Lexus NX: No Response from Steering Lock ECU (B2786)

Lexus NX Service Manual / Power Source & Network / 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 actuator stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2786

No Response from Steering Lock ECU

Communication between the certification ECU (smart key ECU assembly) and steering lock ECU stops for 10 seconds or more.

  • Steering lock actuator assembly
  • Certification ECU (smart key ECU assembly)
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power switch off to troubleshoot:

    Connect the Techstream to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before replacing the certification ECU (smart key ECU assembly) or steering lock actuator assembly, refer to the immobiliser system.

HINT:

When the communication between the steering lock actuator assembly and certification ECU (smart key ECU assembly) stops, DTC B2785 is also stored.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Smart Access > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Smart Access > Trouble Codes
DTC B2786 is not output

USE SIMULATION METHOD TO CHECK

DTC B2786 is output

3.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - STEERING LOCK ACTUATOR ASSEMBLY)

(a) Disconnect the I53 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I2 steering lock actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I53-6 (LIN) - I2-5 (LIN)

Always

Below 1 Ω

I53-6 (LIN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

*a

Front view of wire harness connector

(to Steering Lock Actuator Assembly)

(a) Disconnect the steering lock actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I2-1 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I2-7 (B) - Body ground

Power switch off

11 to 14 V

I2-6 (IG) - Body ground

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE STEERING LOCK ACTUATOR ASSEMBLY

(a) Temporarily replace the steering lock actuator assembly with a new one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Smart Access > Clear DTCs
NEXT

6.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Smart Access > Trouble Codes
DTC B2786 is not output

END (STEERING LOCK ACTUATOR ASSEMBLY IS DEFECTIVE)

DTC B2786 is output

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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