DTC B15DB: Telematics Transceiver Disconnected [08/2020 - 10/2022]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Clear DTCs 

2. Turn the ignition switch off.
3. Turn the ignition switch to ON and wait for 90 seconds.
4. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

NG 

See step  2

1. Disconnect the DCM (telematics transceiver) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to DCM [Telematics Transceiver])

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G131-20 (E) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G131-1 (+B) - G131-20 (E)	Ignition switch off	10.5 to 16 V*1 11 to 14 V*2
   G131-19 (IG2) - G131-20 (E)	Ignition switch ON	10.5 to 16 V*1 11 to 14 V*2

   1. *1: w/ Stop and Start System
   2. *2: w/o Stop and Start System

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the G1 radio and display receiver assembly connector.
2. Disconnect the G131 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G1-10 (USBV) - G131-15 (USBV)	Always	Below 1 Ω
   G1-11 (USBG) - G131-31 (USBG)	Always	Below 1 Ω
   G1-10 (USBV) or G131-15 (USBV) - Body ground	Always	10 kΩ or higher
   G1-11 (USBG) or G131-31 (USBG) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the radio and display receiver assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Radio and Display Receiver Assembly)

2. 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

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G1-10 (USBV) - G1-11 (USBG)	Ignition switch ON	4.75 to 5.25 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022] 

Result: 

OK 

See step  5

1. Disconnect the telephone ECU wire (to Transceiver) connector from the DCM (telematics transceiver).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to DCM [Telematics Transceiver])
   *b	Front view of wire harness connector (to Navigation ECU)

2. Disconnect the telephone ECU wire (to Transceiver) connector from the navigation ECU.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G134-2 (USB+) - G124-1 (USB+)	Always	Below 1 Ω
   G134-1 (USB-) - G124-2 (USB-)	Always	Below 1 Ω
   G134-3 (USBS) - G124-3 (USBS)	Always	Below 1 Ω
   G134-2 (USB+) or G124-1 (USB+) - Body ground	Always	10 kΩ or higher
   G134-1 (USB-) or G124-2 (USB-) - Body ground	Always	10 kΩ or higher
   G134-3 (USBS) or G124-3 (USBS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE ECU WIRE (TO TRANSCEIVER). Refer to  REMOVAL [10/2019 - 10/2022] 

Result: 

OK 

See step  6

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

   Refer to REMOVAL [10/2019 - 10/2022]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Clear DTCs 

3. Turn the ignition switch off.
4. Turn the ignition switch to ON and wait for 90 seconds.
5. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (DCM [TELEMATICS TRANSCEIVER] IS DEFECTIVE) 

Result: 

NG 

See step  7

1. Replace the navigation ECU with a new one.

   Refer to REMOVAL [10/2019 - 10/2022]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Clear DTCs 

3. Turn the ignition switch off.
4. Turn the ignition switch to ON and wait for 90 seconds.
5. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (NAVIGATION ECU IS DEFECTIVE) 

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022]