DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 2 indoor electrical key antenna assembly (rear floor). For the No. 2 indoor electrical key antenna assembly (rear floor) to detect when the electrical key transmitter sub-assembly is inside the vehicle, 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 B27A6 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor) (between terminals CLG6 and CLG, or terminals CG6B and CLGB).
DTC Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B27A6 |
An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor) (CLG6 - CLG, CG6B - CLGB) (1 trip detection logic*). |
|
Any time |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
When electrical key transmitter sub-assembly is in rear seat area:
|
- |
DTC Code |
Data List and Active Test |
---|---|
B27A6 |
Key diagnostic mode can be used to perform troubleshooting |
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 (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor).
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - NO. 2 INDOORELECTRICAL KEY ANTENNA ASSEMBLY) |
(a) Disconnect the C28 and C29 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the N30 No. 2 indoor electrical key antenna assembly (rear floor) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
C28-15 (CLG6) - N30-1 (CLG) |
Always |
Below 1 Ω |
C28-14 (CG6B) - N30-3 (CLGB) |
Always |
Below 1 Ω |
C29-11 (E) - Body ground |
Always |
Below 1 Ω |
C28-15 (CLG6) or N30-1 (CLG) - Body ground |
Always |
10 kΩ or higher |
C28-14 (CG6B) or N30-3 (CLGB) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOORELECTRICAL KEY ANTENNA ASSEMBLY) |
(a) Connect the C28 and C29 certification ECU (smart key ECU assembly) connectors.
*a |
Component with harness connected (Certification ECU (smart key ECU assembly)) |
*b |
Waveform 1 |
*c |
For 30 seconds after closing any door using the door outside handle |
*d |
30 seconds or more have elapsed after closing any door using the door outside handle |
(b) Connect the N30 No. 2 indoor electrical key antenna assembly (rear floor) connector.
(c) Using an oscilloscope, check the waveform.
OK:
Tester Connection |
Switch Condition |
Tool Setting |
Tool Setting |
---|---|---|---|
C28-15 (CLG6) - C29-11 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
C28-14 (CG6B) - C29-11 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
4. |
REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) |
(a) Temporarily replace the No. 2 indoor electrical key antenna assembly (rear
floor) with a new or known good one (See page ).
|
5. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
6. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B27A6 is not output.
OK | ![]() |
END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) WAS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Installation
INSTALLATION
PROCEDURE
1. INSTALL BRAKE PEDAL PAD
(a) Install the brake pedal pad onto the brake pedal.
2. INSTALL BRAKE PEDAL SUPPORT ASSEMBLY
(a) Install the brake pedal support assembly with 4 nuts.
Torque:
14 N·m {145 kgf·cm, 10 ft·lbf}
(b) Connect the stop light switch connector t ...
System Diagram
SYSTEM DIAGRAM
Transmitting ECU (Transmitter)
Receiving ECU
Signal
Communication Method
4 wheel drive control ECU
Skid control ECU (Brake actuator assembly)
High-Low actuator fail
4WD status ...
Some Alarm Functions do not Operate
DESCRIPTION
When the alarm sounds, the following alarm functions operate: the roof console
box assembly and No. 1 room light assembly illuminates, and the headlights, taillights
and hazard lights flash, and the security horn and vehicle horn sound intermittently.
WIRING DIAGRAM
CAUTION / ...