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:
Receiver Error (C2176/76)
DESCRIPTION
Tire pressure warning valve and transmitter signals are transmitted to the tire
pressure warning ECU and receiver in the vehicle as radio waves.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Note
C2 ...
Precaution
PRECAUTION
HANDLING PRECAUTION FOR CRUISE CONTROL SYSTEM
(a) Turn the cruise control system off using the cruise control main switch (ON-OFF
button) when not using the cruise control system.
(b) Be careful as the vehicle speed increases when driving downhill with the
cruise control system con ...
Sliding Roof does not Move by Operating Sliding Roof Control Switch
DESCRIPTION
The sliding roof ECU (sliding roof drive gear sub-assembly) receives slide and
tilt signals when the sliding roof switch is operated and drives its built-in motor.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before ...
