DESCRIPTION
The certification ECU generates a request signal and transmits the signal to the indoor No. 2 electrical key antenna (rear floor). The indoor No. 2 electrical key antenna (rear floor) detects that the electrical key is inside the vehicle and transmits the request signal received from the certification ECU. DTC B27A6 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and indoor No. 2 electrical key antenna (rear floor) (CLG6 - CLG4, CG6B - CLGB).
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B27A6 |
An open circuit is detected in the circuit between the certification ECU and indoor No. 2 electrical key antenna (rear floor) (CLG6 - CLG4, CG6B - CLGB). |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK CONNECTOR CONNECTION |
(a) Turn the engine switch off.
(b) Check that the connectors are properly connected to the certification ECU and indoor No. 2 electrical key antenna (rear floor).
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
2. |
CHECK HARNESS AND CONNECTOR (INDOOR NO. 2 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU) |
(a) Disconnect the O9 antenna connector.
(b) Disconnect the F79 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O9-1 (CLG4) - F79-24 (CLG6) |
Always |
Below 1 Ω |
O9-3 (CLGB) - F79-25 (CG6B) |
Always |
Below 1 Ω |
F79-24 (CLG6) - Body ground |
Always |
10 kΩ or higher |
F79-25 (CG6B) - Body ground |
Always |
10 kΩ or higher |
F79-15 (E) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK CERTIFICATION ECU |
(a) Measure the voltage according to the value(s) in the table below.
*a |
Component with harness connected (Certification ECU) |
- |
- |
OK:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F79-24 (CLG6) - F79-15 (E) |
Engine switch off, all doors closed, key not in cabin and lock sensor off → on |
No pulse generation → Pulse generation |
F79-25 (CG6B) - F79-15 (E) |
Engine switch off, all doors closed, key not in cabin and lock sensor off → on |
No pulse generation → Pulse generation |
NG | ![]() |
REPLACE CERTIFICATION ECU |
|
4. |
REPLACE INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) |
(a) Temporarily replace the indoor No. 2 electrical key antenna (rear floor)
with a new or normally functioning one (See page ).
|
5. |
CHECK FOR DTC |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
OK:
DTC B27A6 is not output.
OK | ![]() |
END (INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU |
System Diagram
SYSTEM DIAGRAM
Communication Table
Sender
Receiver
Signal
Line
ECM
Skid control ECU
Engine speed signal
Accelerator pedal position signal
Intak ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" ...