Key Interlock Cannot Be Locked Or Released

Ref. to CONTROL SYSTEMS>AT Shift Lock Control System>INSPECTION>BODY INTEGRATED UNIT POWER SUPPLY AND GROUND CIRCUIT 

Is there any fault?

Yes:  Follow the procedures to inspect and repair.

No:  2

1. Connect the Subaru Select Monitor.
2. Shift the select lever to "P" range.
3. Turn the ignition switch to ON.
4. Select the current data display and display «P SW». Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Current Data

Is the display "ON" in the P range and "OFF" in ranges other than P?

Yes:  3

No:  6

1. Select the current data display and display the «key-lock warning SW». Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Current Data
2. Turn the ignition switch to OFF.

Does the display change from "ON" ←→ "OFF" when the key is inserted and removed?

Yes:  4

No:  9

1. Turn the ignition switch to ON.
2. Select the current data display and display «Key lock solenoid output». Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Current Data

Is the display "OFF" in the P range and "ON" in ranges other than P?

Yes:  10

No:  5

1. Set the select lever to other than "P" range.
2. Check DTC of body integrated unit.

Is B1015 (key interlock circuit abnormal) a current malfunction?

Yes:  Follow the DTC to perform inspection and repair.

No:  10

1. Disconnect the connector from body integrated unit.
2. Disconnect the connector of "P" range switch.
3. Check for open circuit of harness, short circuit to battery or short circuit to ground between the body integrated unit and "P" range switch.

   Connector & Terminal 

   (B281) No. 18 - (B116) No. 1:

   Is there any fault in the harness?

Yes:  Repair or replace the harness between the body integrated unit and the "P" range switch.

No:  7

Measure the resistance of harness between "P" range switch and chassis ground.

Connector & Terminal 

(B116) No. 2 - Chassis ground:

Is it less than 10 Ω?

Yes:  8

No:  Repair or replace the harness between the "P" range switch and chassis ground.

Measure the resistance between "P" range switch connector terminals.

Terminals 

No. 2 - No. 1:

Is it less than 10 Ω in the "P" range, and 1 MΩ or more in ranges other than "P"?

Yes:  Replace the body integrated unit.

No:  Replace the "P" Range Switch.

1. Disconnect the connector from body integrated unit.
2. Measure the voltage between body integrated unit and chassis ground.

   Connector & Terminal 

   (B280) No. 4 (+) - Chassis ground (-):

Is the display 9 V or more when the key is inserted, and less than 1.5 V with the key removed?

Yes:  Replace the body integrated unit.

No:  Check the following items.

• Key warning switch
• Harness/fuse
• Ignition circuit

1. Disconnect the connector from body integrated unit.
2. Disconnect the connector of key lock solenoid.
3. Check for open circuit of harness, short circuit to battery or short circuit to ground between the body integrated unit and key lock solenoid.

   Connector & Terminal 

   (B281) No. 4 - (B557) No. 1:

Is there any fault in the harness?

Yes:  Repair or replace the harness between the body integrated unit and the key lock solenoid.

No:  11

Measure the resistance of harness between key lock solenoid and chassis ground.

Connector & Terminal 

(B557) No. 2 - Chassis ground:

Is it less than 10 Ω?

Yes:  12

No:  Repair or replace the harness between the key lock solenoid and chassis ground.

Connect the battery to the key lock solenoid connector terminal, and operate the solenoid.

Terminals 

No. 2 (+) - No. 1 (-):

Does the key lock solenoid operate normally?

Yes:  13

No:  Replace the key lock solenoid.

1. Connect all connectors.
2. Insert the key.
3. Measure the voltage between body integrated unit and chassis ground.

Connector & Terminal 

(B281) No. 4 - Chassis ground:

Is it 7.5 V to 16 V in ranges other than "P", and approx. 0 V in the "P" range?

Yes:  Check the lock mechanism of the steering lock body.

No:  Replace the body integrated unit.