DESCRIPTION
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 inside the vehicle, 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 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. 2 indoor electrical key antenna assembly (rear floor) (between terminals CLG6 and ANTE6, or terminals CG6B and CLGB).
DTC Code | DTC Detection Condition | Trouble Area | DTC Output Confirmation Operation |
---|---|---|---|
B27A6 | An open circuit 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*). |
|
Any time |
*: Only output while a malfunction is present.
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
---|---|
When electrical key transmitter sub-assembly is in rear seat area:
|
- |
DTC Code | Data List and Active Test |
---|---|
B27A6 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the Techstream with the power switch off to troubleshoot:
Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) precaution Click here.
After repair, confirm that no DTCs are output by performing the "DTC Output Confirmation Operation".
The No. 2 indoor electrical key antenna assembly (rear floor) has an antenna coil between ANTE6 and CLGB terminals.
PROCEDURE
CHECK CONNECTOR CONNECTION
Turn the power switch off.
Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor).
OK |
---|
Connectors are properly connected. |
NG |
CONNECT CONNECTORS PROPERLY |
OK |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY)
Disconnect the O2 and I86 certification ECU (smart key ECU assembly) connectors.
Disconnect the N10 No. 2 indoor electrical key antenna assembly (rear floor) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY)
Connect the O2 and I86 certification ECU (smart key ECU assembly) connectors.
*1 | Waveform | - | - |
*a | Component with harness connected (Certification ECU (smart key ECU assembly)) |
*b | Within approximately 30 seconds from when the door is closed |
*c | After approximately 30 seconds from when the door is closed | - | - |
Connect the N10 No. 2 indoor electrical key antenna assembly (rear floor) connector.
Using an oscilloscope, check the waveform.
OK | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here |
OK |
REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR)
Temporarily replace the No. 2 indoor electrical key antenna assembly (rear floor) with a new or known good one Click here.
NEXT |
CLEAR DTC
Clear the DTCs Click here.
NEXT |
CHECK FOR DTC
Check for DTCs Click here.
OK |
---|
DTC B27A6 is not output. |
NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here |
OK |
END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) WAS DEFECTIVE)