Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026PMS |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 - 11/2022] |
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): B157213; Microphone Circuit Open; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022] |
DTC
|
B157213
|
Microphone Circuit Open
|
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 engine switch is on (IG)
|
-
DCM (telematics transceiver)
-
Telephone microphone assembly LH*1
-
Map light assembly*2
-
Telephone microphone assembly*2
-
Harness or connector
|
*1: for TMC Made
*2: for TMMMS Made
WIRING DIAGRAM
for TMC Made
for TMMMS Made
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.
Click here
PROCEDURE
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and wait for 10 seconds or more.
(d) Turn the Techstream on.
(e) Clear the DTCs.
Body Electrical > Telematics > Clear DTCs
(f) Check for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble Codes
OK:
No DTCs are output.
NG
|
|
|
(a) Choose the model to be inspected.
Result
|
Proceed to
|
for TMC Made
|
A
|
for TMMMS Made
|
B
|
A
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - TELEPHONE MICROPHONE ASSEMBLY LH)
|
(a) Disconnect the I143 telematics transceiver connector.
(b) Disconnect the T24 telephone microphone assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I143-5 (MCVD) - T24-1 (MAC1)
|
Always
|
Below 1 Ω
|
I143-6 (MCI+) - T24-2 (MO1+)
|
Always
|
Below 1 Ω
|
I143-7 (MCI-) - T24-4 (MO1-)
|
Always
|
Below 1 Ω
|
I143-23 (SGND) - Body ground
|
Always
|
10 kΩ or higher
|
I143-5 (MCVD) or T24-1 (MAC1) - Body ground
|
Always
|
10 kΩ or higher
|
I143-6 (MCI+) or T24-2 (MO1+) - Body ground
|
Always
|
10 kΩ or higher
|
I143-7 (MCI-) or T24-4 (MO1-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
4.
|
CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY LH POWER SOURCE)
|
(a) Remove the telephone microphone assembly LH 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
|
T24-1 (MAC1) - Body ground
|
Engine switch on (IG)
|
7.5 to 8.5 V
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
T24-4 (MO1-) - Body ground
|
Always
|
Below 1 Ω
|
|
|
*a
|
Component with harness connected
(Telephone Microphone Assembly LH)
|
|
|
NG
|
|
|
5.
|
REPLACE DCM (TELEMATICS TRANSCEIVER)
|
(a) Replace the DCM (telematics transceiver) with a new one.
Click here
NOTICE:
-
The engine switch must be off.
-
Do not exchange the DCM (telematics transceiver) with one from another vehicle.
6.
|
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY)
|
(a) Disconnect the I143 DCM (telematics transceiver) connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I143-5 (MCVD) - T6-7 (MACC)
|
Always
|
Below 1 Ω
|
I143-6 (MCI+) - T6-6 (MCO+)
|
Always
|
Below 1 Ω
|
I143-7 (MCI-) - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
I143-23 (SGND) - Body ground
|
Always
|
10 kΩ or higher
|
I143-5 (MCVD) or T6-7 (MACC) - Body ground
|
Always
|
10 kΩ or higher
|
I143-6 (MCI+) or T6-6 (MCO+) - Body ground
|
Always
|
10 kΩ or higher
|
I143-7 (MCI-) or T6-5 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
7.
|
CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)
|
(a) Remove the map light assembly but do not disconnect the connectors.
Click here
|
|
*a
|
Component with harness connected
(Map Light Assembly)
|
|
|
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
T6-7 (MACC) - Body ground
|
Engine switch on (IG)
|
4 to 6 V
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
T6-5 (MCO-) - Body ground
|
Always
|
Below 1 Ω
|
|