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.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to BODY CONTROL (DIAGNOSTICS)>General Description>CAUTION .

CHECK DTC .
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.
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.
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 & terminal
  
  (i81) No. 31 - (AB6) No. 38:
Is the resistance less than 10 Ω?

Yes : Go to 4.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Measure the resistance between body integrated unit connector and chassis ground using tester.

Connector & terminal

(i81) 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.
CHECK THE CONNECTOR (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 & terminal
  
  (i81) No. 31 (+) - 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.