Lexus ES: 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 or upper bracket assembly) stops for 10 seconds or more.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B2786 | No Response from Steering Lock ECU | No communication between steering lock ECU (steering lock actuator or upper bracket assembly) and certification ECU (smart key ECU assembly) for 10 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus Body Electrical Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
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Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Registration.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)) |
(a) Disconnect the G47 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(c) 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 power switch from on (IG) to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G47-13 (LIN) - G51-5 (LIN) | Power switch off | Below 1 Ω |
| G47-13 (LIN) or G51-5 (LIN) - Body ground | Power switch off | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - AUXILIARY BATTERY, BODY GROUND) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G51-7 (B) - G51-1 (GND) | Power switch off | 11 to 14 V |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G51-1 (GND) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
(a) Replace the steering lock ECU (steering lock actuator or upper bracket assembly).
Click here
|
| 4. | REGISTER ECU CODE REGISTRATION |
(a) Register the recognition codes in the ECUs.
Click here
|
| 5. | CHECK FOR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs(b) Recheck for DTCs.
Body Electrical > Smart Access > Trouble CodesOK:
DTC B2786 is not output.
| OK | | END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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