DTC B1537-11: Telephone Sub Antenna Circuit Short to Ground; DTC B1537-13: Telephone Sub Antenna Circuit Open [10/2020 - 10/2022]: 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. Check for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2022]

   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 [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] 

Result: 

NG 

See step  2

1. Remove the Telephone and GPS antenna (for Front Side).

   Refer to REMOVAL [10/2020 - 10/2022]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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 (for Front Side). Refer to  REMOVAL [10/2020 - 10/2022] 

Result: 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Telephone and GPS Antenna [for Front Side])
   *b	Front view of wire harness connector (to DCM [Telematics Transceiver])

2. Disconnect the DCM (Telematics Transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-4 - B-1 (ANT3)	Always	Below 1 Ω
   A-4a - B-1a	Always	Below 1 Ω
   A-4 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY [I/P]). Refer to  REMOVAL [10/2020 - 10/2022] 

Result: 

OK 

See step  4

1. Replace the telephone and GPS antenna (for front side) with a known good one.

   Refer to REMOVAL [10/2020 - 10/2022]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2022]

   Body Electrical > Telematics > Clear DTCs 

3. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2022]

   Body Electrical > Telematics > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (TELEPHONE AND GPS ANTENNA [FOR FRONT SIDE] IS DEFECTIVE) 

Result: 

NG 

See step  5

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [10/2020 - 10/2022]

   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 [10/2020 - 10/2022]