Lexus NX: Right Headlight ECU Malfunction (B242C,B242D)

DESCRIPTION

These DTCs are output when an internal malfunction in the headlight ECU sub-assembly occurs.

The headlight ECU sub-assembly LH outputs DTC B242C and B242D.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B242C

Right Headlight ECU Malfunction

Headlight ECU sub-assembly RH malfunction

Headlight ECU sub-assembly RH

B242D

Left Headlight ECU Malfunction

Headlight ECU sub-assembly LH malfunction

Headlight ECU sub-assembly LH

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.

Click here

Body Electrical > AFS > Clear DTCs

(b) Turn the power switch on (IG).

(c) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

Result

Proceed to

DTCs B242C and B242D are not output

A

DTC B242C is output

B

DTC B242D is output

C

A

USE SIMULATION METHOD TO CHECK

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

C

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

READ NEXT:

 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

 Headlamp LH Circuit (B2439,B243A)

DESCRIPTION This DTC is output when the headlight ECU sub-assembly receives an abnormal signal from the headlight unit. The headlight ECU sub-assembly LH outputs DTC B2439 and B243A DTC No. Detec

 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

SEE MORE:

 On-vehicle Inspection

ON-VEHICLE INSPECTION PROCEDURE 1. CHECK AUXILIARY BATTERY (a) Check that the auxiliary battery cables are connected to the correct terminals. HINT: If they are not, connect them properly. (b) Check the auxiliary battery for damage and deformation. HINT: If severe damage, deformation or leakage is f

 Installation

INSTALLATION CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure described below is for the LH side. PROCEDURE 1. INSTALL LICENSE PLATE LIGHT ASSEMBLY LH (a) Attach the 2 claws to install the license plate light assembly LH. (b) Connect the connector.

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