Toyota Yaris: Smart Key System (for Entry Function) / Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open (B27A813)
DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the electrical key antenna (outside luggage compartment). For the electrical key antenna (outside luggage compartment) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, the received request signal is transmitted within approximately 1 m (3.28 ft.) of the back door. DTC B27A813 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (between terminals CLG8 and ANTE8, or terminals CG8B and CLGB).
DTC No. | Detection Item | INF Code | DTC Detection Condition | Note |
B27A813 | Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open | An open is detected in the circuit between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (CLG8 - ANTE8, CG8B - CLGB) (1 trip detection logic*1). | -
Certification ECU (smart key ECU assembly)
-
Electrical key antenna (outside luggage compartment)
-
Harness or connector
| |
-
*1: Only output while a malfunction is present and the ignition switch is ON.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
Entry lock/unlock operation cannot be performed for back door | - |
Related Data List and Active Test
DTC No. | Data List and Active Test |
B27A813 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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When using the GTS with the ignition 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 the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. 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.
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The smart key system (for Entry Function) uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
Click here
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Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.
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After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
1. | CHECK CONNECTOR CONNECTION |
(a) Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment).
OK:
Connectors are properly connected.
NG |
| CONNECT CONNECTORS PROPERLY |
OK |
| |
2. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the O47 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the O45 electrical key antenna (outside luggage compartment) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
O47-4 (CLG8) - O45-2 (ANTE8) | Always | Below 1 Ω |
O47-3 (CG8B) - O45-1 (CLGB) | Always | Below 1 Ω |
(d) Reconnect the O47 certification ECU (smart key ECU assembly) connector.
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
3. | CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | *b | Waveform 1 |
*c | Waveform 2 | - | - |
(a) Using an oscilloscope, check the waveform.
OK:
Tester Connection | Condition | Tool Setting | Specified Condition |
O47-4 (CLG8) - H46-29 (E) | Procedure: -
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Back door opener switch assembly off → on
| 5 V/DIV., 50 ms./DIV. | Pulse generation (See waveform 1) |
O47-3 (CG8B) - H46-29 (E) | Procedure: -
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Back door opener switch assembly off → on
| 5 V/DIV., 50 ms./DIV. | Pulse generation (See waveform 2) |
OK |
| REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) |
NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
DESCRIPTION The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly RH (electrical key antenna) at intervals of 0...
DESCRIPTION If the entry lock and wireless door lock operations cannot be performed, the smart door control receiver assembly may be malfunctioning, or there may be wave interference or problems in the communication which is used for the entry and wireless function between the smart door control receiver assembly and certification ECU (smart key ECU assembly)...
Other information:
This chart indicates the applicable SRS equipment that will deploy
depending on the type of collision.
(The illustrations are the representative cases of collisions.)
X:The SRS air bag equipment is designed to deploy in a
collision.
* 1: The front passenger front and side air bags and the seat
belt pretensioner
are designed to deploy when the front passenger occupant classification
sensor detects a passenger sitting on the front passenger’s seat...
TERMINALS OF ECU TERMINALS OF ECU
*a Component without harness connected (Skid Control ECU [Brake Actuator Assembly]) - - Terminal No. (Symbol) Terminal Description 1 (GND2) Pump motor ground 2 - (Not used) 3 - (Not used) 4 - (Not used) 5 (STP2) Stop light switch assembly input 6 - (Not used) 7 - (Not used) 8 - (Not used) 9 - (Not used) 10 (CANL) CAN communication line L 11 - (Not used) 12 (IGR) ECU power supply input 13 (BM) Motor relay power supply 14 (SP1) Speed signal output for speedometer 15 (RR-) Rear wheel speed RH (-) signal input 16 (RR+) Rear wheel speed RH (+) power supply output 17 (FL-) Front wheel speed LH (-) signal input 18 (FL+) Front wheel speed LH (+) power supply output 19 - (Not used) 20 - (Not used) 21 - (Not used) 22 (CANH) CAN communication line H 23 - (Not used) 24 - (Not used) 25 (GND1) Skid control ECU (brake actuator assembly) ground 26 (STPO) Stop light switch assembly output 27 - (Not used) 28 (RL-) Rear wheel speed LH (-) signal input 29 (RL+) Rear wheel speed LH (+) power supply output 30 (FR-) Front wheel speed RH (-) signal input 31 (FR+) Front wheel speed RH (+) power supply output 32 - (Not used) 33 (CSW) VSC OFF switch (combination switch assembly) input 34 - (Not used) 35 (STP) Stop light switch assembly input 36 (CA2H) CAN communication line H 37 (CA2L) CAN communication line L 38 (+BS) Solenoid relay power supply TERMINAL INSPECTION (a) Disconnect the A108 connector and measure the voltage or resistance on the wire harness side...