Toyota Corolla Cross: Microphone Circuit Open (B157213)
DESCRIPTION
This DTC is stored when the DCM (telematics transceiver) detects a malfunction in the telephone microphone assembly circuit.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B157213 |
Microphone Circuit Open |
Current at terminal MCVD is lower than the malfunction threshold for 10 seconds or more while the ignition switch is ON |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System.
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PROCEDURE
|
1. |
CHECK DTC |
(a) Turn the ignition switch to ON and wait for 10 seconds or more.
(b) Clear the DTCs.
Body Electrical > Telematics > Clear DTCs(c) Check for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble CodesOK:
No DTCs are output.
| OK | .gif)
|
USE SIMULATION METHOD TO CHECK |
|
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|
2. |
CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the I200 DCM (telematics transceiver) connector.
(b) Disconnect the T30 telephone Microphone Assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I200-5 (MCVD) - T30-1 (MAC1) |
Always |
Below 1 Ω |
|
I200-6 (MCI+) - T30-2 (MO1+) |
Always |
Below 1 Ω |
|
I200-7 (MCI-) - T30-4 (MO1-) |
Always |
Below 1 Ω |
|
I200-23 (SGND) - Body ground |
Always |
10 kΩ or higher |
|
I200-5 (MCVD) or T30-1 (MAC1) - Body ground |
Always |
10 kΩ or higher |
|
I200-6 (MCI+) or T30-2 (MO1+) - Body ground |
Always |
10 kΩ or higher |
|
I200-7 (MCI-) or T30-4 (MO1-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE) |
|
(a) Remove the telephone microphone assembly but do not disconnect the connectors. Click here |
|
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
T30-1 (MAC1) - Body ground |
Ignition switch ON |
4 to 6 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T30-4 (MO1-) - Body ground |
Always |
Below 1 Ω |
| OK |
|
REPLACE TELEPHONE MICROPHONE ASSEMBLY |
|
|
4. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver) with a new one.
Click here
NOTICE:
- The ignition switch must be off.
- Do not exchange the DCM (telematics transceiver) with one from another vehicle.
| NEXT |
|
PERFORM DCM ACTIVATION |
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Installation
INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION)
Procedure Part Name Code
1 FRONT EXHAUST PIPE ASSEMBLY
17410
- -
2 NO. 2 AIR FUEL RATIO SENSOR
89467B -
- -
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