Toyota Avalon (XX50) 2019-2022 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 engine 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.

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 Navigation System.

  Click here

• When replacing the radio and display receiver assembly or navigation ECU, always replace it with a new one. If a radio and display receiver assembly or navigation ECU 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 or navigation ECU 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

(a) Clear the DTCs.

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG) and wait for 90 seconds.

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

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

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

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

Standard Resistance:

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

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(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:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(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:

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

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

(b) Disconnect the G113 navigation ECU connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition G11-2 (USB+) - G113-1 (USB+) Always Below 1 Ω G11-1 (USB-) - G113-2 (USB-) Always Below 1 Ω G11-6 (USBS) - G113-3 (USBS) Always Below 1 Ω G11-2 (USB+) or G113-1 (USB+) - Body ground Always 10 kΩ or higher G11-1 (USB-) or G113-2 (USB-) - Body ground Always 10 kΩ or higher G11-6 (USBS) or G113-3 (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 Navigation ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Click here

(b) Clear the DTCs.

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG) and wait for 90 seconds.

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

OK:

No DTCs are output.

OK

END (DCM (TELEMATICS TRANSCEIVER) IS DEFECTIVE)

NG

(a) Replace the navigation ECU with a new one.

Click here

(b) Clear the DTCs.

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG) and wait for 90 seconds.

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

OK:

No DTCs are output.

OK

END (NAVIGATION ECU IS DEFECTIVE)

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY