Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Turn Signal/Hazard Flasher Circuit Current Above Threshold (B150819)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System(for Gasoline Model) / Turn Signal/Hazard Flasher Circuit Current Above Threshold (B150819)

DESCRIPTION

This DTC is stored when the combination meter assembly detects a short in a turn signal light circuit.

HINT:

If there is a short in a turn signal light circuit, all of the turn signal lights in that circuit will not blink.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B150819

Turn Signal/Hazard Flasher Circuit Current Above Threshold

Diagnosis Condition:

  • Battery voltage is 10 V or more

Malfunction Status:

  • Short in turn signal light circuit
  • Harness or connector
  • Headlight assembly
  • Headlight ECU sub-assembly*
  • Side turn signal light assembly
  • Outer rear view mirror sub-assembly
  • Rear combination light assembly
  • Rear light assembly*
  • Rear combination light socket and wire
  • Rear light cord*
  • Combination meter assembly

DTC stored

-
  • *: w/ Cornering Light

WIRING DIAGRAM

LH SIDE

RH SIDE

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.

CHECK LIGHTS

(a) Inspect the illumination of each turn signal light.

Result

Proceed to

All LH turn signal lights do not blink

A

All RH turn signal lights do not blink

B
B

GO TO STEP 20

A

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Cornering Light

A

w/o Cornering Light

B
B

GO TO STEP 13

A

3.

CHECK LH SIDE LIGHTS (REAR LIGHT ASSEMBLY LH)

(a) Disconnect the P12 rear light assembly LH connector.

(b) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the rear turn signal light blink.

HINT:

If the LH side turn signal lights blink, the rear light assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 5

A

4.

CHECK REAR LIGHT CORD LH

(a) Interchange the rear light cord LH with RH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR LIGHT CORD LH

NG

REPLACE REAR LIGHT ASSEMBLY LH

5.

CHECK LH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY LH)

(a) Connect the P12 rear light assembly LH connector.

(b) Disconnect the P10 rear combination light assembly LH connector.

(c) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the rear turn signal light blink.

HINT:

If the LH side turn signal lights blink, the rear combination light assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 7

A

6.

CHECK REAR COMBINATION LIGHT SOCKET AND WIRE LH

(a) Interchange the rear combination light socket and wire LH with RH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

7.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH AND REAR LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the P12 rear light assembly LH connector.

(b) Disconnect the G15 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P10-3 (TRN), P12-3 (B) or G15-10 (TRNL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK LH SIDE LIGHTS (OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH)

(a) Connect the P10 rear combination light assembly LH connector.

(b) Connect the P12 rear light assembly LH connector.

(c) Connect the G15 combination meter assembly connector.

(d) Disconnect the I28 outer rear view mirror sub-assembly LH*1 connector.

(e) Disconnect the I29 outer rear view mirror sub-assembly LH*2 connector.

(f) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the side turn signal light blink.

HINT:

If the LH side turn signal lights blink, the outer rear view mirror sub-assembly LH is malfunctioning.

  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 10

A

9.

INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH

(a) Remove the side turn signal light assembly LH.

Click here

(b) Inspect the side turn signal light assembly LH.

Click here

OK

REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH

NG

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH

10.

CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH)

(a) Connect the I28 outer rear view mirror sub-assembly LH*1 connector.

(b) Connect the I29 outer rear view mirror sub-assembly LH*2 connector.

(c) Disconnect the A8 headlight assembly LH connector.

(d) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the headlight turn signal light blink.

HINT:

If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 12

A

11.

CHECK LH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY LH)

*a

Component without harness connected

(Headlight ECU Sub-assembly LH)

-

-

(a) Remove the headlight ECU sub-assembly LH.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-20 (TURN+) - B-13 (TURN-)

or

A8-11 (TNS) - A8-12 (GND)

Always

10 kΩ or higher
OK

REPLACE HEADLIGHT ASSEMBLY LH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

12.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

(b) Disconnect the I28 outer rear view mirror sub-assembly LH*1 connector.

(c) Disconnect the I29 outer rear view mirror sub-assembly LH*2 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A8-11 (TNS), I28-4 (B)*1, I29-4 (B)*2 or G15-11 (LL) - Body ground

Always

10 kΩ or higher
  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

CHECK LH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY LH)

(a) Disconnect the P10 rear combination light assembly LH connector.

(b) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the rear turn signal light blink.

HINT:

If the LH side turn signal lights blink, the rear combination light assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 15

A

14.

CHECK REAR COMBINATION LIGHT SOCKET AND WIRE LH

(a) Interchange the rear combination light socket and wire LH with RH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

15.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P10-3 (TRN) or G15-10 (TRNL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

CHECK LH SIDE LIGHTS (OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH)

(a) Connect the P10 rear combination light assembly LH connector.

(b) Connect the G15 combination meter assembly connector.

(c) Disconnect the I29 outer rear view mirror sub-assembly LH connector.

(d) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the side turn signal light blink.

HINT:

If the LH side turn signal lights blink, the outer rear view mirror sub-assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 18

A

17.

INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH

(a) Remove the side turn signal light assembly LH.

Click here

(b) Inspect the side turn signal light assembly LH.

Click here

OK

REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH

NG

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH

18.

CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH)

(a) Connect the I29 outer rear view mirror sub-assembly LH connector.

(b) Disconnect the A45 headlight assembly LH connector.

(c) Operate the headlight dimmer switch assembly and check that the LH side turn signal lights other than the headlight turn signal light blink.

HINT:

If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT ASSEMBLY LH

B

19.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

(b) Disconnect the I29 outer rear view mirror sub-assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A45-2 (B), I29-4 (B) or G15-11 (LL) - Body ground

Always

10 kΩ or higher
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Cornering Light

A

w/o Cornering Light

B
B

GO TO STEP 31

A

21.

CHECK RH SIDE LIGHTS (REAR LIGHT ASSEMBLY RH)

(a) Disconnect the P11 rear light assembly RH connector.

(b) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the rear turn signal light blink.

HINT:

If the RH side turn signal lights blink, the rear light assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 23

A

22.

CHECK REAR LIGHT CORD RH

(a) Interchange the rear light cord RH with LH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR LIGHT CORD RH

NG

REPLACE REAR LIGHT ASSEMBLY RH

23.

CHECK RH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY RH)

(a) Connect the P11 rear light assembly RH connector.

(b) Disconnect the P9 rear combination light assembly RH connector.

(c) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the rear turn signal light blink.

HINT:

If the RH side turn signal lights blink, the rear combination light assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 25

A

24.

CHECK REAR COMBINATION LIGHT SOCKET AND WIRE RH

(a) Interchange the rear combination light socket and wire RH with LH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

25.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH AND REAR LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the P11 rear light assembly RH connector.

(b) Disconnect the G15 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P9-3 (TRN), P11-3 (B) or G15-13 (TRNR) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

26.

CHECK RH SIDE LIGHTS (OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH)

(a) Connect the P9 rear combination light assembly RH connector.

(b) Connect the P11 rear light assembly RH connector.

(c) Connect the G15 combination meter assembly connector.

(d) Disconnect the I12 outer rear view mirror sub-assembly RH*1 connector.

(e) Disconnect the I13 outer rear view mirror sub-assembly RH*2 connector.

(f) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the side turn signal light blink.

HINT:

If the RH side turn signal lights blink, the outer rear view mirror sub-assembly RH is malfunctioning.

  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 28

A

27.

INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH

(a) Remove the side turn signal light assembly RH.

Click here

(b) Inspect the side turn signal light assembly RH.

Click here

OK

REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH

NG

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH

28.

CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH)

(a) Connect the I12 outer rear view mirror sub-assembly RH*1 connector.

(b) Connect the I13 outer rear view mirror sub-assembly RH*2 connector.

(c) Disconnect the A9 headlight assembly RH connector.

(d) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the headlight turn signal light blink.

HINT:

If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 30

A

29.

CHECK RH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY RH)

*a

Component without harness connected

(Headlight ECU Sub-assembly RH)

-

-

(a) Remove the headlight ECU sub-assembly RH.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C-20 (TURN+) - C-13 (TURN-)

or

A9-11 (TNS) - A9-12 (GND)

Always

10 kΩ or higher
OK

REPLACE HEADLIGHT ASSEMBLY RH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

30.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

(b) Disconnect the I12 outer rear view mirror sub-assembly RH*1 connector.

(c) Disconnect the I13 outer rear view mirror sub-assembly RH*2 connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A9-11 (TNS), I12-4 (B)*1, I13-4 (B)*2 or G15-7 (LR) - Body ground

Always

10 kΩ or higher
  • *1: w/o Panoramic View Monitor System
  • *2: w/ Panoramic View Monitor System
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

31.

CHECK RH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY RH)

(a) Disconnect the P9 rear combination light assembly RH connector.

(b) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the rear turn signal light blink.

HINT:

If the RH side turn signal lights blink, the rear combination light assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 33

A

32.

CHECK REAR COMBINATION LIGHT SOCKET AND WIRE RH

(a) Interchange the rear combination light socket and wire RH with LH and connect the connectors.

Click here

(b) Check that the rear turn signal light operates normally.

OK:

Rear turn signal light blinks.

OK

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

33.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P9-3 (TRN) or G15-13 (TRNR) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

34.

CHECK RH SIDE LIGHTS (OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH)

(a) Connect the P9 rear combination light assembly RH connector.

(b) Connect the G15 combination meter assembly connector.

(c) Disconnect the I13 outer rear view mirror sub-assembly RH connector.

(d) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the side turn signal light blink.

HINT:

If the RH side turn signal lights blink, the outer rear view mirror sub-assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 36

A

35.

INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH

(a) Remove the side turn signal light assembly RH.

Click here

(b) Inspect the side turn signal light assembly RH.

Click here

OK

REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH

NG

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH

36.

CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH)

(a) Connect the I13 outer rear view mirror sub-assembly RH connector.

(b) Disconnect the A44 headlight assembly RH connector.

(c) Operate the headlight dimmer switch assembly and check that the RH side turn signal lights other than the headlight turn signal light blink.

HINT:

If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT ASSEMBLY RH

B

37.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the G15 combination meter assembly connector.

(b) Disconnect the I13 outer rear view mirror sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A44-2 (B), I13-4 (B) or G15-7 (LR) - Body ground

Always

10 kΩ or higher
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Turn Signal Light Circuit Current Below Threshold (B150718)

    Customize Parameters

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