Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000025DLX
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for TMC Made): Taillight Relay Circuit; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

WIRING DIAGRAM

for Hatchback

for Sedan

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    for HV Model:Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    for Gasoline Model:Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function (Gasoline Model, except TMMMS Made)): REGISTRATION

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; NETWORKING: CXPI COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Taillight / Clearance Light

Taillights/parking lights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Taillight / Clearance Light

OK:

Taillights, accessory lights*1, parking lighst*2 and side marker lights illuminate.

  • *1: w/ Accessory Light
  • *2: for Sedan, for Bulb Type Turn Signal Light
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8M power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

8M-1 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Hatchback

A

for Sedan

B

B

GO TO STEP 16

A

4.

CHECK HARNESS AND CONNECTOR (TAILLIGHT RELAY CIRCUIT)

(a) Disconnect the 8H power distribution box assembly connector.

(b) Disconnect the O42 rear combination light cord LH connector.

(c) Disconnect the O43 rear combination light cord RH connector.

(d) Disconnect the V8 rear light socket and wire LH connector.

(e) Disconnect the V5 rear light socket and wire RH connector.

(f) Disconnect the R9 license plate light assembly LH connector.

(g) Disconnect the R8 license plate light assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8H-15 - O42-2 (TL)

Always

Below 1 Ω

8H-15 or O42-2 (TL) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Connect the 8M power distribution box assembly connector.

(b) Connect the 8H power distribution box assembly connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O42-2 (TL) - Body ground

Ignition switch off

11 to 14 V

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

6.

CHECK REAR COMBINATION LIGHT CORD LH

(a) Connect the O42 rear combination light cord LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O43-2 (TL), V8-1 (B), V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

NG

GO TO STEP 15

OK

7.

CHECK REAR COMBINATION LIGHT CORD RH

(a) Connect the O43 rear combination light cord RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V8-1 (B), V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

NG

GO TO STEP 14

OK

8.

CHECK REAR LIGHT SOCKET AND WIRE LH

(a) Connect the V8 rear light socket and wire LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

NG

GO TO STEP 13

OK

9.

CHECK REAR LIGHT SOCKET AND WIRE RH

(a) Connect the V5 rear light socket and wire RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

NG

GO TO STEP 12

OK

10.

CHECK LICENSE PLATE LIGHT ASSEMBLY LH

(a) Connect the R9 license plate light assembly LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R8-2 (B) - Body ground

Always

11 to 14 V

NG

REPLACE LICENSE PLATE LIGHT ASSEMBLY LH

OK

11.

CHECK LICENSE PLATE LIGHT ASSEMBLY RH

(a) Disconnect the R9 license plate light assembly LH connector.

(b) Connect the R8 license plate light assembly RH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R9-2 (B) - Body ground

Always

11 to 14 V

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE LICENSE PLATE LIGHT ASSEMBLY RH

12.

CHECK REAR LIGHT LENS AND BODY RH

(a) Disconnect the rear light lens and body RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

OK

REPLACE REAR LIGHT LENS AND BODY RH

NG

REPLACE REAR LIGHT SOCKET AND WIRE RH

13.

CHECK REAR LIGHT LENS AND BODY LH

(a) Disconnect the rear light lens and body LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

OK

REPLACE REAR LIGHT LENS AND BODY LH

NG

REPLACE REAR LIGHT SOCKET AND WIRE LH

14.

CHECK REAR COMBINATION LIGHT LENS AND BODY RH

(a) Disconnect the rear combination light lens and body RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V8-1 (B), V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY RH

NG

REPLACE REAR COMBINATION LIGHT CORD RH

15.

CHECK REAR COMBINATION LIGHT LENS AND BODY LH

(a) Disconnect the rear combination light lens and body LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O43-2 (TL), V8-1 (B), V5-1 (B), R9-2 (B) or R8-2 (B) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY LH

NG

REPLACE REAR COMBINATION LIGHT CORD LH

16.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Front Turn Signal Light or w/ Accessory Light

A

for LED Type Front Turn Signal Light or w/o Accessory Light

B

B

GO TO STEP 27

A

17.

