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DTC B2390

id0902i7855000

DTC B2390 | Communication system between auto leveling control module (main) and auto leveling control module (sub).
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DETECTION CONDITION | Warning • incorrect servicing of the auto leveling control module could result in electrical shock because the unit is integrated with the discharge headlight control module. Before servicing the auto leveling control module, always refer to "Discharge headlight service warnings." (See DISCHARGE HEADLIGHT SERVICE WARNINGS) Communication between auto leveling control module (main) and auto leveling control module (sub) is not performed.
POSSIBLE CAUSE | • Auto leveling control module (main) malfunction • Open or short circuit in wiring harness between auto leveling control module (main) and auto leveling control module (sub)

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT CONNECTOR CONNECTION • Check fit of auto leveling control modules and headlight connectors on both sides (auto leveling control module (main) and (sub)). • Are installation condition and fit okay? | Yes | Go to next step.
No | After correcting fit, clear DTC and check DTC again. • If DTC is displayed again, go to next step.
2 | INSPECT HEADLIGHT (LH) AND HEADLIGHT (RH) • Disconnect auto leveling control module (main) connector (20-pin) and headlight (LH) connector (12-pin) and auto leveling control module (sub) connector (20-pin) and headlight (RH) connector (12-pin). • Is there continuity between the following connectors? - Auto leveling control module (main) connector (terminal I) and headlight (LH) connector (terminal 1F) - Auto leveling control module (sub) connector (terminal P) and headlight (RH) connector (terminal 1F) | Yes | Go to next step.
No | Possible cause is an open circuit in headlight. Replace headlight (LH) or headlight (RH). (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION)
3 | INSPECT WIRING HARNESS BETWEEN HEADLIGHT (LH) CONNECTOR AND HEADLIGHT (RH) CONNECTOR • Disconnect headlight (LH) connector (12-pin) and headlight (RH) connector (12-pin). • Is there continuity between the following connectors? - Headlight (LH) connector (terminal 1F) and headlight (RH) connector (terminal 1F) | Yes | Repair auto leveling control module (main). (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION)
No | Repair or replace wiring harness between headlight (LH) and headlight (RH).