NETWORKING LIN COMMUNICATION SYSTEM B1273 Sliding Roof ECU Communication Stop

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.	Detection Item	DTC Detection Condition	Trouble Area
B1273	Sliding Roof ECU Communication Stop	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.	· Sliding roof ECU (sliding roof drive gear sub-assembly) · Main body ECU (multiplex network body ECU) · Instrument panel junction block assembly · Wire harness or connector · S/ROOF fuse

WIRING DIAGRAM

0.344,1.01 2.063,1.375 1.719,0.365 10 false Main Body ECU (Multiplex Network Body ECU) 0.188,1.688 0.594,1.948 0.406,0.26 10 false 3C 0.448,2.479 3.448,2.667 3,0.188 10 false : LIN Communication Line 0.198,1.844 3.26,2.115 3.063,0.271 10 false Instrument Panel Junction Block Assembly 0.333,0.854 0.74,1.115 0.406,0.26 10 false MB 3.313,1.844 5.229,2.219 1.917,0.375 10 false Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly) 3.302,1.677 3.708,1.938 0.406,0.26 10 false O16 4.51,1.313 4.917,1.573 0.406,0.26 10 false E 4.708,1.177 5.115,1.438 0.406,0.26 10 false 12 4.51,0.458 4.917,0.719 0.406,0.26 10 false B 4.719,0.323 5.125,0.583 0.406,0.26 10 false 8 3.771,0.469 4.281,0.688 0.51,0.219 10 false MPX1 3.521,0.323 3.927,0.583 0.406,0.26 10 false 11 2.833,0.313 3.24,0.573 0.406,0.26 10 false 23 1.469,0.469 1.979,0.688 0.51,0.219 10 false LIN2 1.865,0.313 2.271,0.573 0.406,0.26 10 false 16 4.938,0.594 5.75,0.823 0.813,0.229 10 false S/ROOF 6.042,0.438 7.031,0.667 0.99,0.229 10 false from Battery

CAUTION / NOTICE / HINT

NOTICE:: ·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

When the sliding roof ECU (sliding roof drive gear sub-assembly) is replaced or removed and reinstalled, it requires initialization.

Click hereVehicle Exterior>SLIDING ROOF / CONVERTIBLE>SLIDING ROOF SYSTEM>INITIALIZATION

PROCEDURE

1.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Remove the instrument panel junction block assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL

1.875,0.927 2.333,1.167 0.458,0.24 5.375,0.75 5.833,0.99 0.458,0.24 1.75,2.167 2.031,2.167 2.031,2.167 2.031,1.75 false 0.438,0.26 0.75,0.458 0.313,0.198 10 *a 5.521,0.792 5.833,0.99 0.313,0.198 10 3C 2.01,0.969 2.323,1.167 0.313,0.198 10 MB 1.438,2.083 1.75,2.281 0.313,0.198 10 LIN2

Component without harness connected
(Instrument Panel Junction Block Assembly)

Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Measure the resistance according to the value(s) in the table below.

HINT:: This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-23 - MB-16 (LIN2)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY))

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY))

Disconnect the O16 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

Measure the resistance according to the value(s) in the table below.

NOTICE:: Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-23 -O16-11 (MPX1)	Ignition switch off	Below 1 Ω
O16-11 (MPX1) or 3C-23 - Body ground	Ignition switch off	10 kΩ or higher

Result:

Proceed to
OK
NG

3.CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - BATTERY, BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - BATTERY, BODY GROUND)

Disconnect the O16 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
O16-8 (B) - O16-12 (E)	Always	11 to 14 V

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O16-12 (E) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

4.REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

Replace the sliding roof ECU (sliding roof drive gear sub-assembly).

Click hereVehicle Exterior>SLIDING ROOF / CONVERTIBLE>SLIDING ROOF HOUSING>DISASSEMBLY

Result:

Proceed to
NEXT

5.CHECK DTC OUTPUT

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs: 50002 123

Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes: 50001 123

OK:: DTC B1273 is not output.

Result:

Proceed to
OK
NG

END (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL