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.
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(b) Turn the power switch on (IG).
(c) Check for DTCs.
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| Result | Proceed to |
|---|---|
| DTCs B242C and B242D are not output | A |
| DTC B242C is output | B |
| DTC B242D is output | C |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| C | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
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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
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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
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On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT RESERVOIR CAP (a) Measure the valve opening pressure. *a O-Ring *b Rubber Packing (1) If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring. (2) Check that the O-ring is not deformed, cracked or sw
