Daytime Running Light Relay Circuit [10/2014 - 10/2015]: Procedure

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   for HID Headlight	A
   for Halogen Headlight	B

Result: 

B 

See step  10

Result: 

A 

See step  2

1. Check the operation of the parking lights.

   OK

   The parking lights operate normally.

Result: 

NG 

GO TO PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] )

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the daytime running lights illuminate.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Daytime Running Light	Daytime running lights	ON/OFF	-

   OK

   The daytime running lights illuminate.

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] )

Result: 

NG 

See step  4

1. Using a voltmeter, check the signal reading of the engine room junction block assembly (Refer to ON-VEHICLE INSPECTION [10/2014 - 10/2015] ).

   OK

   Output signal reading is normal.

Result: 

NG 

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) 

(Refer to PROCEDURE - Step 2 )

Result: 

OK 

See step  5

Refer to Front Fog Light Circuit [10/2014 - 10/2015] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the 3D main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1F-6 (DRLS) - 3D-25	Always	Below 1 Ω
   3D-25 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Remove the instrument panel junction block assembly (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3D-25 - MB-25 (DRL)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  8

1. Disconnect the 1G engine room junction block assembly connector.
2. Disconnect the A14 headlight assembly LH connector.
3. Disconnect the A42 headlight assembly RH connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1G-8 (LDRL) - A14-1 (B)	Always	Below 1 Ω
   1G-8 (LDRL) - A42-1 (B)	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Replace the engine room junction block assembly with a new or known good one (Refer to REMOVAL [10/2014 - ] ).
2. Check that the daytime running lights operate normally.

   OK

   The daytime running lights operate normally.

Result: 

OK 

END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

(Refer to REMOVAL [10/2014 - ] )

1. Check the operation of the high beam headlights.

   OK

   The high beam headlights operate normally.

Result: 

NG 

GO TO PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] )

Result: 

OK 

See step  11

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the daytime running lights illuminate.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Daytime Running Light	Daytime running lights	ON/OFF	-

   OK

   The daytime running lights illuminate.

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] )

Result: 

NG 

See step  12

1. Using a voltmeter, check the signal reading of the engine room junction block assembly (Refer to ON-VEHICLE INSPECTION [10/2014 - 10/2015] ).

   OK

   Output signal reading is normal.

Result: 

NG 

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) 

(Refer to PROCEDURE - Step 2 )

Result: 

OK 

See step  13

Refer to Front Fog Light Circuit [10/2014 - 10/2015] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  14

1. Disconnect the 3D main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1F-14 (DRLS) - 3D-25	Always	Below 1 Ω
   3D-25 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  15

1. Remove the instrument panel junction block assembly (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3D-25 - MB-25 (DRL)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  16

1. Replace the engine room junction block assembly with a new or known good one (Refer to REMOVAL [10/2014 - ] ).
2. Check that the daytime running lights operate normally.

   OK

   The daytime running lights operate normally.

Result: 

OK 

END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

(Refer to REMOVAL [10/2014 - ] )