DTC B15DB: Telematics Transceiver Disconnected [03/2017 - 09/2019]: Procedure

1. Disconnect the K12 DCM (telematics transceiver) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K12-4 (E) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K12-1 (+B) - K12-4 (E)	Always	11 to 14 V
   K12-8 (ACC) - K12-4 (E)	Ignition switch ACC	11 to 14 V
   K12-7 (IG2) - K12-4 (E)	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the K1 radio and display receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K1-11 (USBG) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K1-10 (USBV) - K1-11 (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 [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020] 

Result: 

OK 

See step  3

1. Disconnect the K1 radio and display receiver assembly connector.
2. Disconnect the K15 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K1-10 (USBV) - K15-5 (USBV)	Always	Below 1 Ω
   K1-11 (USBG) - K15-3 (USBG)	Always	Below 1 Ω
   K1-10 (USBV) or K15-5 (USBV) - Body ground	Always	10 kΩ or higher
   K1-11 (USBG) or K15-3 (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. 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.
2. Disconnect the K136 and K1 radio and display receiver assembly connectors.
3. Disconnect the K15 DCM (telematics transceiver) connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K136-1 (USB+) - K15-2 (USB+)	Always	Below 1 Ω
   K136-2 (USB-) - K15-1 (USB-)	Always	Below 1 Ω
   K136-3 (USBS) - K15-6 (USBS)	Always	Below 1 Ω
   K136-1 (USB+) or K15-2 (USB+) - Body ground	Always	10 kΩ or higher
   K136-2 (USB-) or K15-1 (USB-) - Body ground	Always	10 kΩ or higher
   K136-3 (USBS) or K15-6 (USBS) - Body ground	Always	10 kΩ or higher

   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 Radio and Display Receiver Assembly)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Refer to REMOVAL [03/2017 - 09/2019]

2. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

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

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]