Toyota CH-R Service Manual: Double Locking ECU Communication Stop (B1249)

Toyota CH-R Service Manual / Networking / Lin Communication System / Double Locking ECU Communication Stop (B1249)

DESCRIPTION

The main body ECU (multiplex network body ECU) stores this DTC when communication with the double lock door control relay assembly stops for 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1249	Double Locking ECU Communication Stop	No communication between double lock door control relay assembly and main body ECU (multiplex network body ECU) for 10 seconds or more	Double lock door control relay assembly Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector DOOR DBL/L fuse ECU-DCC NO. 2 fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.*1
Click here
- *1: w/ Smart Key System

PROCEDURE

1.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

Component without harness connected (Instrument Panel Junction Block Assembly)

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

HINT:

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3D-17 - MB-16 (LIN2)	Always	Below 1 Ω

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY)

(a) Disconnect the F14 double lock door control relay assembly connector.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
3D-17 - F14-9 (LIN)	Ignition switch off	Below 1 Ω
F14-9 (LIN) or 3D-17 - Body ground	Ignition switch off	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY - BATTERY, BODY GROUND)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F14-12 (+B) - F14-7 (GND)	Always	11 to 14 V
F14-11 (CPUB) - F14-7 (GND)	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F14-7 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY

(a) Replace the double lock door control relay assembly.

Click here

5.	CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1249 is not output.

END (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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LIN Communication Bus Malfunction (B2325)

DESCRIPTION If the main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 7 seconds or more, DTC B2325 will be stored. ...

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