DTC B1507: Open in Turn Signal Circuit; DTC B1508: Short in Turn Signal / Hazard Flasher Circuit: Procedure

1. Inspect the illumination of each turn signal light.

   Result

   Result	Proceed to
   Turn signal lights for one side do not illuminate.	A
   Front turn signal light does not illuminate.	B
   Rear turn signal light does not illuminate.	C
   Side turn signal light does not illuminate.	D

B → See step   3 

C → See step   4 

D → See step   5 

A: Go to next step 

1. Disconnect the I17 combination meter assembly connector.
2. Disconnect the 3A instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   I17-7 (LL) - 3A-20	Always	Below 1 Ω

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   I17-13 (LR) - 3A-37	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   I17-7 (LL) - Body ground	Always	10 kΩ or higher

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   I17-13 (LR) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   6 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the A77*1 or A74*2 headlight assembly connector.
   • *1: for RH
   • *2: for LH
2. Disconnect the 3D instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   A74-1 (B) - 3D-10	Always	Below 1 Ω
   A74-3 (E) - Body ground	Always	Below 1 Ω

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   A77-1 (B) - 3D-5	Always	Below 1 Ω
   A77-3 (E) - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   A74-1 (B) - Body ground	Always	10 kΩ or higher

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   A77-1 (B) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   6 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the T13*1 or T8*2 rear combination light assembly connector.
   • *1: for RH
   • *2: for LH
2. Disconnect the 3C and 3D instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   T8-1 (B) - 3C-22	Always	Below 1 Ω
   T8-2 (E) - Body ground	Always	Below 1 Ω

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   T13-1 (B) - 3C-19	Always	Below 1 Ω
   T13-2 (E) - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   T8-1 (B) - Body ground	Always	10 kΩ or higher

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   T13-1 (B) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   6 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the J7*1 or K7*2 outer rear view mirror assembly connector.
   • *1: for RH
   • *2: for LH
2. Disconnect the 3A and 3B instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   K7-10 (B) - 3A-40	Always	Below 1 Ω
   K7-11 (E) - Body ground	Always	Below 1 Ω

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   J7-10 (B) - 3B-32	Always	Below 1 Ω
   J7-11 (E) - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   FOR LH
   
   

   Tester Connection	Condition	Specified Condition
   K7-10 (B) - Body ground	Always	10 kΩ or higher

   FOR RH
   
   

   Tester Connection	Condition	Specified Condition
   J7-10 (B) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   6 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Refer to REMOVAL .
   Fig 1: Instrument Panel Junction Block Assembly Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-37 - 3D-5	Always	Below 1 Ω
   3A-37 - 3C-19	Always	Below 1 Ω
   3A-37 - 3B-32	Always	Below 1 Ω
   3A-20 - 3D-10	Always	Below 1 Ω
   3A-20 - 3C-22	Always	Below 1 Ω
   3A-40 - 3A-20	Always	Below 1 Ω

NG → See step   8 

OK → See step   7