMOVAL](/t3Portal/stylegraphics/info.gif)
).
(b) Clear the DTCs (See page
).
(c) Check for DTCs (See page
).
OK:
No DTCs are output.
| OK |
|
END (MICROPHONE AMPLIFIER ASSEMBLY WAS DEFECTIVE) |
| NG |
|
|
|