Toyota Yaris: Lighting System / High Beam Headlight Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the high beam headlights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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-
Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.
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-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
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-
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.
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PROCEDURE
| 1. | PERFORM ACTIVE TEST USING GTS |
(a) Enter the following menus: Body Electrical / Main Body / Active Test.
(b) 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 |
|---|---|---|---|
| High Beam Headlight | High beam headlights | OFF or ON | - |
| Tester Display |
|---|
| High Beam Headlight |
OK:
High beam headlights illuminate.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (LH side high beam light does not illuminate.) | B |
| NG (RH side high beam light does not illuminate.) | C |
| A |
.gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C |
| GO TO STEP 5 |
|
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| 2. | CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - LIGHT CONTROL LED ECU LH) |
| *a | Component without harness connected (to Wire Harness) | *b | Component without harness connected (to Light Control LED ECU) |
| *c | Component without harness connected (to Headlight Unit Assembly LH) | - | - |
(a) Remove the headlight assembly LH.
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(b) Remove the wire harness.
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-[2] - B-[15] | Always | Below 1 Ω |
| A-[4] - B-[4] | Always | Below 1 Ω |
| A4-2 (LO) - B-[19] | Always | Below 1 Ω |
| A4-5 (E) - B-[8] | Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK LIGHT CONTROL LED ECU LH |
(a) Interchange the light control LED ECU LH with RH and connect the connectors to them.
Click here
|
| 4. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the low beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK |
| REPLACE LIGHT CONTROL LED ECU LH |
| NG |
| REPLACE HEADLIGHT UNIT ASSEMBLY LH |
| 5. | CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - LIGHT CONTROL ECU) |
| *a | Component without harness connected (to Wire Harness) | *b | Component without harness connected (to Light Control ECU) |
| *c | Component without harness connected (to Headlight Unit Assembly RH) | - | - |
(a) Remove the headlight assembly RH.
Click here
(b) Remove the wire harness.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-[2] - B-[15] | Always | Below 1 Ω |
| A-[4] - B-[4] | Always | Below 1 Ω |
| A5-2 (LO) - B-[19] | Always | Below 1 Ω |
| A5-5 (E) - B-[8] | Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK LIGHT CONTROL LED ECU RH |
(a) Interchange the light control LED ECU RH with LH and connect the connectors to them.
Click here
|
| 7. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the low beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK |
| REPLACE LIGHT CONTROL LED ECU RH |
| NG |
| REPLACE HEADLIGHT UNIT ASSEMBLY RH |
Taillight Relay Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the, taillight and license plate light. WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE:
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: ID-BOX Missing Message (B278987)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more. DTC No. Detection Item DTC Detection Condition Trouble Area B278987 ID-BOX Missing Message No communication between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components
COMPONENTS ILLUSTRATION *1 FRONT BUMPER ASSEMBLY *2 PIN HOLD CLIP ILLUSTRATION *A w/ Pre-collision System - - *1 NO. 3 ENGINE ROOM WIRE *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 FOG LIGHT COVER LH *2 FOG LIGHT COVER RH *3 FOG LIGHT ASSEMBLY LH *4 FOG LIGHT ASSEMBLY RH *5 FRONT BUMPER HOLE COVER *6 HOOD TO FRONT END PANEL SEAL *7 LOWER RADIATOR GRILLE SUB-ASSEMBLY *8 RADIATOR GRILLE SIDE MOULDING LH *9 RADIATOR GRILLE SIDE MOULDING RH *10 RADIATOR GRILLE EMBLEM ASSEMBLY *11 FRONT BUMPER EXTENSION MOUNTING BRACKET - - ILLUSTRATION *1 FRONT BUMPER ENERGY ABSORBER *2 FRONT BUMPER SIDE RETAINER RH *3 RADIATOR UPPER AIR GUIDE PLATE *4 HEADLIGHT ASSEMBLY RH *5 HEADLIGHT ASSEMBLY LH *6 FRONT BUMPER SIDE RETAINER LH *7 FRONT BUMPER REINFORCEMENT *8 THERMISTOR ASSEMBLY *9 COOL AIR INTAKE DUCT - - N*m (kgf*cm, ft...
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Keys
To use the auxiliary key, press the knob and pull out the auxiliary key from the smart key.
