Lexus NX: Open in IG Circuit (B242E)
DESCRIPTION
This DTC is output when there is a problem in the power supply for the headlight ECU sub-assembly RH.
The headlight ECU sub-assembly LH outputs DTC B242E.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B242E | Open in IG Circuit | IG circuit malfunction in the headlight ECU sub-assembly LH and headlight ECU sub-assembly RH |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
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(b) Turn the power switch on (IG).
(c) Check for DTCs.
Click here
OK:
DTC B242E output does not occur
| OK | .gif) | USE SIMULATION METHOD TO CHECK |
|
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| 2. | CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY AND BODY GROUND) |
| (a) Disconnect the headlight ECU sub-assembly RH connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| A20-4 (IG) - Body ground | Power switch off | Below 1 V |
| A20-4 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A20-12 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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
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SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with the pow
Installation
INSTALLATION PROCEDURE 1. INSTALL REAR TELEVISION CAMERA ASSEMBLY (a) Install the 2 screws and rear television camera assembly. (b) Connect the connector. 2. INSTALL BACK DOOR OUTSIDE GARNISH SUB-ASSEMBLY Click here 3. INSTALL BACK DOOR TRIM BOARD ASSEMBLY Click here 4. INSTALL BACK DOOR SIDE GA
