Lexus NX: Left Low Beam Fan Malfunction (B243D,B243E)
DESCRIPTION
This DTC is output when the low beam fan is malfunctioning and the low beam illumination is dark.
The headlight ECU sub-assembly LH outputs DTC B243D and B243E
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B243D | Left Low Beam Fan Malfunction | The headlight assembly LH low beam fan is malfunctioning and the low beam illumination is dark. |
|
| B243E | Right Low Beam Fan Malfunction | The headlight assembly RH low beam fan is malfunctioning and the low beam illumination is dark. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After the headlight ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
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(b) Turn the power switch on (IG).
(c) Turn on the headlights using the headlight dimmer switch.
(d) Check for DTCs.
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| Result | Proceed to |
|---|---|
| DTCs B243D or B243E are not output | A |
| DTC B243D is output | B |
| DTC B243E is output | C |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| C | | GO TO STEP 3 |
|
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| 2. | CHECK HEADLIGHT UNIT ASSEMBLY LH |
(a) Interchange the headlight unit assembly LH with RH and connect the connectors to them.
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(b) Clear the DTCs.
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(c) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC B243D is output | A |
| DTC B243E is output | B |
| A | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
| B | | REPLACE HEADLIGHT UNIT ASSEMBLY LH |
| 3. | 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.
Click here
(c) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC B243E is output | A |
| DTC B243D is output | B |
| A | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| B | | REPLACE HEADLIGHT UNIT ASSEMBLY LH |
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Vehicle Specifications have not been Stored (B2451)
DESCRIPTION This DTC is output if the vehicle variation information is not written to the headlight ECU sub-assembly LH. The headlight ECU sub-assembly LH outputs DTC B2451. DTC No. Detection Ite
Right Headlight ECU Variation Error (B2455)
DESCRIPTION This DTC is output when a headlight ECU sub-assembly RH that is incompatible with the vehicle is installed. The headlight ECU sub-assembly LH outputs DTC B2455. DTC No. Detection Item
Left Headlight ECU Variation Error (B2456)
DESCRIPTION This DTC is output when a headlight ECU sub-assembly LH that is incompatible with the vehicle is installed. The headlight ECU sub-assembly LH outputs DTC B2456. DTC No. Detection Item
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Installation
INSTALLATION PROCEDURE 1. INSTALL REAR SIDE SPOILER SUB-ASSEMBLY LH (a) Attach the 2 clips and guide to install the rear side spoiler sub-assembly LH. 2. INSTALL REAR SIDE SPOILER SUB-ASSEMBLY RH HINT: Use the same procedure described for the LH side. 3. INSTALL REAR SPOILER ASSEMBLY (a) Attach the
System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU Receiving ECU Signal Communication Method Main body ECU (multiplex network body ECU) Multiplex network door ECU
Combination switch assembly signal
Back door opener switch assembly signal
Power back door ON/OFF signal
