- Sliding roof ECU
- Main body ECU (cowl side junction block LH)
- 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: RM000002S8A00CX |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1273 |
Sliding Roof ECU Communication Stop |
DESCRIPTION
This DTC is stored when LIN communication between the sliding roof ECU and main body ECU (cowl side junction block LH) stops for 10 seconds or more.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1273 |
No communication between the sliding roof ECU and main body ECU (cowl side junction block LH) 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 B2325 is stored when the communication between the sliding roof ECU and main body ECU (cowl side junction block LH) stops.
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTC
.
|
|
2. |
CHECK FOR DTC |
(a) Recheck for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1273 is output |
A |
|
DTC B1273 is not output |
B |
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU) |
(a) Disconnect the E3 and R5 ECU connectors.
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E3-10 (LIN2) - R5-4 (MPX1) |
Always |
Below 1 Ω |
|
E3-10 (LIN2) or R5-4 (MPX1) - Body ground |
Always |
10 kΩ or higher |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R5-4 (MPX1) - Body ground |
Always |
Below 1 V |
|
|
4. |
CHECK SLIDING ROOF ECU (BATTERY VOLTAGE AND BODY GROUND) |
|
(a) Disconnect the R5 ECU connector. |
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R5-2 (E) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R5-1 (B) - Body ground |
Always |
11 to 14 V |
|
|
5. |
REPLACE SLIDING ROOF ECU |
(a) Temporarily replace the sliding roof 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 B1273 is not output |
A |
|
DTC B1273 is output |
B |
|
|
|