| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001FNIA |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [11/2018 - 12/2021] |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: B2785; Communication Malfunction between ECUs Connected by LIN; 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021] | ||
|
DTC |
B2785 |
Communication Malfunction between ECUs Connected by LIN |
DESCRIPTION
If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more, DTC B2785 will be stored.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B2785 |
Communication Malfunction between ECUs Connected by LIN |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before performing the inspection, check that DTC B2786 or B278C is not output.
Click here
![2019 - 2024 MY RAV4 RAV4 HV [11/2018 - ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- When using the Techstream with the ignition 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key. 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.
-
Before replacing the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or steering lock actuator with ECU assembly, refer to Registration.
for HV Model: Click here
for Gasoline Model: Click here
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs
(b) Recheck for DTCs.
Click here
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
| B |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
|
|
2. |
CHECK STEERING LOCK ACTUATOR WITH ECU ASSEMBLY |
(a) Disconnect the G56 steering lock actuator with ECU assembly connector.
(b) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs
(c) Recheck for DTCs.
Click here
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
| B |
|
|
|
3. |
CHECK ID CODE BOX (IMMOBILIZER CODE ECU) |
(a) Disconnect the G57 ID code box (immobilizer code ECU) connector.
(b) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs
(c) Recheck for DTCs.
Click here
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
| B |
|
REPLACE ID CODE BOX (IMMOBILIZER CODE ECU)
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU) |
(a) Disconnect the G54 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the G56 steering lock actuator with ECU assembly connector.
(c) Disconnect the G57 ID code box (immobiliser code ECU) connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G54-13 (LIN) - G56-5 (LIN) |
Always |
Below 1 Ω |
|
G54-13 (LIN) - G57-2 (LIN1) |
Always |
Below 1 Ω |
|
G54-13 (LIN), G56-5 (LIN) or G57-2 (LIN1) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|