Toyota Venza: No Response from Steering Lock ECU (B2786)

Toyota Venza Service Manual / Networking / Lin Communication System / No Response from Steering Lock ECU (B2786)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) stops for more than 10 seconds.

DTC No.	DTC Detection Condition	Trouble Area
B2786	No communication between the steering lock ECU (steering lock actuator assembly) and certification ECU (smart key ECU assembly) for more than 10 seconds.	Steering lock ECU (Steering lock actuator assembly) Certification ECU (Smart key ECU assembly) Wire harness or connector STR LOCK fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the certification ECU (smart key ECU assembly) is replaced, register the key.
If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code.
When using the Techstream to troubleshoot with the ignition switch off:
Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)

(a) Disconnect the D17 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-1 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
D17-7 (B) - Body ground	Always	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)

(a) Disconnect the D25 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D25-29 (LIN) - D17-5 (LIN)	Always	Below 1 Ω
D25-29 (LIN) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

(a) Replace the steering lock ECU (steering lock actuator assembly) (See page ).

4.	CHECK DTC OUTPUT

(a) Clear the DTC (See page ).

(b) Recheck for DTCs.

OK:

DTC B2786 is not output.

END (STEERING LOCK ECU WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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