DTC B1247: Tire Pressure Monitor Receiver Communication Stop [12/2019 - 11/2023]: Procedure

1. Using an oscilloscope, check the waveform.
   NOTE:

   With the connector connected, check from the backside of the connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Tire Pressure Warning ECU and Receiver)
   *b	GND

   OK

   Tester Connection	Tool Setting Range	Condition	Specified Condition
   M51-4 (RDA) - Body ground	5 V/DIV.5 ms./DIV.	Ignition switch ON	Waveform generation

   Result

   Result	Proceed to
   Waveform is as shown in the illustration. (Waveform alternates between 10.5 V or higher and 0.5 V or less)	A
   Waveform does not change from 10.5 V or higher	B
   Waveform does not change from 0.5 V or less	C

Result: 

A 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

B 

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

C 

See step  2

1. Disconnect the M51 tire pressure warning ECU and receiver connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M51-4 (RDA) - Body ground	Ignition switch ON	10.5 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

See step  3

1. Turn the ignition switch off.
2. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H44-10 (RDA) - M51-4 (RDA)	Always	Below 1 Ω
   H44-10 (RDA) or M51-4 (RDA) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR