LIGHTING (EXT) LIGHTING SYSTEM Taillight Relay Circuit | Toyota Corolla/Altis NZE17/ZRE17 2017 Service Manual

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

WIRING DIAGRAM

0.417,0.458 1.26,0.698 0.844,0.24 10 false from Battery 2.073,0.635 2.594,0.865 0.521,0.229 10 false ALT 0.271,1.365 2.375,1.771 2.104,0.406 10 false to Headlight Assembly LH and RH (Clearance Lights) 0.094,2.073 2.365,2.677 2.271,0.604 10 false to Rear Combination Light Assembly LH and RH (Taillights), Rear Light Assembly LH (Taillight) 0.104,3.073 2.438,3.563 2.333,0.49 10 false to Rear Light Assembly RH (Taillight), License Plate Lights 3.531,3.521 5.146,3.969 1.615,0.448 10 false Instrument Panel Junction Block Assembly 5.448,3.688 5.833,3.927 0.385,0.24 10 false MB 5.448,3.854 7.115,4.26 1.667,0.406 10 false Main Body ECU (Multiplex Network Body ECU) 6.365,0.458 6.885,0.688 0.521,0.229 10 false TRLY 5.354,1.021 5.76,1.25 0.406,0.229 10 false TAIL 4.604,1.167 5.01,1.396 0.406,0.229 10 false TAIL 3.271,0.479 3.677,0.708 0.406,0.229 10 false 3B 3.271,1.365 3.677,1.594 0.406,0.229 10 false 3A 3.281,3.063 3.688,3.292 0.406,0.229 10 false 3E 3.302,0.281 3.51,0.5 0.208,0.219 10 false 1 3.313,1.167 3.521,1.385 0.208,0.219 10 false 7 3.281,1.865 3.49,2.083 0.208,0.219 10 false 17 3.281,2.854 3.49,3.073 0.208,0.219 10 false 32 6.115,0.365 6.344,0.594 0.229,0.229 10 false 14 3.271,2.073 3.677,2.302 0.406,0.229 10 false 3E

CAUTION / NOTICE / HINT

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

PROCEDURE

1.PERFORM ACTIVE TEST USING GTS

a.

Connect the GTS to the DLC3.

b.

Turn the ignition switch to ON.

c.

Turn the GTS on.

d.

Enter the following menus: Body Electrical / Main Body / Active Test.

e.

Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Taillight Relay	Taillight relay	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Taillight Relay

50004 123 13

OK:: Taillight relay operates. (Taillights illuminate.)

Result:

Proceed to
OK
NG

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE

NG

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

a.

Disconnect the 3B instrument panel junction block assembly connector.

b.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3B-1 - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

OK

3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

0.833,0.365 1.146,0.542 0.313,0.177 2.938,0.375 3.24,0.563 0.302,0.188 5.75,0.406 6.073,0.594 0.323,0.188 3.281,2.125 3.604,2.375 0.323,0.25 3.063,3.271 3.271,2.885 false 0.229,0.177 0.542,0.375 0.313,0.198 10 *a 0.906,0.365 1.219,0.563 0.313,0.198 10 3B 3.01,0.375 3.323,0.573 0.313,0.198 10 3A 5.833,0.406 6.146,0.604 0.313,0.198 10 3E 3.333,2.146 3.646,2.344 0.313,0.198 10 MB 2.854,3.313 3.469,3.51 0.615,0.198 10 TRLY

*a

Component without harness connected
(Instrument Panel Junction Block Assembly)

-

a.

Remove the instrument panel junction block assembly.

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

b.

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

c.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3A-7 - Battery negative (-) terminal	Battery positive (+) → 3B-1 Battery negative (-) → MB-14 (TRLY)	11 to 14 V
3E-17 - Battery negative (-) terminal	Battery positive (+) → 3B-1 Battery negative (-) → MB-14 (TRLY)	11 to 14 V
3E-32 - Battery negative (-) terminal	Battery positive (+) → 3B-1 Battery negative (-) → MB-14 (TRLY)	11 to 14 V

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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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