DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (front floor). For the No. 1 indoor electrical key antenna assembly (front 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 B27A5 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. 1 indoor electrical key antenna assembly (front floor) (between terminals CLG5 and CLG, or terminals CG5B and CLGB).
DTC Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B27A5 |
An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor) (CLG5 - CLG, CG5B - 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 front seat area:
|
- |
DTC Code |
Data List and Active Test |
---|---|
B27A5 |
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. 1 indoor electrical key antenna assembly (front floor).
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOORELECTRICAL KEY ANTENNA ASSEMBLY) |
(a) Disconnect the C29 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the N29 No. 1 indoor electrical key antenna assembly (front floor) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
C29-21 (CLG5) - N29-1 (CLG) |
Always |
Below 1 Ω |
C29-20 (CG5B) - N29-3 (CLGB) |
Always |
Below 1 Ω |
C29-11 (E) - Body ground |
Always |
Below 1 Ω |
C29-21 (CLG5) or N29-1 (CLG) - Body ground |
Always |
10 kΩ or higher |
C29-20 (CG5B) or N29-3 (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. 1 INDOORELECTRICAL KEY ANTENNA ASSEMBLY) |
(a) Connect the 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 N29 No. 1 indoor electrical key antenna assembly (front floor) connector.
(c) Using an oscilloscope, check the waveform.
OK:
Tester Connection |
Switch Condition |
Tool Setting |
Specified Condition |
---|---|---|---|
C29-21 (CLG5) - C29-11 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
C29-20 (CG5B) - 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. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) |
(a) Temporarily replace the No. 1 indoor electrical key antenna assembly (front
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 B27A5 is not output.
OK | ![]() |
END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Removal
REMOVAL
PROCEDURE
1. REMOVE REAR BUMPER ASSEMBLY (w/ Towing Package)
(See page )
2. REMOVE REAR BUMPER ASSEMBLY (w/o Towing Package)
(See page )
3. REMOVE CONNECTOR COVER (w/ Towing Package)
(See page )
4. REMOVE REAR BUMPER HOLE COVER (w/o Towing Package)
(See page )
5. REMOVE REAR ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL DIFFERENTIAL SIDE GEAR SHAFT OIL SEAL
(a) Using SST and a hammer, install a new oil seal.
SST: 09554-30011
(b) Coat the oil seal lip with MP grease.
2. INSTALL FRONT DRIVE SHAFT ASSEMBLY LH
Click here
3. INSTALL FRONT DRIVE SHAFT ASSEMBLY RH
HINT:
Use ...
System Description
SYSTEM DESCRIPTION
1. POWER WINDOW CONTROL SYSTEM DESCRIPTION
(a) The power window control system controls the power window operation using
the power window regulator motors. The main controls of this system are the power
window regulator master switch assembly (mounted on the driver door), po ...