Toyota Avalon Service & Repair Manual: Telematics Transceiver Disconnected (B15DB)

DESCRIPTION

If the radio and display receiver assembly cannot detect the DCM (telematics transceiver) for a certain period of time (90 seconds) after the power switch is turned on (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

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.
  • 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

PROCEDURE

1.

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

(a) Disconnect the G9 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-4 (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

G9-1 (+B) - G9-4 (E)

Power switch off

11 to 14 V

G9-8 (ACC) - G9-4 (E)

Power switch on (ACC)

11 to 14 V

G9-7 (IG2) - G9-4 (E)

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the G1 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

G1-11 (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

G1-10 (USBV) - G1-11 (USBG)

Power switch on (IG)

4.75 to 5.25 V

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

3.

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

(a) Disconnect the G1 radio and display receiver assembly connector.

(b) Disconnect the G11 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G1-10 (USBV) - G11-5 (USBV)

Always

Below 1 Ω

G1-11 (USBG) - G11-3 (USBG)

Always

Below 1 Ω

G1-10 (USBV) or G11-5 (USBV) - Body ground

Always

10 kΩ or higher

G1-11 (USBG) or G11-3 (USBG) - 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) 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 G108 radio and display receiver assembly connector.

(c) Disconnect the G11 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G108-1 (USB+) - G11-2 (USB+)

Always

Below 1 Ω

G108-2 (USB-) - G11-1 (USB-)

Always

Below 1 Ω

G108-3 (USBS) - G11-6 (USBS)

Always

Below 1 Ω

G108-1 (USB+) or G11-2 (USB+) - Body ground

Always

10 kΩ or higher

G108-2 (USB-) or G11-1 (USB-) - Body ground

Always

10 kΩ or higher

G108-3 (USBS) or G11-6 (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

5.

REPLACE DCM (TELEMATICS TRANSCEIVER)

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

Click here

(b) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (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

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