DESCRIPTION This DTC is
stored when LIN communication between the sliding roof drive gear
sub-assembly and main body ECU (multiplex network body ECU) stops for 10
seconds or more. |
DTC No. | DTC Detection Condition |
Trouble Area | | B1273 |
No
communication between sliding roof drive gear sub-assembly and main
body ECU (multiplex network body ECU) for 10 seconds or more |
- Sliding roof drive gear sub-assembly (Sliding Roof ECU)
- Driver side junction block assembly
- Main body ECU (multiplex network body ECU)
- Harness or connector
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a
courtesy light switch on and off at 1.5 second intervals until
communication between the Techstream and vehicle begins.
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- w/ Sliding Roof System:
When the sliding roof drive gear sub-assembly is
removed and reinstalled or replaced, the sliding roof drive gear
sub-assembly must be initialized.
Click here 
HINT: DTC
B2325 is output when the communication between all of the following
components and main body ECU (multiplex network body ECU) stops. Click here
PROCEDURE
(a) Clear the DTCs. Click here
|
NEXT |
 | |
(a) Check for DTCs.
Click here
| DTC B1273 is not output |
 | USE SIMULATION METHOD TO CHECK |
|
DTC B1273 is output | |
| |
| 3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) |
(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.
Click here (b) Disconnect the W3 sliding roof drive gear sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A-16 (LIN2) - W3-3 (LIN) |
Always | Below 1 Ω | |
A-16 (LIN2) - Body ground |
Always | 10 kΩ or higher |
| NG |
| GO TO STEP 7 |
|
OK | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY - BATTERY AND BODY GROUND) |
| (a) Disconnect the sliding roof drive gear sub-assembly connector. |
 |
|
*a | Front view of wire harness connector
(to Sliding Roof Drive Gear Sub-assembly) | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
W3-8 (E) - Body ground |
Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
W3-10 (B) - Body ground |
Always | 11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 5. |
REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
(a) Temporarily replace the sliding roof drive gear sub-assembly with a new or normally functioning one.
Click here (b) Clear the DTCs.
Click here
|
NEXT | |
| |
(a) Check for DTCs.
Click here
| DTC B1273 is not output |
| END (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY IS DEFECTIVE) |
| DTC B1273 is output |
| REPLACE BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 7. |
CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) |
(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.
Click here (b) Disconnect the W3 sliding roof drive gear sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
3I-17 - W3-3 (LIN) | Always |
Below 1 Ω | |
3I-17 - Body ground | Always |
10 kΩ or higher |
| OK |
| REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
