Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM100000001KLFE |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [09/2019 - 04/2020] |
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model with Dual Knob Type): B1579; Voice Recognition Microphone Disconnected; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020] |
DTC
|
B1579
|
Voice Recognition Microphone Disconnected
|
DESCRIPTION
The radio and display receiver assembly, map light assembly and telephone microphone 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 No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
B1579
|
Voice Recognition Microphone Disconnected
|
Microphone signal is lost
|
-
Map light assembly
-
Telephone microphone assembly
-
Radio and display receiver assembly
-
DCM (telematics transceiver)*
-
Harness or connector
|
-
*: w/ Manual (SOS) Switch
WIRING DIAGRAM
for Hatchback Model
for Sedan Model
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 Audio and Visual System.
Click here
-
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 occur:
-
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
PROCEDURE
1.
|
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I56-22 (MIN-) - Body ground
|
Always
|
Below 1 Ω
|
Result:
Result
|
Proceed to
|
OK (w/o Manual (SOS) Switch)
|
A
|
OK (for Hatchback Model with Manual (SOS) Switch)
|
B
|
OK (for Sedan Model with Manual (SOS) Switch)
|
C
|
NG
|
D
|
|
|
*a
|
Component with harness connected
(Radio and Display Receiver Assembly)
|
|
|
A
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
|
(a) Disconnect the I56 radio and display receiver assembly 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
|
I56-25 (SNS2) - T6-4 (SNS2)
|
Always
|
Below 1 Ω
|
I56-22 (MIN-) - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground
|
Always
|
10 kΩ or higher
|
I56-22 (MIN-) or T6-5 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
3.
|
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
|
I143-7 (MCI-) - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
I143-7 (MCI-) or T6-5 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
4.
|
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))
|
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the I143 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I56-22 (MIN-) - I143-32 (MCO-)
|
Always
|
Below 1 Ω
|
I56-22 (MIN-) or I143-32 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
5.
|
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
|
(a) Disconnect the I56 radio and display receiver assembly 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
|
I56-25 (SNS2) - T6-4 (SNS2)
|
Always
|
Below 1 Ω
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
6.
|
INSPECT DCM (TELEMATICS TRANSCEIVER)
|
(a) Connect the I143 DCM (telematics transceiver) connector.
(b) Connect the I56 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I143-7 (MCI-) - Body ground
|
Always
|
Below 1 Ω
|
|
|
*a
|
Component with harness connected
(DCM (Telematics Transceiver))
|
|
|
OK
|
|
|
7.
|
INSPECT MAP LIGHT ASSEMBLY
|
(a) Remove the map light assembly.
Click here
(b) Connect the B telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
4 (SNS2) - 5 (MCO-)
|
Always
|
Below 1 Ω
|
|
|
*a
|
Component without harness connected
(Map Light Assembly)
|
|
|
NG
|
|
|
8.
|
INSPECT MAP LIGHT ASSEMBLY
|
(a) Remove the map light assembly.
Click here
(b) Disconnect the B telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
B-1 - T6-4 (SNS2)
|
Always
|
Below 1 Ω
|
B-2 - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
B-1 or T6-4 (SNS2) - T6-11 (GND)
|
Always
|
10 kΩ or higher
|
B-2 or T6-5 (MCO-) - T6-11 (GND)
|
Always
|
10 kΩ or higher
|
|
|
*a
|
Component without harness connected
(Map Light Assembly (No. 1 Roof Wire Side))
|
*b
|
Component without harness connected
(Map Light Assembly (Telephone Microphone Assembly Side))
|
|
|
9.
|
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY)
|
(a) Disconnect the I72 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
|
I72-35 (MCI-) - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
I72-35 (MCI-) or T6-5 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
10.
|
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))
|
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the I72 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I56-22 (MIN-) - I72-19 (MCO-)
|
Always
|
Below 1 Ω
|
I56-22 (MIN-) or I72-19 (MCO-) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
11.
|
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
|
(a) Disconnect the I56 radio and display receiver assembly 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
|
I56-25 (SNS2) - T6-4 (SNS2)
|
Always
|
Below 1 Ω
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
12.
|
INSPECT DCM (TELEMATICS TRANSCEIVER)
|
(a) Connect the I72 DCM (telematics transceiver) connector.
(b) Connect the I56 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I72-35 (MCI-) - Body ground
|
Always
|
Below 1 Ω
|
|
|
*a
|
Component with harness connected
(DCM (Telematics Transceiver))
|
|
|
OK
|
|
|
13.
|
INSPECT MAP LIGHT ASSEMBLY
|
(a) Remove the map light assembly.
Click here
(b) Connect the B telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
4 (SNS2) - 5 (MCO-)
|
Always
|
Below 1 Ω
|
|
|
*a
|
Component without harness connected
(Map Light Assembly)
|
|
|
NG
|
|
|
14.
|
INSPECT MAP LIGHT ASSEMBLY
|
(a) Remove the map light assembly.
Click here
(b) Disconnect the B telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
B-1 - T6-4 (SNS2)
|
Always
|
Below 1 Ω
|
B-2 - T6-5 (MCO-)
|
Always
|
Below 1 Ω
|
B-1 or T6-4 (SNS2) - T6-11 (GND)
|
Always
|
10 kΩ or higher
|
B-2 or T6-5 (MCO-) - T6-11 (GND)
|
Always
|
10 kΩ or higher
|
|
|
*a
|
Component without harness connected
(Map Light Assembly (No. 1 Roof Wire Side))
|
*b
|
Component without harness connected
(Map Light Assembly (Telephone Microphone Assembly Side))
|
|
|
|