DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 3 indoor electrical key antenna assembly (inside luggage compartment). For the No. 3 indoor electrical key antenna assembly (inside luggage compartment) 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 B27A7 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
---|---|---|---|---|
B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit | An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*). |
|
|
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
---|---|
When electrical key transmitter sub-assembly is in luggage compartment:
| - |
DTC No. | Data List and Active Test |
---|---|
B27A7 | 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 No. 3 indoor electrical key antenna assembly (inside luggage compartment).
OK:
Connectors are properly connected.
NG | ![]() | CONNECT CONNECTORS PROPERLY |
|
2. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the R20*1, T9*2 No. 3 indoor electrical key antenna assembly (inside luggage compartment) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/o Rear No. 2 Seat: Tester Connection | Condition | Specified Condition |
---|---|---|
R1-11 (CLG7) - R20-1 (ANTE7) | Always | Below 1 Ω |
R1-10 (CG7B) - R20-3 (CLGB) | Always | Below 1 Ω |
J41-18 (E) - Body ground | Always | Below 1 Ω |
R1-11 (CLG7) or R20-1 (ANTE7) - Body ground | Always | 10 kΩ or higher |
R1-10 (CG7B) or R20-3 (CLGB) - Body ground | Always | 10 kΩ or higher |
Tester Connection | Condition | Specified Condition |
---|---|---|
R1-11 (CLG7) - T9-1 (ANTE7) | Always | Below 1 Ω |
R1-10 (CG7B) - T9-3 (CLGB) | Always | Below 1 Ω |
J41-18 (E) - Body ground | Always | Below 1 Ω |
R1-11 (CLG7) or T9-1 (ANTE7) - Body ground | Always | 10 kΩ or higher |
R1-10 (CG7B) or T9-3 (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 NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | *b | Waveform 1 |
*c | For 30 seconds after any door closed | *d | After 30 seconds or more have elapsed since any door closed |
(a) Using an oscilloscope, check the waveform.
OK:
Tester Connection | Condition | Tool Setting | Specified Condition |
---|---|---|---|
R1-11 (CLG7) - J41-18 (E) | Procedure:
| 2 V/DIV., 500 ms/DIV. | Pulse generation (See waveform 1) |
R1-10 (CG7B) - 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 NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) |
(a) Temporarily replace the No. 3 indoor electrical key antenna assembly (inside luggage compartment) with a new or known good one.
w/o Rear No. 2 Seat: Click here
w/ Rear No. 2 Seat: 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 B27A7 is not output.
OK | ![]() | END (NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE) |
NG | ![]() | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Steering Gear: Installation
INSTALLATION PROCEDURE 1. INSTALL TIE ROD ASSEMBLY LH (a) Install the lock nut and tie rod assembly LH to the steering gear assembly until the matchmarks are aligned. HINT: After adjusting the toe-in, tighten the lock nut. *a Matchmark 2. INSTALL TIE ROD ASSEMBLY RH HINT: ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Headup Display System: Lost Communication with EMV (B1321)
DESCRIPTION After the headup display (meter mirror sub-assembly) has started, the headup display (meter mirror sub-assembly) attempts to detect the radio receiver assembly by performing communication via local bus. This DTC is stored when the radio receiver assembly has been detected but communicati ...