Toyota Tacoma 2015-2018 Service Manual: Sliding Roof ECU Communication Stop (B1273)

Toyota Tacoma 2015-2018 Service Manual / Multiplex Communication / Lin Communication System / Sliding Roof ECU Communication Stop (B1273)

DESCRIPTION

This DTC is stored when LIN communication between the sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.	DTC Detection Condition	Trouble Area
B1273	No communication between sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Sliding roof ECU (sliding roof drive gear sub-assembly) Main body ECU (multiplex network body ECU) Driver side junction block Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page )
When the sliding roof ECU (sliding roof drive gear sub-assembly) is replaced or removed and reinstalled, it requires initialization (See page ).

PROCEDURE

1.	INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page (b) Remove the main body ECU (multiplex network body ECU) from the driver side ).

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1D-12 - MB-16 (LIN2)	Always	Below 1 Ω

Text in Illustration

Component without harness connected

(Driver Side Junction Block)

HINT:

This inspection is to check the LIN line in the driver side junction block that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

REPLACE DRIVER SIDE JUNCTION BLOCK

2.	CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY))

(a) Disconnect the 1D driver side junction block connector.

(b) Disconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1D-12 - S50-11 (LIN)	Always	Below 1 Ω
1D-12 or S50-11 (LIN) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - POWER SOURCE CIRCUIT)

(a) Disconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
S50-8 (B) - S50-12 (E)	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
S50-12 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

(a) Replace the sliding roof ECU (sliding roof drive gear sub-assembly) (See page ).

5.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Recheck for DTCs. ).

(b) Recheck for DTCs.

OK:

DTC B1273 is not output.

END (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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