Lexus NX: 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. |
|
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.
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|
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| 2. | CHECK FOR DTC |
(a) Check for DTCs.
Click here
| DTC B2786 is not output | .gif) | USE SIMULATION METHOD TO CHECK |
|
| 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 |
|
| 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 |
|
| 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
|
| 6. | CHECK FOR DTC |
(a) Check for DTCs.
Click here
| 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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