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 |
Any of the following conditions is met:
|
|
Vehicle Condition |
|||||
---|---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
Pattern 4 |
||
Diagnosis Condition |
- |
○ |
○ |
○ |
○ |
Malfunction Status |
Errors in LIN communication between ECUs |
○ |
- |
- |
- |
Open in communication lines |
- |
○ |
- |
- |
|
Short in communication lines |
- |
- |
○ |
- |
|
The certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines |
- |
- |
- |
○ |
|
Detection Time |
- |
- |
- |
7 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU) |
(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the F78 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(c) Disconnect the F21 ID code box (immobiliser code ECU) connector.
(d) 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 ignition switch from ON to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F1-13 (LIN) - F21-2 (LIN1) |
Ignition switch off |
Below 1 Ω |
F1-13 (LIN) - F78-5 (LIN) |
Ignition switch off |
Below 1 Ω |
F1-13 (LIN), F78-5 (LIN) or F21-2 (LIN1) - Body ground |
Ignition switch off |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK FOR DTC (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY)) |
(a) Reconnect the F1 certification ECU (smart key ECU assembly) connector.
(b) Reconnect the F21 ID code box (immobiliser code ECU) connector.
(c) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs(d) Recheck for DTCs.
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) |
|
3. |
CHECK FOR DTC (ID CODE BOX (IMMOBILISER CODE ECU)) |
(a) Reconnect the F78 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Disconnect the F21 ID code box (immobiliser code ECU) connector.
(c) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs(d) Recheck for DTCs.
Body Electrical > Smart Key > Trouble Codes
Result |
Proceed to |
---|---|
DTC B2785 is output |
A |
DTC B2785 is not output |
B |
A |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
B |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
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Body Electrical > Air Conditioner > Trouble Codes
(e) Check for DTCs.
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