- ID code box (immobiliser code ECU)
- Certification ECU (smart key ECU assembly)
- Harness or connector
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002S8H008X |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B2789 |
No Response from ID BOX |
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2789 |
No communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When using the Techstream with the engine 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.
HINT:
DTC B2785 is stored when the communication between the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) stops.
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTC
.
|
|
2. |
CHECK FOR DTC |
(a) Recheck for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2789 is output |
A |
|
DTC B2789 is not output |
B |
|
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX) |
(a) Disconnect the E29 ECU connector.
(b) Disconnect the E28 box connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E29-10 (LIN) - E28-3 (LIN1) |
Always |
Below 1 Ω |
|
E29-10 (LIN) or E28-3 (LIN1) - Body ground |
Always |
10 kΩ or higher |
|
|
4. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND) |
|
(a) Disconnect the E28 box connector. |
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E28-8 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E28-1 (+B) - Body ground |
Always |
11 to 14 V |
|
|
5. |
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
.
|
|
6. |
CHECK FOR DTC |
(a) Recheck for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2789 is output |
A |
|
DTC B2789 is not output |
B |
|
|
|