DTC B1017: Collision Detection Signal Input

DTC detecting condition: 

Detected when error occurred in the collision detection signal.

Time needed for diagnosis: 

150 ms 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  .

   Read the DTC of body integrated unit using Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read 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 the airbag using the Subaru Select Monitor. Ref. to AIRBAG SYSTEM (DIAGNOSTICS)>READ 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, disconnect the battery ground cable, and wait for 60 seconds or more.
   2. Disconnect the airbag Control Module connector.
   3. Disconnect the body integrated unit connector.
   4. Disconnect the DCM connector. (With telematics)
   5. 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 SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION .

   Connector & terminal

   (i81) No. 11 - (AB6) No. 27:

   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 & terminal

   (i81) No. 11 - 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 THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY)  .

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

   Connector & terminal

   (i81) No. 11 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

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