Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 715

SL-9

Door Lock Control System

SECURITY AND LOCKS

2. CHECK POWER SUPPLY AND GROUND CIRCUIT

3. CHECK DOOR LOCK SWITCH

Step

Check

Yes

CHECK POWER SUPPLY.
1) Disconnect the harness connector of body
integrated unit.
2) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

(i84) No. 34 (+) — Chassis ground (–):
(B280) No. 6 (+) — Chassis ground (–):
(B281) No. 2 (+) — Chassis ground (–):

Is the voltage 9 V or more?

Go to step

Check the harness
for open or short
circuit between
body integrated
unit and fuse.

CHECK GROUND CIRCUIT.
Measure the resistance between harness con-
nector terminal and chassis ground.

Connector & terminal

(i84) No. 28 — Chassis ground:
(B280) No. 17 — Chassis ground:
(B281) No. 20 — Chassis ground:
(B279) No. 27 — Chassis ground:

Is the resistance less than 10

Ω?

The power supply
and ground circuit
are OK.

Repair or replace
the harness.

Step

Check

Yes

CHECK DOOR LOCK SWITCH.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF)
and run the “PC application for Subaru Select
Monitor”.
3) On «System Selection Menu» display,
select {Integ. unit mode}.
4) Select the {Current Data Display & Save}.
5) Select the {Manual lock SW input}.

Does the display switch
between OFF ←→ ON when
each door lock switch is moved
to LOCK?

Go to step

CHECK DOOR LOCK SWITCH.
From the condition in step 1), operate each door
lock switch (driver’s and passenger’s) in the
UNLOCK direction.

Does the display switch
between OFF ←→ ON?

The door lock
switch is OK.

Go to step

CHECK DOOR LOCK SWITCH.
1) Disconnect the door lock switch harness
connector.
2) Check the continuity when the door lock
switch is operated to the LOCK direction.

Connector & terminal

Driver’s side:

(D7) No. 10 — (D102) No. 3:

Passenger’s side:

(D125) No. 4 — (D125) No. 5:

Did the indicator change from
“No continuity” (1 MΩ or more)
to “Continuity exists” (less than
10 Ω)?

Go to step

Replace the power
window main
switch or door lock
switch. <Ref. to
GW-9, Power Win-
dow Control
Switch.>

CHECK DOOR LOCK SWITCH.
Check the continuity when the door lock switch
is operated to the UNLOCK direction.

Connector & terminal

Driver’s side:

(D7) No. 2 — (D102) No. 3:

Passenger’s side:

(D125) No. 2 — (D125) No. 5:

Did the indicator change from
“No continuity” (1 MΩ or more)
to “Continuity exists” (less than
10 Ω)?

Go to step

Replace the power
window main
switch or door lock
switch. <Ref. to
GW-9, Power Win-
dow Control
Switch.>

SL-10

Door Lock Control System

SECURITY AND LOCKS

4. CHECK REAR GATE OPENER BUTTON CIRCUIT

CHECK HARNESS.
Use a tester to measure the resistance between
the door lock switch harness connector and
chassis ground.

Connector & terminal

Driver’s side:

(D102) No. 3 — Chassis ground:

Passenger’s side:

(D125) No. 5 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

Repair or replace
the harness.

CHECK HARNESS.
1) Disconnect the harness connector of body
integrated unit.
2) Measure the resistance between the body
integrated unit and door lock switch.

Connector & terminal

Driver’s side:

(D7) No. 10 — (i84) No. 15:
(D7) No. 2 — (i84) No. 29:

Passenger’s side:

(D125) No. 4 — (i84) No. 15:
(D125) No. 2 — (i84) No. 29:

Is the resistance less than 10

Ω?

Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>

Repair or replace
the harness.

Step

Check

Yes

CHECK REAR GATE OPENER BUTTON.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF)
and run the “PC application for Subaru Select
Monitor”.
3) On «System Selection Menu» display,
select {Integ. unit mode}.
4) Select the {Current Data Display & Save}.
5) Select the {Rear gate/Trunk release switch}.

Is the display change to OFF

←→ ON, when the rear gate
opener button is operated?

Rear gate opener
button is normal.

Go to step

CHECK HARNESS.
Check the harness between the body inte-
grated unit and rear gate opener button.

Connector & terminal

(B281) No. 24 — (D47) No. 1:

Is harness normal?

