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.
Click here .gif)
(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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