Daytime Running Light Relay Circuit [04/2013 - 10/2016]: Procedure

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.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Daytime Running Light	Daytime running lights	ON/OFF	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Daytime Running Light

   OK

   The daytime running lights illuminate.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2013 - 06/2014]  , or refer to  PROBLEM SYMPTOMS TABLE [06/2014 - 08/2015]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2015 - 10/2016] 

Result: 

NG 

See step  2

1. Using a voltmeter, check the signal reading of the semiconductor pwr integration ECU.

   Refer to ON-VEHICLE INSPECTION [04/2013 - ]

   OK

   Output signal reading is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSPECT SEMICONDUCTOR PWR INTEGRATION ECU (RESULTS OF SIGNAL READING CHECK). Refer to  PROCEDURE - Step 2 

Result: 

OK 

See step  3

1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 junction block assembly.

   Refer to REMOVAL [04/2013 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without semiconductor pwr integration ECU connected (No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly)

   -

   -

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2B-1 (BATT) - Body ground	Always	11 to 14 V
   2A-1 (ALT) - Body ground	Always	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2D-14 (GND1) - Body ground	Always	Below 1 Ω
   2G-5 (GND2) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the 4C instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2D-9 (DRLS) - 4C-25	Always	Below 1 Ω
   4C-25 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [04/2013 - ]

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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4C-25 - MB-25 (DRLE)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

Result: 

OK 

See step  6

1. Replace the semiconductor pwr integration ECU with a new or known good one.

   Refer to REMOVAL [04/2013 - ]

2. Check that the daytime running lights operate normally.

   OK

   The daytime running lights operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (SEMICONDUCTOR PWR INTEGRATION ECU WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [04/2013 - ]