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

LIGHTING (INT)  LIGHTING SYSTEM  IG Signal Circuit  


DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

E438201E13
0.5,0.5 1.375,0.906 0.875,0.406 10 false from Auxiliary Battery 1.802,0.656 2.906,0.885 1.104,0.229 10 false INP STD NO. 3 4.083,1.031 4.823,1.26 0.74,0.229 10 false IGR NO. 2 4.729,0.656 5.885,0.865 1.156,0.208 10 false ECU-IGR NO. 2 6.083,0.438 6.5,0.625 0.417,0.188 10 false IGR 0.135,1.125 2.156,2.031 2.021,0.906 10 false from Certification ECU (Smart Key ECU Assembly)*1 or Ignition or Starter Switch Assembly*2 6.083,1.5 6.563,1.719 0.479,0.219 10 false GND1 5.75,1.5 6.052,1.74 0.302,0.24 10 false MB 5.75,0.521 6.052,0.76 0.302,0.24 10 false MB 3.281,0.521 3.552,0.771 0.271,0.25 10 false 8K 3.281,1.115 3.552,1.365 0.271,0.25 10 false 8C 3.281,1.938 3.552,2.188 0.271,0.25 10 false 8C 3.313,0.333 3.594,0.573 0.281,0.24 10 false 1 3.271,0.917 3.552,1.156 0.281,0.24 10 false 17 3.281,1.76 3.563,2 0.281,0.24 10 false 41 3.635,2.646 6.177,2.927 2.542,0.281 10 false Power Distribution Box Assembly 5.5,3.042 7.135,3.51 1.635,0.469 10 false Main Body ECU (Multiplex Network Body ECU) 5.76,0.344 6.042,0.583 0.281,0.24 10 false 27 5.75,1.323 6.031,1.563 0.281,0.24 10 false 13 6.083,1.948 6.563,2.167 0.479,0.219 10 false GND2 5.75,1.76 6.052,2 0.302,0.24 10 false 14 5.76,1.938 6.063,2.177 0.302,0.24 10 false MB 3.281,1.5 3.552,1.75 0.271,0.25 10 false 8B 3.271,1.323 3.552,1.563 0.281,0.24 10 false 36 0.26,2.781 2.667,3.052 2.406,0.271 10 false *1: w/ Smart Entry and Start System 0.26,3.198 2.667,3.469 2.406,0.271 10 false *2: w/o Smart Entry and Start System

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

First, check for smart entry and start system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.*1

for HEV Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING


·

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
IGR Power Ignition switch ON signal OFF or ON OFF: Ignition switch off
ON: Ignition switch ON 		-
Body Electrical > Main Body > Data List
Tester Display
IGR Power
50003 449 122
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.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE)
2.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE)
a.

Disconnect the 8C and 8K power distribution box assembly connectors.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
8K-1 - Body ground Ignition switch off 11 to 14 V
8C-17 - Body ground Ignition switch off Below 1 V
8C-17 - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)
a.

Disconnect the 8B and 8C power distribution box assembly connectors.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
8B-36 - Body ground Always Below 1 Ω
8C-41 - Body ground Always Below 1 Ω



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
E438202C12
1.74,0.25 2.177,0.552 0.438,0.302 5,0.24 5.438,0.542 0.438,0.302 4.99,2.146 5.427,2.448 0.438,0.302 1.75,2.063 2.188,2.365 0.438,0.302 1.875,0.313 2.188,0.51 0.313,0.198 10 false 8C 5.135,0.313 5.448,0.51 0.313,0.198 10 false 8B 5.125,2.25 5.438,2.448 0.313,0.198 10 false MB 1.885,2.156 2.198,2.354 0.313,0.198 10 false 8K 0.177,0.177 0.49,0.375 0.313,0.198 10 false *a
*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
8B-36 - MB-13 (GND1) Always Below 1 Ω
8C-41 - MB-14 (GND2) Always Below 1 Ω
8K-1 - MB-27 (IGR) Auxiliary battery not connected to 8C-17 - 8B-36 or 8C-41 10 kΩ or higher
8K-1 - MB-27 (IGR) Auxiliary battery positive (+) → 8C-17
Auxiliary battery negative (-) → 8B-36 or 8C-41 		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