Toyota Tacoma 2015-2018 Service Manual: Sliding Roof ECU Communication Stop (B1273)
DESCRIPTION
This DTC is stored when LIN communication between the sliding roof ECU (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 ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) for 10 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- If the main body ECU (multiplex network body ECU) is replaced, refer
to Registration (See page
.gif)
) - When the sliding roof ECU (sliding roof drive gear sub-assembly) is
replaced or removed and reinstalled, it requires initialization (See page
).
PROCEDURE
|
1. |
INSPECT DRIVER SIDE JUNCTION BLOCK |
(a) Remove the driver side junction block (See page
).
(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1D-12 - MB-16 (LIN2) |
Always |
Below 1 Ω |
|
*a |
Component without harness connected (Driver Side Junction Block) |
- |
- |
HINT:
This inspection is to check the LIN line in the driver side junction block that connects the wire harness to the built-in main body ECU (multiplex network body ECU).
| NG | .gif) |
REPLACE DRIVER SIDE JUNCTION BLOCK |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)) |
(a) Disconnect the 1D driver side junction block connector.
(b) Disconnect the S50 sliding roof ECU (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 |
|---|---|---|
|
1D-12 - S50-11 (LIN) |
Always |
Below 1 Ω |
|
1D-12 or S50-11 (LIN) - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - POWER SOURCE CIRCUIT) |
(a) Disconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
S50-8 (B) - S50-12 (E) |
Always |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
S50-12 (E) - Body ground |
Always |
Below 1 Ω |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) |
(a) Replace the sliding roof ECU (sliding roof drive gear sub-assembly) (See
page ).
|
|
5. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs.
OK:
DTC B1273 is not output.
| OK | |
END (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY WAS DEFECTIVE) |
| NG | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Main Body ECU (Multiplex Network Body ECU)
DTC Code
Detection Item
See page
B1206
P/W Master Switch Communi ...
Driver Side Door ECU Communication Stop (B2321)
DESCRIPTION
This DTC is stored when LIN communication between the front power window regulator
motor assembly LH and main body ECU (multiplex network body ECU) stops for 10 seconds
or more.
...
Other materials:
Rear Body Side Panel Protector
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE
1. INSTALL REAR BODY SIDE PANEL PROTECTOR
(a) for Sho ...
How To Proceed With Troubleshooting
PROCEDURE
1.
CHECK TIRE AND WHEEL SYSTEM
DIAGNOSIS OF IRREGULAR TIRE WEAR
GO TO STEP 11
DIAGNOSIS OF TIRE VIBRATION
2.
TIGHTEN WHEEL NUTS
...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful because intermittent conditions or signals ...