CHECK HARNESS AND CONNECTOR (TAILLIGHT RELAY CIRCUIT)

(a) Disconnect the 8F power distribution box assembly connector.

(b) Disconnect the A134 headlight unit assembly LH connector.*1

(c) Disconnect the A132 headlight unit assembly RH connector.*1

(d) Disconnect the A26 headlight unit assembly LH connector.*1

(e) Disconnect the A25 headlight unit assembly RH connector.*1

(f) Disconnect the A120 LED illumination light LH connector.*2

(g) Disconnect the A119 LED illumination light RH connector.*2

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-20 - A134-3 (B)*1

Always

Below 1 Ω

8F-20 - A120-1 (TAIL)*2

Always

Below 1 Ω

8F-20, A134-3 (B)*1 or A120-1(TAIL)*2 - Body ground

Always

10 kΩ or higher

  • *1: for Bulb Type Front Turn Signal Light
  • *2: w/ Accessory Light
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

18.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Connect the 8M power distribution box assembly connector.

(b) Connect the 8F power distribution box assembly connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A134-3 (B) - Body ground*1

Ignition switch off

11 to 14 V

A120-1 (TAIL) - Body ground*2

Ignition switch off

11 to 14 V

  • *1: for Bulb Type Front Turn Signal Light
  • *2: w/ Accessory Light
NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

19.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Front Turn Signal Light

A

for LED Type Front Turn Signal Light

B

B

GO TO STEP 25

A

20.

CHECK HEADLIGHT UNIT ASSEMBLY LH

(a) Connect the 8F power distribution box assembly connector.

(b) Connect the A134 headlight unit assembly LH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A132-3 (B), A26-2 (B) or A25-2 (B) - Body ground

Always

11 to 14 V

NG

REPLACE HEADLIGHT UNIT ASSEMBLY LH

OK

21.

CHECK HEADLIGHT UNIT ASSEMBLY RH

(a) Connect the A132 headlight unit assembly RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A26-2 (B) or A25-2 (B) - Body ground

Always

11 to 14 V

NG

REPLACE HEADLIGHT UNIT ASSEMBLY RH

OK

22.

CHECK HEADLIGHT UNIT ASSEMBLY LH

(a) Connect the A26 headlight unit assembly LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A25-2 (B) - Body ground

Always

11 to 14 V

NG

REPLACE HEADLIGHT UNIT ASSEMBLY LH

OK

23.

CHECK HEADLIGHT UNIT ASSEMBLY RH

(a) Disconnect the A26 headlight unit assembly LH connector..

(b) Connect the A25 headlight unit assembly RH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A26-2 (B) - Body ground

Always

11 to 14 V

NG

REPLACE HEADLIGHT UNIT ASSEMBLY RH

OK

24.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Accessory Light

A

w/o Accessory Light

B

A

GO TO STEP 25

B

GO TO STEP 27

25.

CHECK LED ILLUMINATION LIGHT LH

(a) Connect the 8F power distribution box assembly connector.

(b) Connect the A120 LED illumination light LH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A119-1 (TAIL) - Body ground

Always

11 to 14 V

NG

REPLACE LED ILLUMINATION LIGHT LH

OK

26.

CHECK LED ILLUMINATION LIGHT RH

(a) Disconnect the A120 LED illumination light LH connector.

(b) Connect the A119 LED illumination light RH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A120-1 (TAIL) - Body ground

Always

11 to 14 V

OK

GO TO STEP 27

NG

REPLACE LED ILLUMINATION LIGHT RH

27.

CHECK HARNESS AND CONNECTOR (TAILLIGHT RELAY CIRCUIT)

(a) Disconnect the 8H power distribution box assembly connector.

(b) Disconnect the O113 license plate light assembly LH connector.

