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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B1242 Wireless Tuner Abnormal >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK LAN SYSTEM. 
Inspect LAN system.
Is LAN system normal? Go to step . Perform the inspection according to the diagnosis for LAN system.
2 CHECK HARNESS. 
  1. Disconnect the keyless access CM connector.
  2. Disconnect the receiver connector.
  3. Using the tester, measure the resistance between terminals of keyless access CM connector and receiver connector, and keyless access CM and chassis ground.

    Connector & terminal 

    (i241) No. 19 - (R296) No. 2: 

    (i241) No. 17 - (R296) No. 5: 

    (i241) No. 5 - (R296) No. 4: 

    (R296) No. 1 - Chassis ground: 

Is the resistance less than 1 Ω? Go to step . Repair or replace the open circuit of harness.
3 CHECK HARNESS. 
Using a tester, measure the resistance between the keyless access CM connector and chassis ground.
Connector & terminal 
(i241) No. 19 - Chassis ground: 
(i241) No. 17 - Chassis ground: 
(i241) No. 5 - Chassis ground: 
Is the resistance 10 kΩ or more? Go to step . Repair or replace the short circuit of the harness.
4 CHECK RECEIVER. 
  1. Replace the receiver, and then connect it. < Refer to RECEIVER . >
  2. Using the Subaru Select Monitor, clear the memory.
  3. Use the Subaru Select Monitor and read DTCs.
Is B1242 displayed? Replace the keyless access CM. < Refer to KEYLESS ACCESS CM . > Receiver has a malfunction.