DTC B1536: Short in Telephone SUB Antenna Circuit; DTC B1537: Open in Telephone SUB Antenna Circuit [04/2018 - 08/2020]: Procedure

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

   Body Electrical > Telematics > Clear DTCs 

6. Recheck for DTCs.

   Body Electrical > Telematics > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1536 or B1537 is output	A
   DTC B1536 or B1537 is not output	B

Result: 

B 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

Result: 

A 

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))

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

   Standard Resistance

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Front Side). Refer to  REMOVAL [04/2018 - 08/2020] 

Result: 

OK 

See step  3

1. Disconnect the F telephone and GPS antenna cord (No. 4 antenna cord sub-assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone and GPS Antenna Cord (No. 4 Antenna Cord Sub-assembly))

2. Disconnect the E telephone and GPS antenna cord (No. 4 antenna cord sub-assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone and GPS Antenna Cord (No. 4 Antenna Cord Sub-assembly))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F-4 - E-3	Always	Below 1 Ω
   F-4 or E-3 - Body ground	Always	10 kΩ or higher
   F-4a - E-3a	Always	Below 1 Ω
   F-4a or E-3a - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 4 ANTENNA CORD SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2021] 

Result: 

OK 

See step  4

1. Disconnect the D telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone and GPS Antenna Cord (No. 6 Antenna Cord Sub-assembly))

2. Disconnect the A telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone and GPS Antenna Cord (No. 6 Antenna Cord Sub-assembly))

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

   Standard Resistance

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2020] 

Result: 

OK 

See step  5

1. Replace the telephone and GPS antenna assembly (for Front Side) with a known good one and check if the same problem occurs again.

   Refer to REMOVAL [04/2018 - 08/2020]

   OK

   The system returns to normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

See step  6

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [04/2018 - 08/2020]

   NOTE:

   • The power switch must be off.
   • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [04/2018 - 08/2020]