Toyota Yaris: Lighting System / Headlight LH Circuit (B243900,B243A00)
DESCRIPTION
The light control LED ECU supplies internally boosted voltage to the light control LED ECU LH so that the current supplied to the LED is always maintained at a constant value.
These DTCs are also output when the main body ECU (multiplex network body ECU) detects malfunctions while monitoring the applied voltage.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B243900 | Headlight LH Circuit |
Malfunction status:
|
|
| B243A00 | Headlight RH Circuit |
Malfunction status:
|
|
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.
Click here
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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.
Click here
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
.gif)
| 2. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| B243900 and B243A00 are not output | A |
| B243900 is output | B |
| B243A00 is output | C |
| A |
.gif) | USE SIMULATION METHOD TO CHECK |
| C |
| GO TO STEP 6 |
|
| 3. | CHECK HEADLIGHT UNIT ASSEMBLY LH |
(a) Interchange the headlight unit assembly LH with RH and connect the connectors to them.
Click here
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
| 4. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B243900 is output | A |
| DTC B243A00 is output | B |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY LH |
|
| 5. | CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - LIGHT CONTROL LED ECU LH) |
| (a) Remove the headlight unit assembly LH. 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 - [1] - B - [16] | Always | Below 1 Ω |
| A - [3] - B - [5] | Always | Below 1 Ω |
| OK |
| REPLACE LIGHT CONTROL LED ECU LH |
| NG |
| REPLACE HARNESS AND CONNECTOR |
| 6. | CHECK HEADLIGHT UNIT ASSEMBLY RH |
(a) Interchange the headlight unit assembly RH with LH and connect the connectors to them.
Click here
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
|
| 7. | CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Wait 10 seconds or more.
(c) Turn the GTS on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B243A00 is output | A |
| DTC B243900 is output | B |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY RH |
|
| 8. | CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - LIGHT CONTROL LED ECU RH) |
| (a) Remove the headlight unit 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 - [1] - B - [16] | Always | Below 1 Ω |
| A - [3] - B - [5] | Always | Below 1 Ω |
| OK |
| REPLACE LIGHT CONTROL LED ECU RH |
| NG |
| REPLACE HARNESS AND CONNECTOR |
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