LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2017 >> Outback 2.5i >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B27A5: Front Internal Antenna Open

DTC B27A5: Front Internal Antenna Open

DTC detecting condition: 

When open circuit occurs in the harness between keyless access Control Module and front interior antenna.

Trouble symptom: 

Keyless access system does not function. (when the access key is in the front area of the passenger room)

CAUTION: For replacement procedure of keyless access Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

Wiring diagram: 

NOTE: For the coupling connector, refer to "WIRING SYSTEM".

Keyless access with push button start system Ref. to WIRING DIAGRAM , Keyless Access With Push Button Start System.

Fig 1: Keyless Access Control Module Wiring Diagram
G10312009Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Front Interior Antenna Wiring Diagram
G11567954Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK LAN SYSTEM. 
Inspect LAN system. Ref. to PROCEDURE , Basic Diagnostic Procedure.		 Is the check result OK? Go to step 2  Perform the inspection according to the diagnosis for LAN system.
2 CHECK CONNECTOR. 
  1. Disconnect the keyless access Control Module connector.
  2. Disconnect the front interior antenna connector.
  3. Check the connector.
 Is the check result OK? Go to step 3  Repair or replace the connector.
3 CHECK POWER SUPPLY CIRCUIT. 
Using a tester, measure the voltage between the keyless access Control Module connector and chassis ground.
Connector & terminal 
(i75) No. 24 (+) - Chassis ground (-): 		 Is the voltage 9.5 - 16 V? Go to step 4  Check the power supply circuit.
4 CHECK HARNESS (OPEN CIRCUIT). 
Using a tester, measure the resistance between the keyless access Control Module connector and front interior antenna connector, and between front interior antenna connector, keyless access Control Module connector and chassis ground.
Connector & terminal 
(i241) No. 1 - (i71) No. 3: 
(i241) No. 2 - (i71) No. 1: 
(i75) No. 1 - Chassis ground: 
(i241) No. 21 - Chassis ground: 		 Is the resistance less than 1 Ω? Go to step 5  Repair or replace the open circuit of harness.
5 CHECK HARNESS (GROUND SHORT CIRCUIT). 
Using a tester, measure the resistance between the keyless access Control Module connector and chassis ground.
Connector & terminal 
(i241) No. 1 - Chassis ground: 
(i241) No. 2 - Chassis ground: 		 Is the resistance 10 kΩ or more? Go to step 6  Repair or replace the short circuit of the harness.
6 CHECK DTC. 
  1. Connect the keyless access Control Module connector.
  2. Using the Subaru Select Monitor, clear the memory. Ref. to CLEAR MEMORY MODE 
  3. Read the DTC using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) 
 Is DTC B27A5 displayed? Go to step 7  Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
7 CHECK FRONT INTERIOR ANTENNA. 
  1. Replace the rear interior antenna with the front interior antenna. Ref. to KEYLESS ACCESS INDOOR ANTENNA
  2. Using the Subaru Select Monitor, clear the memory. Ref. to CLEAR MEMORY MODE 
  3. Read the DTC using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) 
 Is DTC B27A5 displayed? Replace the keyless access Control Module. Ref. to KEYLESS ACCESS CONTROL MODULE Malfunction occurred in the front interior antenna.
scientia non olet · About LEMON Manuals