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 B27A8 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 |
---|---|---|---|---|
B27A8 | Open in Outside Luggage Compartment Electrical Key Antenna Circuit | 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*). |
|
|
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 |
---|---|
B27A8 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
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 |
|
2. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the W1 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 |
---|---|---|
R1-13 (CLG8) - W1-2 (ANTE8) | Always | Below 1 Ω |
R1-12 (CG8B) - W1-1 (CLGB) | Always | Below 1 Ω |
J41-18 (E) - Body ground | Always | Below 1 Ω |
R1-13 (CLG8) or W1-2 (ANTE8) - Body ground | Always | 10 kΩ or higher |
R1-12 (CG8B) or W1-1 (CLGB) - Body ground | Always | 10 kΩ or higher |
(d) Reconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.
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 |
(a) Using an oscilloscope, check the waveform.
OK:
Tester Connection | Condition | Tool Setting | Specified Condition |
---|---|---|---|
R1-13 (CLG8) - J41-18 (E) | Procedure:
| 2 V/DIV., 500 ms/DIV. | Pulse generation (See waveform 1) |
R1-12 (CG8B) - J41-18 (E) | Procedure:
| 2 V/DIV., 500 ms/DIV. | Pulse generation (See waveform 1) |
NG | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
4. | REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) |
(a) Temporarily replace the electrical key antenna (outside luggage compartment) with a new or known good one.
Click here
|
5. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs
|
6. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Access > Trouble CodesOK:
DTC B27A8 is not output.
OK | END (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE) |
NG | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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