Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001KLFG
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): B15DB; Telematics Transceiver Disconnected; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]

DTC

B15DB

Telematics Transceiver Disconnected

DESCRIPTION

If the radio and display receiver assembly cannot detect the DCM (telematics transceiver) for a certain period of time (90 seconds) after the ignition switch is turned to ACC and the radio and display receiver assembly confirms that the information is missing by checking past DCM (telematics transceiver) recognition information (registered information), this DTC will be stored.

The telematics system uses USB communication between devices. If an open, short, short to +B or short to ground occurs in the USB circuit, communication is interrupted and the telematics system will not operate normally.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15DB

Telematics Transceiver Disconnected

DCM (telematics transceiver) disconnected
  • Harness or connector
  • DCM (telematics transceiver)
  • DCM (telematics transceiver) power source circuit
  • Radio and display receiver assembly

HINT:

This DTC may be stored due to environmental reasons such as electrical noise or interference.

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 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model with Dual Knob Type): PRECAUTION

  • 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.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

CHECK MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Hatchback Model

A

for Sedan Model

B
B

GO TO STEP 7

A

2.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) POWER SOURCE)

(a) Disconnect the I143 DCM (telematics transceiver) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I143-20(E) - Body ground

Always

Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I143-1 (+B) - I143-20 (E)

Always

11 to 14 V

I143-19 (IG2) - I143-20 (E)

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the I57 radio and display receiver assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I57-11 (USBG) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Radio and Display Receiver Assembly)

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I57-10 (USBV) - I57-11 (USBG)

Ignition switch ON

4.75 to 5.25 V
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the I57 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

I57-10 (USBV) - I143-15 (USBV)

Always

Below 1 Ω

I57-11 (USBG) - I143-31 (USBG)

Always

Below 1 Ω

I57-10 (USBV) or I143-15 (USBV) - Body ground

Always

10 kΩ or higher

I57-11 (USBG) or I143-31 (USBG) - 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 - DCM (TELEMATICS TRANSCEIVER))

(a) Check the installation condition.

(1) Check the USB communication lines between the radio and display receiver assembly and DCM (telematics transceiver) for any installation or connection problems.

(b) Disconnect the t2 radio and display receiver assembly connector.

(c) Disconnect the t7 DCM (telematics transceiver) connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

t2-1 (USB+) - t7-2 (USB+)

Always

Below 1 Ω

t2-2 (USB-) - t7-1 (USB-)

Always

Below 1 Ω

t2-3 (USBS) - t7-3 (USBS)

Always

Below 1 Ω

t2-1 (USB+) or t7-2 (USB+) - Body ground

Always

10 kΩ or higher

t2-2 (USB-) or t7-1 (USB-) - Body ground

Always

10 kΩ or higher

t2-3 (USBS) or t7-3 (USBS) - Body ground

Always

10 kΩ or higher

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

*b

Front view of wire harness connector

(to Radio and Display Receiver Assembly)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

(b) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(c) Turn the ignition switch off.

(d) Turn the ignition switch to IG and wait for 90 seconds.

(e) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

7.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) POWER SOURCE)

(a) Disconnect the I72 DCM (telematics transceiver) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I72-4 (E) - Body ground

Always

Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I72-1 (+B) - I72-4 (E)

Always

11 to 14 V

I72-8 (ACC) - I72-4 (E)

Ignition switch ACC

11 to 14 V

I72-7 (IG2) - I72-4 (E)

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the I57 radio and display receiver assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I57-11 (USBG) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Radio and Display Receiver Assembly)

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I57-10 (USBV) - I57-11 (USBG)

Ignition switch ON

4.75 to 5.25 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the I57 radio and display receiver assembly connector.

(b) Disconnect the t1 DCM (telematics transceiver) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I57-10 (USBV) - t1-5 (USBV)

Always

Below 1 Ω

I57-11 (USBG) - t1-3 (USBG)

Always

Below 1 Ω

I57-10 (USBV) or t1-5 (USBV) - Body ground

Always

10 kΩ or higher

I57-11 (USBG) or t1-3 (USBG) - 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) Check the installation condition.

(1) Check the USB communication lines between the radio and display receiver assembly and DCM (telematics transceiver) for any installation or connection problems.

(b) Disconnect the t2 radio and display receiver assembly connector.

(c) Disconnect the t1 DCM (telematics transceiver) connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

t2-1 (USB+) - t1-2 (USB+)

Always

Below 1 Ω

t2-2 (USB-) - t1-1 (USB-)

Always

Below 1 Ω

t2-3 (USBS) - t1-6 (USBS)

Always

Below 1 Ω

t2-1 (USB+) or t1-2 (USB+) - Body ground

Always

10 kΩ or higher

t2-2 (USB-) or t1-1 (USB-) - Body ground

Always

10 kΩ or higher

t2-3 (USBS) or t1-6 (USBS) - Body ground

Always

10 kΩ or higher

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

*b

Front view of wire harness connector

(to Radio and Display Receiver Assembly)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

(b) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(c) Turn the ignition switch off.

(d) Turn the ignition switch to IG and wait for 90 seconds.

(e) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY