DTC B1247: Tire Pressure Monitor Receiver Communication Stop [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TIRE PRESSURE WARNING ECU AND RECEIVER)

Disconnect the P29 or P25 tire pressure warning ECU and receiver connector.
Disconnect the H10 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance

FOR FMVSS138 TYPE

Tester Connection	Condition	Specified Condition
P29-4 (RDA) - H10-16 (RDA)	Always	Below 1 Ω
H10-16 (RDA) - Body ground	Always	10 kΩ or higher

FOR ECE-R64 TYPE

Tester Connection	Condition	Specified Condition
P25-4 (RDA2) - H10-16 (RDA)	Always	Below 1 Ω
H10-16 (RDA) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF TIRE PRESSURE WARNING ECU AND RECEIVER)

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

FOR FMVSS138 TYPE

Tester Connection	Condition	Specified Condition
P29-12 (GND) - Body ground	Always	Below 1 Ω

FOR ECE-R64 TYPE

Tester Connection	Condition	Specified Condition
P25-12 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

FOR FMVSS138 TYPE

Tester Connection	Condition	Specified Condition
P29-1 (IG) - Body ground	Power switch on (IG)	10 to 16 V

FOR ECE-R64 TYPE

Tester Connection	Condition	Specified Condition
P25-1 (IG) - Body ground	Power switch on (IG)	10 to 16 V

TEXT IN ILLUSTRATION

*A	for FMVSS138 Type
*B	for ECE-R64 Type
*a	Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER
1. Replace the tire pressure warning ECU and receiver. Refer to REMOVAL [08/2013 - ] .
NEXT: Go to next step
CHECK DTC OUTPUT (B1247)
1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
2. Turn the power switch off.
3. Turn the power switch on (IG).
4. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
  OK
  
  DTC B1247 is not output.
NG → See step 5

OK → END
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [08/2013 - ]