RM38T0EC _58 Vehicle Interior _112288 LIGHTING (INT) _0510959 LIGHTING SYSTEM J

LIGHTING (INT)  LIGHTING SYSTEM  Back Door Courtesy Switch Circuit  


DESCRIPTION

The main body ECU (multiplex network body ECU) receives a back door open/closed signal from the back door courtesy light switch (back door lock assembly).

WIRING DIAGRAM

E432340E11
1.615,1.406 3.479,1.792 1.865,0.385 10 false Back Door Lock with Courtesy Light Switch Assembly 1.604,1.24 2.063,1.438 0.458,0.198 10 false U4 2.729,0.865 3.188,1.063 0.458,0.198 10 false D+ 1.917,0.865 2.375,1.063 0.458,0.198 10 false ACT- 2.563,2.427 3.021,2.625 0.458,0.198 10 false CTYO 1.573,2.844 2.031,3.042 0.458,0.198 10 false U21 5.479,2.094 5.938,2.292 0.458,0.198 10 false MB 4.604,1.604 6.052,2.01 1.448,0.406 10 false Power Distribution Box Assembly 4.604,1.427 5.063,1.625 0.458,0.198 10 false 8F 4.438,0.854 4.896,1.052 0.458,0.198 10 false 2 5.885,0.854 6.344,1.052 0.458,0.198 10 false 19 5.479,2.26 7.156,2.646 1.677,0.385 10 false Main Body ECU (Multiplex Network Body ECU) 1.573,3.01 5.552,3.208 3.979,0.198 10 false Multiplex Network Door ECU 3.031,2.333 3.49,2.531 0.458,0.198 10 false 5 3.042,0.854 3.5,1.052 0.458,0.198 10 false 3 1.729,0.865 2.188,1.063 0.458,0.198 10 false 2 6.115,0.792 6.625,1 0.51,0.208 10 false BCTY 6.531,0.552 6.844,0.75 0.313,0.198 10 false +B 4.698,3.198 6.958,3.458 2.26,0.26 10 false *1: w/ Power Back Door System 3.563,2.323 4.021,2.521 0.458,0.198 10 false *1 3.5,0.802 3.958,1 0.458,0.198 10 false *2 4.698,3.479 6.958,3.74 2.26,0.26 10 false *2: w/o Power Back Door System

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1

*1: w/ Smart Entry and Start System



PROCEDURE

1.READ VALUE USING GTS
a.

Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Back Door Courtesy Switch Status Back door courtesy switch signal CLOSE or OPEN CLOSE: Back door closed
OPEN: Back door open 		-
Body Electrical > Main Body > Data List
Tester Display
Back Door Courtesy Switch Status
50003 449 34
OK:

Normal conditions listed above are displayed.



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Interior>LIGHTING (INT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE


NG

2.INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)
2.INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

Click hereVehicle Interior>LIGHTING (INT)>BACK DOOR COURTESY SWITCH>INSPECTION

Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

NG

REPLACE BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

Click hereVehicle Interior>LIGHTING (INT)>BACK DOOR COURTESY SWITCH>REMOVAL


3.CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)
a.

Disconnect the 8F power distribution box assembly connector.


b.

Disconnect the U21 multiplex network door ECU connector.*1

*1: w/ Power Back Door System



c.

Disconnect the U4 back door lock with courtesy light switch assembly connector.*1

*1: w/o Power Back Door System



d.

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

Standard Resistance:
w/ Power Back Door System
Tester Connection Condition Specified Condition
U21-5 (CTYO) - 8F-2 Always Below 1 Ω
8F-2 - Body ground Always 10 kΩ or higher


w/o Power Back Door System
Tester Connection Condition Specified Condition
U4-3 (D+) - 8F-2 Always Below 1 Ω
U4-2 (ACT-) - Body ground Always Below 1 Ω
U4-3 (D+) - Body ground Always 10 kΩ or higher
8F-2 - Body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



OK

4.INSPECT POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT POWER DISTRIBUTION BOX ASSEMBLY
E438203C53
1.469,0.177 1.844,0.406 0.375,0.229 4.635,0.271 5.01,0.5 0.375,0.229 5.948,0.885 5.813,1.302 true 0.26,0.104 0.5,0.302 0.24,0.198 10 false *a 5.5,1.354 5.938,1.531 0.438,0.177 10 false BCTY 1.583,0.229 1.917,0.396 0.333,0.167 10 false 8F 4.74,0.313 5.073,0.479 0.333,0.167 10 false MB
*a Component without harness connected
(Power Distribution Box Assembly) 		- -


a.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

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


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
8F-2 - MB-19 (BCTY) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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