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Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Smart Access System (For Start) - Diagnostic Codes & Symptom Tests (1 Of 2)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HEV Model) >> DTC B27A6-13: Rear Floor Electrical Key Oscillator Circuit Open [11/2021 - ] >> Description

DTC B27A6-13: Rear Floor Electrical Key Oscillator Circuit Open [11/2021 - ]: Description

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The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 2 indoor electrical key antenna assembly (rear floor). For the No. 2 indoor electrical key antenna assembly (rear floor) to detect when the electrical key transmitter sub-assembly is in the cabin, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27A6-13 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor) (between terminals CLG6 and ANTE6, or terminals CG6B and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27A6-13 Rear Floor Electrical Key Oscillator Circuit Open An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor) (CLG6 - ANTE6, CG6B - CLGB) (1 trip detection logic*).
  • Certification ECU (smart key ECU assembly)
  • No. 2 indoor electrical key antenna assembly (rear floor)
  • Wire harness or connector
 DTC Output Confirmation Operation: 
  1. Any time
  1. *: Only output while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
When electrical key transmitter sub-assembly is in rear seat area:
  • Power source mode does not change when power switch pressed
  • Electrical key transmitter sub-assembly locked inside vehicle
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RELATED DATA LIST AND ACTIVE TEST

DTC No. Data List and Active Test
B27A6-13 Key diagnostic mode can be used to perform troubleshooting
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