DTC Code | DTC Name |
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B27A5 | Open in Front Floor Electrical Key Oscillator Circuit |
DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (front floor). For the No. 1 indoor electrical key antenna assembly (front 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 B27A5 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor) (between terminals CLG5 and CLG, or terminals CG5B and CLGB).
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
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B27A5 | Open in Front Floor Electrical Key Oscillator Circuit | An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor) (CLG5 - CLG, CG5B - CLGB) (1 trip detection logic*). |
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DTC Output Confirmation Operation: |
*: Only output while a malfunction is present.
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
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When electrical key transmitter sub-assembly is in front seat area:
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DTC Code | Data List and Active Test |
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B27A5 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
The smart entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
Before replacing the certification ECU (smart key ECU assembly), refer to smart entry and start system (for Entry Function) Precaution.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
CHECK CONNECTOR CONNECTION
Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor).
OK |
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Connectors are properly connected. |
Result | |||
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NG |
CONNECT CONNECTORS PROPERLY |
OK |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))
Disconnect the G22 certification ECU (smart key ECU assembly) connector.
Disconnect the L30*1 or h1*2 No. 1 indoor electrical key antenna assembly (front floor) connector.
*1: w/ Power Back Door System
*2: w/o Power Back Door System
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
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Reconnect the G22 certification ECU (smart key ECU assembly) connector.
Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform 1 |
*c | For 30 seconds after closing any door using the door outside handle | *d | 30 seconds or more have elapsed after closing any door using the door outside handle |
Using an oscilloscope, check the waveform.
OK | ||||||||||||
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Result | |||
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NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
OK |
REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)
Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new one.
Result | ||
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NEXT |
CLEAR DTC
Clear the DTCs.
Result | ||
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NEXT |
CHECK FOR DTC
Check for DTCs.
OK |
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DTC B27A5 is not output. |
Result | |||
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OK |
END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE) |
NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |