Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Diagnostic Trouble Code Chart

B2781

Open / Short in Steering Lock ECU

One of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)):

DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).

B2782

Power Source Control ECU Malfunction

Either of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)):

HINT:

If the power supply signal from the LIN communication line does not match the power supply signal from the direct line, the system is determined to be malfunctioning.

DTC Output Confirmation Operation: Perform a steering lock/unlock operation. (The steering locks when a door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC) or on (IG) while carrying the key.)

B2788

IG2 Signal Malfunction

Mismatch between the steering lock ECU (steering lock actuator or upper bracket assembly) IG2 input from the LIN communication system and from the direct line. (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).))

DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).