RM35X0E _59 Vehicle Exterior _079256 LIGHTING (EXT) _0396321 LIGHTING SYSTEM(w/ Headlight ECU) C

LIGHTING (EXT)  LIGHTING SYSTEM(w/ Headlight ECU)  B1244  Light Sensor Circuit  


DESCRIPTION

The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B1244 Light Sensor Circuit
Detection condition:

The engine switch is on (IG)


Malfunction status:

Either of the following conditions is met:

-

Malfunction in automatic light control sensor

-

Open or short in automatic light control sensor circuit



Malfunction duration:

5 seconds or more


·

Automatic light control sensor

·

Harness or connector

·

Main body ECU (multiplex network body ECU)


Main Body -

WIRING DIAGRAM

E367076E24
0.323,3.635 0.635,3.833 0.313,0.198 10 false Q2 0.323,3.813 2.469,4.125 2.146,0.313 10 false Automatic Light Control Sensor 2.01,0.969 2.323,1.167 0.313,0.198 10 false 1 2.021,2.063 2.333,2.26 0.313,0.198 10 false 4 2.021,2.729 2.333,2.927 0.313,0.198 10 false 2 1.552,0.958 2.177,1.208 0.625,0.25 10 false CLTB 1.583,2.74 2.208,2.99 0.625,0.25 10 false CLTE 1.583,2.073 2.208,2.323 0.625,0.25 10 false CLTS 4.865,0.969 5.49,1.219 0.625,0.25 10 false CLTB 4.854,2.052 5.479,2.302 0.625,0.25 10 false CLTS 4.854,2.729 5.479,2.979 0.625,0.25 10 false CLTE 4.625,0.958 4.938,1.156 0.313,0.198 10 false 23 4.625,2.042 4.938,2.24 0.313,0.198 10 false 24 4.615,2.719 4.927,2.917 0.313,0.198 10 false 25 4.969,3.635 5.281,3.833 0.313,0.198 10 false N19 4.979,3.813 6.625,4.25 1.646,0.438 10 false Main Body ECU (Multiplex Network Body ECU) 5.469,1.333 6.094,1.583 0.625,0.25 10 false +B

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Main Body / Clear DTCs.


e.

Clear the DTCs.

Body Electrical > Main Body > Clear DTCs
50002 123

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Wait 10 seconds or more.


d.

Turn the GTS on.


e.

Enter the following menus: Body Electrical / Main Body / Trouble Codes.


f.

Check for DTCs.

Body Electrical > Main Body > Trouble Codes
50001 123
OK:

DTC B1244 is not output.



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

3.READ VALUE USING GTS
3.READ VALUE USING GTS
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Main Body / Data List.


e.

According to the display on the GTS, read the Data List and check that the value of Light Sensor Illuminance changes while performing the following:

i.

Cover the automatic light control sensor with an opaque object.


ii.

Slowly move the opaque object to uncover and then cover the automatic light control sensor.

Body Electrical > Main Body > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Light Sensor Illuminance Light control sensor illuminance 0 to 8191 lx or SensorFail Value is output according to ambient light level -
Body Electrical > Main Body > Data List
Tester Display
Light Sensor Illuminance
50003 123 279
OK:

The value changes according to the amount the automatic light control sensor is covered.




Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

4.CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
4.CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
a.

Disconnect the Q2 automatic light control sensor connector.


b.

Disconnect the N19 main body ECU (multiplex network body ECU) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Q2-1 (CLTB) - N19-23 (CLTB) Always Below 1 Ω
Q2-4 (CLTS) - N19-24 (CLTS) Always Below 1 Ω
Q2-2 (CLTE) - N19-25 (CLTE) Always Below 1 Ω
Q2-1 (CLTB) or N19-23 (CLTB) - Body ground Always 10 kΩ or higher
Q2-4 (CLTS) or N19-24 (CLTS) - Body ground Always 10 kΩ or higher
Q2-2 (CLTE) or N19-25 (CLTE) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
E364086C27
0.229,0.99 0.635,1.24 0.406,0.25 2.635,1.677 2.448,1.677 2.448,1.677 1.917,1.292 true 2.302,2.01 2.115,2.01 2.115,2.01 1.708,1.271 true 0.208,0.135 0.521,0.292 0.313,0.156 10 false *a 0.313,1.031 0.625,1.188 0.313,0.156 10 false N19 2.677,1.563 3.073,1.719 0.396,0.156 10 false CLTB 2.344,1.906 2.74,2.063 0.396,0.156 10 false CLTE
*a Component with harness connected
(Main Body ECU (Multiplex Network Body ECU))


a.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
N19-23 (CLTB) - N19-25 (CLTE) Engine switch off Below 1 V
Engine switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

6.INSPECT AUTOMATIC LIGHT CONTROL SENSOR

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL