DTC B1247: Tire Pressure Monitor Receiver Communication Stop [11/2016 - ]: Procedure

1. Disconnect the M25 tire pressure warning ECU and receiver connector.
2. Disconnect the F19 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
   M25-4 (RDA) - F19-4 (RDA)	Always	Below 1 Ω
   M25-4 (RDA) or F19-4 (RDA) - Body ground	Always	10 kΩ or higher

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M25-12 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M25-1 (IG) - Body ground	Ignition switch ON	10.5 to 16 V*1 10 to 16 V*2

   ()	*1: w/ Stop and Start System*2: w/o Stop and Start System

   Result	Proceed to
   OK	A
   NG (w/ Stop and Start System)	B
   NG (w/o Stop and Start System)	C

Result: 

B 

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT). 

Refer to  Backup Boost Converter Circuit [11/2016 - ] 

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

A 

See step  3

1. Replace the tire pressure warning ECU and receiver.

   Refer to REMOVAL [12/2013 - ]

Result: 

NEXT 

See step  4

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2013 - ]

   Body Electrical > Main Body > Clear DTCs 

2. Turn the ignition switch off.
3. Turn the ignition switch to ON.
4. Check for DTCs.

   Refer to DTC CHECK / CLEAR [12/2013 - ]

   Body Electrical > Main Body > Trouble Codes 

   OK

   DTC B1247 is not output.

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). 

Refer to  REMOVAL [12/2013 - ]