| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000028JQ6 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: Front Fog Light Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ] | ||
|
Front Fog Light Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the front fog lights.
WIRING DIAGRAM
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](/t3Portal/stylegraphics/info.gif)
for Gasoline Model:Click here
-
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
PROCEDURE
|
1. |
CHECK OPERATION (TAILLIGHTS) |
(a) Check the operation of the taillights.
OK:
Taillights operate normally.
| NG |
|
GO TO PROBLEM SYMPTOMS TABLE
|
|
|
2. |
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 |
|---|---|---|---|
|
Front Fog Light Relay |
Front fog lights |
OFF or ON |
Light control switch in tail position |
Body Electrical > Main Body > Active Test
|
Tester Display |
|---|
|
Front Fog Light Relay |
OK:
Front fog light relay operates. (Front fog lights come on.)
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE - FR FOG RELAY) |
(a) Remove the FR FOG relay.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (FR FOG relay) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (FR FOG RELAY INPUT VOLTAGE) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (FR FOG relay) - Body ground |
Light control switch in tail or head position |
11 to 14 V |
| NG |
|
|
|
5. |
INSPECT FR FOG RELAY |
(a) Inspect the FR FOG relay.
Click here
| NG |
|
REPLACE FR FOG RELAY |
|
|
6. |
CHECK HARNESS AND CONNECTOR (FR FOG RELAY - FOG LIGHT ASSEMBLY) |
(a) Disconnect the A43 fog light assembly LH connector.
(b) Disconnect the A42 fog light assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (FR FOG relay) - A43-1 (B) |
Always |
Below 1 Ω |
|
3 (FR FOG relay) - A42-1 (B) |
Always |
Below 1 Ω |
|
3 (FR FOG relay) or A43-1 (B) - Body ground |
Always |
10 kΩ or higher |
|
3 (FR FOG relay) or A42-1 (B) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK HARNESS AND CONNECTOR (FR FOG RELAY - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8H power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (FR FOG relay) - 8H-7 |
Always |
Below 1 Ω |
|
1 (FR FOG relay) or 8H-7 - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (FR FOG RELAY - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8H power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (FR FOG relay) - 8H-7 |
Always |
Below 1 Ω |
|
1 (FR FOG relay) or 8H-7 - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|