DTC B1017: Collision Detection Signal Input

DTC detecting condition: 

Detected when error occurred in the collision detection signal.

Time needed for diagnosis: 

3 s or more

Trouble symptom: 

The auto door lock or auto door unlock does not operate.

Wiring diagram: 

Airbag system Ref. to WIRING SYSTEM>AIRBAG SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to Body Control (Diagnostics)>Diagnostic Trouble Code (DTC) .

   Is DTC B1017 displayed? (Current malfunction)

   Yes:  Go to  2 .

   No:  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. 

2. CHECK DTC  .

   Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed? (Current malfunction)

   Yes:  Perform the diagnosis for the displayed DTCs of airbag.

   No:  Go to  3 .

3. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
   2. Disconnect the airbag control module connector.
   3. Disconnect the body integrated unit connector.
   4. Using a tester, measure the resistance between the airbag control module connector and body integrated unit connector.
      CAUTION:

      To measure the voltage and resistance of airbag system component, be sure to use the specified test harness. Ref. to  AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION  . 

      Connector and terminal 

      (i83) No. 31 - (AB42) No. 39:

   Is the resistance less than 10 Ω?

   Yes:  Go to  4 .

   No:  Repair or replace the open circuit of harness.

4. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Measure the resistance between body integrated unit connector and chassis ground using tester.

   Connector and terminal 

   (i83) No. 31 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  5 .

   No:  Repair or replace the short circuit of the harness.

5. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY)  .
   1. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
   2. Measure the voltage between body integrated unit connector and chassis ground using tester.

      Connector and terminal 

      (i83) No. 31 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes:  Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

   No:  Repair or replace the short circuit of the harness.