- Steering lock actuator assembly (steering lock ECU)
- Certification ECU (smart key ECU)
- Harness or connector
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018FMB |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: B2786; No Response from Steering Lock ECU; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
B2786 |
No Response from Steering Lock ECU |
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock actuator (steering lock ECU) stops for 10 seconds or more.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2786 |
Periodic transmission from the steering lock ECU stops for 10 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When using the Techstream with the ignition switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy 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.
HINT:
DTC B2785 is stored when the communication between the steering lock actuator assembly (steering lock ECU) and certification ECU (smart key ECU) stops.
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTC (See page
![2016 - 2020 MY Sienna [12/2015 - ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
|
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2786 is output |
A |
|
B2786 and B2785 are output |
B |
HINT:
When both B2786 and B2785 are output at the same time, troubleshoot B2785 first.
| B |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU) - STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)) |
(a) Disconnect the D88 certification ECU (smart key ECU) and D29 steering lock actuator assembly (steering lock ECU) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D88-29 (LIN) - D29-5 (LIN) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D88-29 (LIN) - Body ground |
Always |
10 kΩ or higher |
Text in Illustration
|
*a |
Front view of wire harness connector (to Certification ECU (smart key ECU)) |
|
*b |
Front view of wire harness connector (to Steering Lock Actuator Assembly (steering lock ECU)) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) - BATTERY VOLTAGE AND BODY GROUND) |
|
(a) Disconnect the D29 steering lock actuator assembly (steering lock ECU) connector. |
|
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D29-1 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D29-7 (B) - Body ground |
Always |
11 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Steering Lock Actuator Assembly (steering lock ECU)) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
(a) Temporarily replace the steering lock actuator assembly (steering lock ECU) with a new or normally functioning one (See page
).
(b) Clear the DTC (See page
).
|
|
6. |
CHECK FOR DTC |
(a) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2786 is not output |
A |
|
DTC B2786 is output |
B |
| A |
|
END (STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) IS MALFUNCTIONING) |
| B |
|
|
|