Toyota Corolla Cross: 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 |
DTC Detection Condition | Trouble Area |
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*). |
| DTC Output Confirmation Operation:
|
- *: Only output while a malfunction is present and the ignition switch is ON.
|
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
|---|---|
|
Entry lock/unlock operation cannot be performed for back door |
- |
|
DTC No. | Data List and Active Test |
|---|---|
|
B27A813 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- 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.
- 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.
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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 | .gif) | CONNECT CONNECTORS PROPERLY |
|
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| 2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the O200 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the S11 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 |
|---|---|---|
|
O200-4 (CLG8) - S11-2 (ANTE8) |
Always | Below 1 Ω |
|
O200-3 (CG8B) - S11-1 (CLGB) |
Always | Below 1 Ω |
(d) Reconnect the O200 certification ECU (smart key ECU assembly) connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 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 |
|---|---|---|---|
|
O200-4 (CLG8) - I222-29 (E) | Procedure:
| 2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
|
O200-3 (CG8B) - I222-29 (E) | Procedure:
| 2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 2) |
| OK | | REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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