DTC B1573: Short in Telephone Antenna Circuit; DTC B15CB: Telematics Transceiver Antenna Disconnected [01/2018 - ]: 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. Perform "HEALTH CHECK" and check for current DTCs.

   Refer to HEALTH CHECK [01/2018 - ]

   Result

   Result	Proceed to
   DTC B1573 or B15CB is output	A
   DTC B1573 or B15CB is not output	B

Result: 

B 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

A 

See step  2

1. Remove the telephone and GPS antenna (telephone antenna assembly).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone Antenna Assembly)

   Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

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 (ROOF ANTENNA ASSEMBLY). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Telephone and GPS Antenna (Telephone Antenna Assembly))
   *b	Front view of wire harness connector (to Antenna Cord Sub-assembly)

2. Disconnect the antenna cord sub-assembly No. 2 from the antenna cord sub-assembly 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	Always	Below 1 Ω
   A-4a - B-1a	Always	Below 1 Ω
   A-4 - Body ground	Always	10 kΩ or higher
   A-4a - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ANTENNA CORD SUB-ASSEMBLY NO. 2. Refer to  REMOVAL [01/2018 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  4

1. Disconnect the antenna cord sub-assembly from the antenna cord sub-assembly No. 2 connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Antenna Cord Sub-assembly No. 2)
   *b	Front view of wire harness connector (to DCM)

2. Disconnect the antenna cord sub-assembly from 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
   B-1 - C-1 (ANT1)	Always	Below 1 Ω
   B-1a - C-1a	Always	Below 1 Ω
   B-1 - Body ground	Always	10 kΩ or higher
   B-1a - 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 [01/2018 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  5

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

   Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

   OK

   The system returns to normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (TELEPHONE AND GPS ANTENNA IS DEFECTIVE) 

Result: 

NG 

See step  6

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [01/2018 - 11/2018] , or refer to REMOVAL [11/2018 - ]

   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 [01/2018 - ]