Lighting System (Diagnostics & Circuit Tests): Overview Toyota Corolla X рестайлинг

OPERATION CHECK

1. DAYTIME RUNNING LIGHT OPERATION CHECK Turn the light control switch off. Start the engine. Release the parking brake. Check that the daytime running lights (dimmed high beam headlights) come on.

DESCRIPTION

1. The daytime running light relay receives the light control switch HEAD signal and the ambient light level signal from the automatic light control sensor to control the headlight relay. HINT: If only a low beam headlight bulb on one side does not illuminate, inspect the bulb, fuse, or wire harness related to the bulb.

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1. INSPECT FUSE (H-LP MAIN) Remove the H-LP MAIN fuse from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H-LP MAIN fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. INSPECT ENGINE ROOM RELAY BLOCK Install the H-LP MAIN fuse to the engine room relay block. Remove the H-LP LH LO fuse and H-LP RH LO fuse from the engine room relay block. Measure the voltage between the loading slot of each fuse and body ground. Standard Voltage Tester Connection Switch Condition Specified Condition H-LP LH LO fuse terminal - Body ground Light control switch OFF --> HEAD Below 1 V --> 11 to 14 V H-LP RH LO fuse terminal - Body ground Light control switch OFF --> HEAD Below 1 V --> 11 to 14 V NG --> See step 3 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)
3. INSPECT HEADLIGHT RELAY (H-LP) Remove the headlight relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Voltage is not applied between terminals 1 and 2 10 kohms or higher 3 - 5 Voltage is applied between terminals 1 and 2 Below 1 ohms NG --> REPLACE HEADLIGHT RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY) Measure the voltage on the relay block side according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Headlight relay terminal 5 - Body ground Always 11 to 14 V Headlight relay terminal 1 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - FUSE) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Headlight relay terminal 3 - H-LP LH LO fuse terminal Always Below 1 ohms Headlight relay terminal 3 - H-LP RH LO fuse terminal Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - DAYTIME RUNNING LIGHT RELAY) Disconnect the E91 daytime running light relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Headlight relay terminal 2 - E91-4 (H-LP) Always Below 1 ohms E91-4 (H-LP) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
7. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)

1. When both of the following conditions are met, the high beam headlights will come on. Low beam headlights are turned on by the automatic light control or manual light control. Dimmer switch is in HIGH position.
2. The daytime running light relay dims the high beam headlights when operating them as daytime running lights.
3. When the dimmer switch is turned to the HIGH FLASH position, the high beam headlights will come on. HINT: If only a high beam headlight on one side does not illuminate, inspect the fuse, bulb, or wire harness that is related to the bulb. Before performing troubleshooting of the high beam headlight control, check that the low beam headlight operates normally.

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1. INSPECT HEADLIGHT DIMMER RELAY (DIM) Remove the headlight dimmer relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Voltage is not applied between terminals 1 and 2 10 kohms or higher 3 - 5 Voltage is applied between terminals 1 and 2 Below 1 ohms NG --> REPLACE HEADLIGHT DIMMER RELAY OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT DIMMER RELAY) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Headlight dimmer relay terminal 2 - Body ground Always 11 to 14 V Headlight dimmer relay terminal 3 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - DAYTIME RUNNING LIGHT RELAY) Disconnect the E91 daytime running light relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Headlight dimmer relay terminal 1 - E91-13 (DIM) Always Below 1 ohms E91-13 (DIM) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT ASSEMBLY) Disconnect the A38 headlight assembly LH and A37 headlight assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Headlight dimmer relay terminal 5 - A38-1 Always Below 1 ohms Headlight dimmer relay terminal 5 - Body ground Always 10 kohms or higher Headlight dimmer relay terminal 5 - A37-1 Always Below 1 ohms Headlight dimmer relay terminal 5 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - DAYTIME RUNNING LIGHT RELAY) Disconnect the E91 daytime running light relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A38-2 - E91-10 (DRL) Always Below 1 ohms A38-2 - Body ground Always 10 kohms or higher A37-2 - E91-10 (DRL) Always Below 1 ohms A37-2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
6. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)

1. When both of the following conditions are met, the front fog lights come on: The low beam headlights are turned on using either automatic light control or manual operation, and the high beam headlights are off. Front fog light switch is on.

