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...
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