DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2021 - 10/2022]: Procedure

1. Inspect the illumination of each turn signal light.

   Result

   Result	Proceed to
   Front turn signal light LH does not blink.	A
   Front turn signal light RH does not blink.	B
   Side turn signal light LH does not blink.	C
   Side turn signal light RH does not blink.	D
   Rear turn signal light LH and side turn signal light LH do not blink.	E
   Rear turn signal light RH and side turn signal light RH do not blink.	F
   Rear turn signal light LH does not blink.	G
   Rear turn signal light RH does not blink.	H

Result: 

B 

See step  3

Result: 

C 

See step  4

Result: 

D 

See step  6

Result: 

E 

See step  8

Result: 

F 

See step  9

Result: 

G 

See step  10

Result: 

H 

See step  11

Result: 

A 

See step  2

1. Disconnect the G19 combination meter assembly connector.
2. Disconnect the A123 front turn signal light socket LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G19-1 (LL) - A123-4 (B)	Always	Below 1 Ω
   A123-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH. Refer to  DISASSEMBLY [12/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the G19 combination meter assembly connector.
2. Disconnect the A122 front turn signal light socket RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G19-1 (LL) - A122-4 (B)	Always	Below 1 Ω
   A122-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH. Refer to  DISASSEMBLY [12/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Refer to INSPECTION [06/2020 - ]

Result

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

See step  5

Refer to INSPECTION [06/2020 - ]

Result

Result: 

OK 

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to  REMOVAL [06/2020 - ] 

Result: 

NG 

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [06/2020 - ] 

Refer to INSPECTION [06/2020 - ]

Result

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

See step  7

Refer to INSPECTION [06/2020 - ]

Result

Result: 

OK 

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [06/2020 - ] 

Result: 

NG 

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [06/2020 - ] 

1. Disconnect the N18 rear combination light socket and wire LH connector.
2. Disconnect the G19 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N18-4 (TRN) - G19-5 (TRNL)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the M14 rear combination light socket and wire RH connector.
2. Disconnect the G19 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M14-4 (TRN) - G19-6 (TRNR)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the N18 rear combination light socket and wire LH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Rear Combination Light Socket and Wire LH)

2. Apply auxiliary battery voltage to the rear combination light socket and wire LH and check that the light illuminates.

   OK

   Condition	Specified Condition
   Auxiliary battery positive (+) → Terminal 4 (TRN) Auxiliary battery negative (-) → Terminal 3 (E)	Turn signal light illuminates

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [06/2020 - ] 

1. Disconnect the M14 rear combination light socket and wire RH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Rear Combination Light Socket and Wire RH)

2. Apply auxiliary battery voltage to the rear combination light socket and wire RH and check that the light illuminates.

   OK

   Condition	Specified Condition
   Auxiliary battery positive (+) → Terminal 4 (TRN) Auxiliary battery negative (-) → Terminal 3 (E)	Turn signal light illuminates

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [06/2020 - ]