DTC    B27A5    Open in Front Floor Electrical Key Oscillator Circuit

for Preparation Click here


DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the indoor electrical key oscillator (front side). The indoor electrical key oscillator (front side) detects that the electrical key is inside the vehicle and transmits the request signal received from the certification ECU. DTC B27A5 is stored by the certification ECU when an open is detected in the terminals between the certification ECU and indoor electrical key oscillator (front side) (CLG5 - CLG3, CG5B - CLGB).

DTC Code
DTC Detection Condition
Trouble Area
B27A5
Open is detected in the terminals between the certification ECU and indoor electrical key oscillator (front side) (CLG5 - CLG3, CG5B - CLGB).
  1. Wire harness or connector
  2. Indoor electrical key oscillator (front side)
  3. Certification ECU

WIRING DIAGRAM


B210705E01


INSPECTION PROCEDURE

NOTICE:
When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3, and turn a courtesy light switch on and off at 1.5-second intervals until communication between the tester and vehicle begins

1.CHECK CONNECTOR CONNECTION CONDITION

  1. Turn the engine switch off.

  1. Check that the connectors are properly connected to the certification ECU and the Indoor electrical key oscillator (front side).

    OK:
    Connectors are properly connected.



NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK HARNESS AND CONNECTOR (INDOOR ELECTRICAL KEY OSCILLATOR - CERTIFICATION ECU)
B199955E01

  1. Disconnect the certification ECU connector.

  1. Disconnect the indoor electrical key oscillator (front side) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D32-1 (CLG3) - D34-7 (CLG5)
    		Always
    		Below 1 Ω
    D32-3 (CLGB) - D34-8 (CG5B)
    		Always
    		Below 1 Ω
    D34-7 (CLG5) - Body ground
    		Always
    		10 kΩ or higher
    D34-8 (CG5B) - Body ground
    		Always
    		10 kΩ or higher

Text in Illustration 
*1
Front view of wire harness connector
(to Indoor Electrical Key Oscillator)
*2
Front view of wire harness connector
(to Certification ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT CERTIFICATION ECU
B215215E03

  1. Reconnect the certification ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-15 (E) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the pulse generation according to the value(s) in the table below.

    OK:
    Tester Connection
    		Condition
    		Specified Condition
    D34-7 (CLG5) - D34-15 (E)
    		Engine switch off, all doors closed, key not in the cabin, and lock sensor off
    		No pulse generation
    D34-7 (CLG5) - D34-15 (E)
    		Engine switch off, all doors closed, key not in the cabin, and lock sensor ON
    		Pulse generation
    D34-8 (CG5B) - D34-15 (E)
    		Engine switch off, all doors closed, key not in the cabin, and lock sensor off
    		No pulse generation
    D34-8 (CG5B) - D34-15 (E)
    		Engine switch off, all doors closed, key not in the cabin, and lock sensor ON
    		Pulse generation

    Text in Illustration 
    *1
    		Component with harness connected
    (Certification ECU)



NG
REPLACE CERTIFICATION ECU
OK


4.REPLACE INDOOR ELECTRICAL KEY OSCILLATOR (FRONT SIDE)

  1. Temporarily replace the indoor electrical key oscillator (front side) with a new or normally functioning one (Click here).


NEXT


5.CHECK DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs (Click here).

    OK:
    B27A5 output does not recur.



NG
REPLACE CERTIFICATION ECU
OK

END (INDOOR ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)