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1. INSPECT FUSE (FR FOG) Remove the FR FOG fuse from the instrument panel junction block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition FR FOG fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. INSPECT FRONT FOG LIGHT RELAY Remove the front fog light relay. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Voltage is not applied between terminals 1 and 2 10 kohms or higher 3 - 5 Voltage is applied between terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT FOG LIGHT RELAY OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (BATTERY - FRONT FOG LIGHT RELAY) for TMC Made Install the FR FOG fuse. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2 - Body ground Always 11 to 14 V 5 - Body ground Always 11 to 14 V except TMC Made Install the FR FOG fuse. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2 - Body ground Always 11 to 14 V 5 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY Remove the headlight dimmer switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 (LFG) - 4 (BFG) Fog light switch off 10 kohms or higher 3 (LFG) - 4 (BFG) Fog light switch on Below 1 ohms Reinstall the headlight dimmer switch assembly. NG --> See step 9 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - HEADLIGHT DIMMER SWITCH ASSEMBLY) for TMC Made Disconnect the E8 headlight dimmer switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Front fog light relay terminal 1 - E8-4 (BFG) Always Below 1 ohms Front fog light relay terminal 1 - Body ground Always 10 kohms or higher except TMC Made Disconnect the E8 headlight dimmer switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Front fog light relay terminal 1 - E8-4 (BFG) Always Below 1 ohms Front fog light relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - DAYTIME RUNNING LIGHT RELAY) Disconnect the E91 daytime running light relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E8-3 (LFG) - E91-2 (FOG) Always Below 1 ohms E8-3 (LFG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - FOG LIGHT ASSEMBLY) for TMC Made Disconnect the A25 fog light assembly LH connector and the A22 fog light assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Front fog light relay terminal 3 - A25-2 Always Below 1 ohms Front fog light relay terminal 3 - Body ground Always 10 kohms or higher Front fog light relay terminal 3 - A22-2 Always Below 1 ohms Front fog light relay terminal 3 - Body ground Always 10 kohms or higher except TMC Made Disconnect the A25 fog light assembly LH connector and the A22 fog light assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Front fog light relay terminal 3 - A25-2 Always Below 1 ohms Front fog light relay terminal 3 - Body ground Always 10 kohms or higher Front fog light relay terminal 3 - A22-2 Always Below 1 ohms Front fog light relay terminal 3 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (FOG LIGHT ASSEMBLY - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A25-1 - Body ground Always Below 1 ohms A22-1 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 10
9. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to «COMPONENTS»(ref-426051-S34574760422011101200000)
10. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)

1. The daytime running light relay receives the following signals: Light control switch TAIL or HEAD signal Dimmer switch HIGH or HIGH FLASH (PASS) signal

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The daytime running light relay receives an engine condition signal via the generator.

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1. CHECK DAYTIME RUNNING LIGHT RELAY Measure the voltage according to the value(s) in the table below. Standard Voltage Tester connection Condition Specified condition E91-6 (CHG-) - Body ground Engine running 11 to 14 V NG --> See step 2 OK --> See step 3
2. INSPECT GENERATOR ASSEMBLY Inspect generator assembly. Refer to «INSPECTION»(/toyota/corolla/x-2010-2013/remont/body-electrical/#charging-system-2zr-fe-service-information) for 2ZR-FE. Refer to INSPECTION for 2AZ-FE). Result Result Proceed to OK A NG (for 2ZR-FE) B NG (for 2AZ-FE) C C --> See step 5 B --> See step 4 A --> REPAIR OR REPLACE HARNESS OR CONNECTOR (GENERATOR ASSEMBLY - DAYTIME RUNNING LIGHT RELAY)
3. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)
4. REPLACE GENERATOR ASSEMBLY. Refer to «INSPECTION»(/toyota/corolla/x-2010-2013/remont/body-electrical/#charging-system-2zr-fe-service-information)
5. REPLACE GENERATOR ASSEMBLY. Refer to INSPECTION

The daytime running light relay receives the parking brake switch signal.

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1. CHECK HARNESS AND CONNECTOR (DAYTIME RUNNING LIGHT RELAY - BODY GROUND) Disconnect the E91 daytime running light relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester connection Condition Specified condition E91-9 (PKB) - Body ground Parking brake is released 10 kohms or higher E91-9 (PKB) - Body ground Parking brake is applied Below 1 ohms NG --> See step 2 OK --> See step 3
2. INSPECT PARKING BRAKE SWITCH ASSEMBLY Remove the parking brake switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester connection Condition Specified resistance 1 - Switch body OFF (When shaft is pressed) 10 kohms or higher 1 - Switch body ON (When shaft is not pressed) Below 1 ohms NG --> See step 4 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (PARKING BRAKE SWITCH CIRCUIT)
3. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)
4. REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to «COMPONENTS»(ref-426104-S40889079132011101200000)

1. The daytime running light relay receives the light control switch TAIL signal to control the taillight relay.

HINT

1. If only one taillight does not illuminate, check the bulb or wire harness related to the bulb.
2. The taillight relay is installed in the instrument panel junction block, so unlike conventional relays, it can not be removed for inspection.

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1. INSPECT FUSE (TAIL) Remove the TAIL fuse from the instrument panel junction block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition TAIL fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK Measure the voltage between the loading slot of the TAIL fuse and body ground. Standard Voltage Tester Connection Condition Specified Condition TAIL fuse terminal - Body ground Light control switch OFF --> TAIL Below 1 V --> 11 to 14 V NG --> See step 3 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - EACH BULB)
3. CHECK HARNESS AND CONNECTOR (BATTERY - DAYTIME RUNNING LIGHT CONTROL RELAY) Disconnect the E91 daytime running light relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E91-14 (TAIL) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT DAYTIME RUNNING LIGHT RELAY Reconnect the E91 daytime running light relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E91-14 (TAIL) - Body ground Light control switch OFF --> TAIL 11 to 14 V --> Below 1 V NG --> See step 5 OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
5. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-426115-S32738808192011101200000)

The daytime running light relay receives headlight dimmer switch assembly information to control high beam headlight indicator.

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This circuit detects the state of the ignition switch, and sends it to the daytime running light relay.

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See also:
• INSPECTION