- Radio and display receiver assembly
- Microphone Amplifier Assembly
- Harness or connector
- DCM (telematics transceiver) (w/ Manual [SOS] Switch)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018F7I |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - 08/2018] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: B1579; Voice Recognition Microphone Disconnected; 2018 MY Sienna [11/2017 - 08/2018] | ||
|
DTC |
B1579 |
Voice Recognition Microphone Disconnected |
DESCRIPTION
The radio and display receiver assembly and 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
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 occurs:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
-
Before replacing the DCM (telematics transceiver), refer to Registration.
Click here
![2018 - 2020 MY Sienna [11/2017 - ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: DCM ACTIVATION](/t3Portal/stylegraphics/info.gif)
HINT:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.
Refer to Precaution for Audio and Visual System.
Click here
PROCEDURE
|
1. |
CHECK VEHICLE TYPE |
(a) Check the vehicle type.
|
Result |
Proceed to |
|---|---|
|
w/ Manual (SOS) Switch |
A |
|
w/o Manual (SOS) Switch |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MICROPHONE AMPLIFIER ASSEMBLY) |
(a) Disconnect the D196 radio and display receiver assembly connector.
(b) Disconnect the T29 microphone amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D196-25 (SNS2) - T29-4 (SNS2) |
Always |
Below 1 Ω |
|
D196-25 (SNS2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MICROPHONE AMPLIFIER ASSEMBLY) |
(a) Disconnect the D73 DCM (telematics transceiver) connector.
(b) Disconnect the T29 microphone amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D73-35 (MCI-) - T29-3 (MIC-) |
Always |
Below 1 Ω |
|
D73-35 (MCI-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER]) |
(a) Disconnect the D196 radio and display receiver assembly connector.
(b) Disconnect the D73 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D196-22 (MIN-) - D73-19 (MCO-) |
Always |
Below 1 Ω |
|
D196-22 (MIN-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK DCM (TELEMATICS TRANSCEIVER) (MCI-) |
|
(a) Remove the DCM (telematics transceiver) with the connector(s) still connected. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D73-35 (MCI-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
6. |
INSPECT MICROPHONE AMPLIFIER ASSEMBLY (SNS2, MCO-) |
(a) Remove the microphone amplifier assembly.
Click here
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK |
|
| NG |
|
|
7. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MICROPHONE AMPLIFIER ASSEMBLY) |
(a) Disconnect the D196 radio and display receiver assembly connector.
(b) Disconnect the T29 microphone amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D196-25 (SNS2) - T29-4 (SNS2) |
Always |
Below 1 Ω |
|
D196-22 (MIN-) - T29-3 (MIC-) |
Always |
Below 1 Ω |
|
D196-25 (SNS2) - Body ground |
Always |
10 kΩ or higher |
|
D196-22 (MIN-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
INSPECT MICROPHONE AMPLIFIER ASSEMBLY (SNS2, MCO-) |
(a) Remove the microphone amplifier assembly.
Click here
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK |
|
| NG |
|
|
|