- Certification ECU (smart key ECU assembly)
- Main body ECU (cowl side junction block LH)
- ID code box (immobiliser code ECU)
- Steering lock ECU
- Harness and connector
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002XHV00CX |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B2785 |
Communication Malfunction between ECUs Connected by LIN |
DESCRIPTION
The certification ECU (smart key ECU assembly) intermittently monitors the LIN communication bus between the components related to certification. DTC B2785 is stored when a malfunction in the LIN communication bus between the components related to certification is detected continuously 3 times.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2785 |
The certification ECU (smart key ECU assembly) detects a malfunction in the LIN communication bus between components related to certification continuously 3 times. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When using the Techstream with the engine switch off to troubleshoot:
Connect 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.
HINT:
When DTC B2785 and B2287 are output simultaneously, perform the troubleshooting for DTC B2785 first.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - MAIN BODY ECU) |
(a) Disconnect the 2D and E29 ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E29-10 (LIN) - 2D-20 (LIN1) |
Always |
Below 1 Ω |
|
E29-10 (LIN) - Body ground |
Always |
10 kΩ or higher |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E29-10 (LIN) - Body ground |
Always |
Below 1 V |
|
|
2. |
CHECK FOR DTC |
(a) Clear the DTC
.
(b) Reconnect the E29 ECU connector.
(c) Recheck for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
|
|
3. |
CHECK FOR DTC |
(a) Clear the DTC
.
(b) Reconnect the 2D ECU connector.
(c) Disconnect the E26 ECU connector.
(d) Recheck for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
|
|
4. |
CHECK FOR DTC |
(a) Clear the DTC
.
(b) Reconnect the E26 ECU connector.
(c) Disconnect the E28 box connector.
(d) Recheck for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is output |
A |
|
DTC B2785 is not output |
B |
|
|
5. |
REPLACE MAIN BODY ECU (COWL PANEL JUNCTION BLOCK LH) |
(a) Temporarily replace the main body ECU (cowl side junction block LH) with a new or normally functioning one.
(b) Clear the DTC
.
|
|
6. |
CHECK FOR DTC |
(a) Recheck for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is not output |
A |
|
DTC B2785 is output |
B |
|
|
7. |
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) |
(a) Temporarily replace the steering lock ECU with a new or normally functioning one
.
(b) Clear the DTC
.
|
|
8. |
CHECK FOR DTC |
(a) Recheck for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is not output |
A |
|
DTC B2785 is output |
B |
|
|
9. |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Temporarily replace the ID code box (immobiliser code ECU) with a new or normally functioning one
.
(b) Clear the DTC
.
|
|
10. |
CHECK FOR DTC |
(a) Recheck for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2785 is not output |
A |
|
DTC B2785 is output |
B |
|
|
|