Toyota Tacoma (2015-2018) Service Manual: Tire Pressure Monitor Receiver Communication Stop (B1247)

Toyota Tacoma (2015-2018) Service Manual / Tire And Wheel / 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)	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 transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform initialization (See page ) after registration (See page ) 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 (See page ).*
*: w/ Smart Key System

HINT:

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

PROCEDURE

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

(a) Disconnect the T14*1, T25*2, T24*3 tire pressure warning ECU and receiver connector.

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
T14-4 (RDA) - M6-4 (RDA)1 T25-4 (RDA) - M6-4 (RDA)2 T24-4 (RDA) - M6-4 (RDA)*3	Always	Below 1 Ω
T14-4 (RDA) or M6-4 (RDA) - Body ground1 T25-4 (RDA) or M6-4 (RDA) - Body ground2 T24-4 (RDA) or M6-4 (RDA) - Body ground*3	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

T14-4 (RDA) - M6-4 (RDA)*1

T25-4 (RDA) - M6-4 (RDA)*2

T24-4 (RDA) - M6-4 (RDA)*3

Always

Below 1 Ω

T14-4 (RDA) or M6-4 (RDA) - Body ground*1

T25-4 (RDA) or M6-4 (RDA) - Body ground*2

T24-4 (RDA) or M6-4 (RDA) - Body ground*3

Always

10 kΩ or higher

*1: w/o Wireless Door Lock System
*2: w/o Smart Key System with Wireless Door Lock System
*3: w/ Smart Key System

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

T14-12 (GND) - Body ground*1

T25-12 (GND) - Body ground*2

T24-12 (GND) - Body ground*3

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
T14-1 (IG) - Body ground1 T25-1 (IG) - Body ground2 T24-1 (IG) - Body ground*3	Ignition switch ON	10 to 16 V

Tester Connection

Switch Condition

Specified Condition

T14-1 (IG) - Body ground*1

T25-1 (IG) - Body ground*2

T24-1 (IG) - Body ground*3

Ignition switch ON

10 to 16 V

Text in Illustration

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

*1: w/o Wireless Door Lock System
*2: w/o Smart Key System with Wireless Door Lock System
*3: w/ Smart Key System

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

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

4.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(d) Check for DTCs (See page OK: ).

OK:

DTC B1247 is not output.

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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