- Wire harness or connector
- Telephone microphone assembly
- Roof console box assembly
- DCM (Telematics Transceiver)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJC7 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2018] |
| Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B1572; Telephone Microphone Error; 2016 - 2018 MY Sienna [12/2015 - 08/2018] | ||
|
DTC |
B1572 |
Telephone Microphone Error |
DESCRIPTION
This DTC is set when the DCM (Telematics Transceiver) detects a malfunction in the telephone microphone assembly circuit.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1572 |
Current of MCVD reaches malfunction criteria for 10 seconds while ignition switch is ON. |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK DTC |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON and wait for 10 seconds.
(d) Turn the Techstream on.
(e) Perform "HEALTH CHECK" and check for current DTCs (See page
![2016 - 2017 MY Sienna [12/2015 - 11/2017]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK](/t3Portal/stylegraphics/info.gif)
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1572 is output |
A |
|
DTC B1572 is not output |
B |
| B |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
|
|
2. |
INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE POWER SOURCE) |
|
(a) Remove the roof console box assembly but do not disconnect the connectors (See page
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
T29-1 (MACC) - Body Ground |
Ignition switch ACC |
4 to 6 V |
Text in Illustration
|
*1 |
Component with harness connected (Roof Console Box Assembly) |
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (DCM - ROOF CONSOLE BOX) |
|
(a) Disconnect the D73 DCM (Telematics Transceiver) 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 |
|---|---|---|
|
D73-34 (MCI+) - T29-2 (MIC+) |
Always |
Below 1 Ω |
|
D73-35 (MCI-) - T29-3 (MIC-) |
Always |
Below 1 Ω |
|
D73-34 (MCI+) - Body Ground |
Always |
10 kΩ or higher |
|
D73-35 (MCI-) - Body Ground |
Always |
10 kΩ or higher |
|
D73-32 (SGND) - Body Ground |
Always |
10 kΩ or higher |
Text in Illustration
|
*1 |
Front view of wire harness connector (to DCM (Telematics Transceiver)) |
|
*2 |
Front view of wire harness connector (to Roof Console Box Assembly) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
REPLACE TELEPHONE MICROPHONE ASSEMBLY |
(a) Replace the telephone microphone assembly with a normal one and check if the same problem occurs again.
OK:
The system returns to normal.
| OK |
|
END |
| NG |
|
|
5. |
INSPECT DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE POWER SOURCE) |
|
(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors (See page
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
D73-33 (MCVD) - Body Ground |
Ignition switch ACC |
4 to 6 V |
Text in Illustration
|
*1 |
Component with harness connected (DCM (Telematics Transceiver)) |
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (Telematics Transceiver) (See page
).
NOTICE:
- The ignition switch must be off.
- Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
| NEXT |
|
PERFORM DCM ACTIVATION (See page
|
|
|