DTC B1537-11: Telephone Sub Antenna Circuit Short to Ground; DTC B1537-13: Telephone Sub Antenna Circuit Open [09/2020 - ]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and wait for 10 seconds or more.
4. Turn the Techstream on.
5. Clear the DTCs.

   Body Electrical > Telematics > Clear DTCs 

6. Check for DTCs and check that no DTCs are output.

   Body Electrical > Telematics > 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 [09/2020 - 01/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2023 - ] 

Result: 

NG 

See step  2

1. Disconnect the telephone and GPS antenna assembly (for Front Side) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone and GPS Antenna Assembly (for Front Side))

   Refer to REMOVAL [09/2020 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4 - 4a	Always	9 to 11 kΩ

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Front Side). Refer to  REMOVAL [09/2020 - ] 

Result: 

OK 

See step  3

1. Disconnect the antenna connector from the telephone and GPS antenna assembly (for Front Side).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (to Telephone and GPS Antenna Assembly (for Front Side))

2. Disconnect the antenna connector from the DCM (telematics transceiver).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (to DCM (Telematics Transceiver))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D-4 - A-1	Always	Below 1 Ω
   D-4a - A-1a	Always	Below 1 Ω
   D-4 or A-1 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY). Refer to  REMOVAL [09/2020 - ] 

Result: 

OK 

See step  4

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

   Refer to REMOVAL [09/2020 - ]

   NOTE:

   • The engine switch must be off.
   • Do not exchange the DCM (telematics transceiver) with one from another vehicle.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [09/2020 - ]