(c) Disconnect the O110 rear light socket and wire LH connector.*1

(d) Disconnect the O109 rear light socket and wire RH connector.*1

(e) Disconnect the O104 rear combination light cord LH connector.*1

(f) Disconnect the O103 rear combination light cord RH connector.*1

(g) Disconnect the O104 rear combination light assembly LH connector.*2

(h) Disconnect the O103 rear combination light assembly RH connector.*2

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8H-15 - O113-1 (B)

Always

Below 1 Ω

8H-15 or O113-1 (B) - Body ground

Always

10 kΩ or higher

  • *1: for LED Type Rear Side Marker Light
  • *2: for Bulb Type Rear Side Marker Light
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

28.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Connect the 8M power distribution box assembly connector.

(b) Connect the 8H power distribution box assembly connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O113-1 (B) - Body ground

Ignition switch off

11 to 14 V

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

29.

CHECK LICENSE PLATE LIGHT ASSEMBLY LH

(a) Connect the O113 license plate light assembly LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O110-3 (B)*, O109-3 (B)*, O104-1 (TL) or O103-1 (TL) - Body ground

Always

11 to 14 V

  • *: for LED Type Rear Side Marker Light
NG

REPLACE LICENSE PLATE LIGHT ASSEMBLY LH

OK

30.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for LED Type Rear Side Marker Light

A

for Bulb Type Rear Side Marker Light

B

B

GO TO STEP 41

A

31.

CHECK REAR LIGHT SOCKET AND WIRE LH

(a) Connect the O110 rear light socket and wire LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O109-3 (B), O104-1 (TL) or O103-1 (TL) - Body ground

Always

11 to 14 V

NG

GO TO STEP 40

OK

32.

CHECK REAR LIGHT SOCKET AND WIRE RH

(a) Connect the O109 rear light socket and wire RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) or O103-1 (TL) - Body ground

Always

11 to 14 V

NG

GO TO STEP 39

OK

33.

CHECK REAR COMBINATION LIGHT CORD LH

(a) Connect the O104 rear combination light cord LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O103-1 (TL) - Body ground

Always

11 to 14 V

NG

GO TO STEP 37

OK

34.

CHECK REAR COMBINATION LIGHT CORD RH

(a) Disconnect the O104 rear combination light cord LH connector.

(b) Connect the O103 rear combination light cord RH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) - Body ground

Always

11 to 14 V

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

35.

CHECK REAR COMBINATION LIGHT LENS AND BODY RH

(a) Disconnect the rear combination light lens and body RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY RH

NG

36.

CHECK REAR COMBINATION LIGHT LED RH

(a) Disconnect the rear combination light LED RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LED RH

NG

REPLACE REAR COMBINATION LIGHT CORD RH

37.

CHECK REAR COMBINATION LIGHT LENS AND BODY LH

(a) Disconnect the rear combination light lens and body LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O103-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY LH

NG

38.

CHECK REAR COMBINATION LIGHT LED LH

(a) Disconnect the rear combination light LED LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O103-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR COMBINATION LIGHT LED LH

NG

REPLACE REAR COMBINATION LIGHT CORD LH

39.

CHECK REAR LIGHT LENS AND BODY RH

(a) Disconnect the rear light lens and body RH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) or O103-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR LIGHT LENS AND BODY RH

NG

REPLACE REAR LIGHT SOCKET AND WIRE RH

40.

CHECK REAR LIGHT LENS AND BODY LH

(a) Disconnect the rear light lens and body LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O109-3 (B), O104-1 (TL) or O103-1 (TL) - Body ground

Always

11 to 14 V

OK

REPLACE REAR LIGHT LENS AND BODY LH

NG

REPLACE REAR LIGHT SOCKET AND WIRE LH

41.

CHECK REAR COMBINATION LIGHT ASSEMBLY LH

(a) Connect the O104 rear combination light assembly LH connector.

(b) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O103-1 (TL) - Body ground

Always

11 to 14 V

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

OK

42.

CHECK REAR COMBINATION LIGHT ASSEMBLY RH

(a) Disconnect the O104 rear combination light assembly LH connector.

(b) Connect the O103 rear combination light assembly RH connector.

(c) Turn the light control switch to the tail position.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O104-1 (TL) - Body ground

Always

11 to 14 V

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH