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 |
- Errors in LIN communication between ECUs or an open or short in communication lines.
- 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.
|
- Certification ECU (smart key ECU assembly)
- Steering lock ECU (steering lock actuator or upper bracket assembly)
- Wire harness or connector
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the certification ECU (smart key ECU assembly) or
steering lock ECU (steering lock actuator or upper bracket assembly),
refer to Registration.
Click here 
- Before performing the inspection, check that DTC B2786 or B278C is not output.
Click here
- When using the Techstream with the engine 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.
PROCEDURE |
1. | CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
(a) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Clear the DTCs. Body Electrical > Smart Key > Clear DTCs (c) After 7 seconds have elapsed, check if the DTC is output. Body Electrical > Smart Key > Trouble Codes
|
Result | Proceed to | |
DTC B2785 is output | A | |
DTC B2785 is not output |
B |
| B |
 | REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
|
A |
 | |
| 2. |
CHECK
HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) -
STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)) |
(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G40-13 (LIN) - Body ground |
Always | 10 kΩ or higher | |
G40-13 (LIN) - Other terminals |
Always | 10 kΩ or higher |
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
