DTC B230D-13: Sub Battery Power Supply Route Circuit Open [08/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

As a backup for when an auxiliary battery power source malfunction occurs during remote parking, a power source (AACT (BUA), CACT (BUA3)) is supplied to the shift control actuator assembly (shift actuator ECU).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	DTC Output from	Priority
B230D-13	Sub Battery Power Supply Route Circuit Open	When remote parking is started and the voltage at the CECU (BUE3) terminal is being monitored, the voltage value is at the threshold or less for 0.9 seconds (1 trip detection logic)	Integrated capacitor (integration control supply) Second power supply remote parking circuit Harness or connector	User informed: Yes	Sub Battery System	A

CHECK FOR DTCs
1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
2. Turn the ignition switch off and wait 6 minutes or more. (A)
3. Turn the ignition switch to ON. (B)
4. Turn the GTS on. (C)
5. Wait for 10 seconds or more. (D)
6. Read the DTCs. (E)
  HINT:
  - If a DTC is output, the system is malfunctioning.
  - If a DTC is not output, perform the following procedure.
7. Enter the following menus: Body Electrical / Sub Battery System / Utility / All Readiness. (F)
8. Enter the DTC to be checked. (G)
9. Check the DTC judgment result. (H)
  HINT:
  - If the judgment result is NORMAL, the system is normal.
  - If the judgment result is ABNORMAL, the system is malfunctioning.
  - If the judgment result is INCOMPLETE, perform steps (A) through (H) again.