Toyota CH-R Service Manual: Tire Pressure Monitor Receiver Communication Stop (B1247)

Toyota CH-R Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Tire Pressure Monitor Receiver Communication Stop (B1247)

DESCRIPTION

The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver are connected using 2 direct lines that they use to communicate with each other.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B1247	Tire Pressure Monitor Receiver Communication Stop	In diagnostic mode, an applicable RDA signal cannot be received within 10 seconds after a PRG signal is sent from the main body ECU (multiplex network body ECU).	Tire pressure warning ECU and receiver Wire harness or connector Main body ECU (multiplex network body ECU) ECU-IG1 NO. 4 fuse	This DTC is for main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU and receiver, read the IDs stored in the old ECU using the Techstream and write them down before removal.
Click here
It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.*
*: w/ Smart Key System

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HINT:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

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

(a) Turn the ignition switch off.

(b) Disconnect the M23 tire pressure warning ECU and receiver connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M23-4 (RDA) - F15-4 (RDA)	Always	Below 1 Ω
M23-4 (RDA) or F15-4 (RDA) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M23-12 (GND) - Body ground	Always	Below 1 Ω

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
M23-1 (IG) - Body ground	Ignition switch to ON	10 to 16 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

(a) Replace the tire pressure warning ECU and receiver.

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4.	CHECK DTC OUTPUT

(a) Clear the DTCs.

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Chassis > Tire Pressure Monitor > Clear DTCs

(b) Turn the ignition switch off.

(d) Check for DTCs.

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Chassis > Tire Pressure Monitor > Trouble Codes

OK:

DTC B1247 is not output.

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Receiver Error (C2176/76)

DESCRIPTION The signals are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. DTC No. Detection Item DTC Detection Condition ...

Transmitter ID1 Operation Stop (C2111/11-C2115/15)

DESCRIPTION The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted to the tire pressu ...

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