Go to step

Repair or replace
the harness.

CHECK HARNESS.
Measure the resistance between the rear gate
opener button and chassis ground.

Connector & terminal

(D47) No. 2 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

Repair or replace
the harness.

CHECK REAR GATE OPENER BUTTON.
Measure the resistance between connector ter-
minals when the rear gate opener button is
pressed, and when it is released.

Connector & terminal

(D47) No. 1 — (D47) No. 2:

Is the resistance less than 10 Ω
when the switch is pressed and
1 MΩ or more when not
pressed?

Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>

Replace the rear
gate opener but-
ton. <Ref. to SL-
36, Rear Gate
Opener Button.>

Step

Check

Yes

SL-11

Door Lock Control System

SECURITY AND LOCKS

5. CHECK DOOR LOCK ACTUATOR AND CIRCUIT

Step

Check

Yes

CHECK HARNESS (DOOR LOCK).
1) Disconnect the body integrated unit connec-
tor and each door lock actuator.
2) Check the harness between body inte-
grated unit and each door lock actuator.

Connector & terminal

(i84) No. 7 — (D72) No. 1: (front door LH)
(i84) No. 7 — (D18) No. 1: (front door RH)
(i84) No. 7 — (D26) No. 1: (rear door LH)
(i84) No. 7 — (D32) No. 1: (rear door RH)

Is harness normal?

Go to step

Repair or replace
the harness.

CHECK HARNESS (DOOR UNLOCK).
Check the harness between body integrated
unit and each door lock actuator.

Connector & terminal

(i84) No. 23 — (D72) No. 2: (front door LH)
(i84) No. 8 — (D18) No. 2: (front door RH)
(i84) No. 8 — (D26) No. 2: (rear door LH)
(i84) No. 8 — (D32) No. 2: (rear door RH)

Is harness normal?

Go to step

Repair or replace
the harness.

CHECK HARNESS (TRUNK OR REAR GATE
UNLOCK).
Check the harness between body integrated
unit and trunk lid lock actuator or rear gate lock
actuator.

Connector & terminal

(i84) No. 22 — (R186) No. 2: (4 door
model)
(i84) No. 22 — (D46) No. 1: (5 door model)

Is harness normal?

Go to step

Repair or replace
the harness.

CHECK HARNESS (TRUNK OR REAR GATE
UNLOCK).
Measure the resistance between the trunk lid
lock actuator or rear gate lock actuator and
chassis ground.

Connector & terminal

(R186) No. 1 — Chassis ground: (4 door
model)
(D46) No. 2 — Chassis ground: (5 door
model)

Is the resistance less than 10

Ω?

Go to step

Repair or replace
the harness.

CHECK BODY INTEGRATED UNIT OUTPUT
SIGNAL.
Measure the voltage between terminals of the
body integrated unit connector when operating
the door lock switch to LOCK direction.

Connector & terminal

Except for front door LH

(i84) No. 7 (+) — (i84) No. 8 (–):

Front door LH

(i84) No. 7 (+) — (i84) No. 23 (–):

Does the voltage change from
less than 1 V → 9 V or more?
(During lock output)

Go to step

Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>

CHECK BODY INTEGRATED UNIT OUTPUT
SIGNAL.
Measure the voltage between terminals of the
body integrated unit connector when operating
the door lock switch to UNLOCK direction.

Connector & terminal

Except for front door LH

(i84) No. 8 (+) — (i84) No. 7 (–):

Front door LH

(i84) No. 23 (+) — (i84) No. 7 (–):

Does the voltage change from
less than 1 V → 9 V or more?
(During unlock output)

Go to step

Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>

SL-12

Door Lock Control System

SECURITY AND LOCKS

CHECK BODY INTEGRATED UNIT OUTPUT
SIGNAL.
Measure the voltage between body integrated
unit and chassis ground when operating the
rear gate opener button.

Connector & terminal

(i84) No. 22 (+) — Chassis ground (–):

Does the voltage change from
less than 1 V → 9 V or more?
(During unlock output)

Go to step

Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>

CHECK DOOR LOCK ACTUATOR.
Check the door lock actuator.
• Front door lock actuator: <Ref. to SL-32,
INSPECTION, Front Door Latch and Door Lock
Actuator Assembly.>
• Rear door lock actuator: <Ref. to SL-35,
INSPECTION, Rear Door Latch and Door Lock
Actuator Assembly.>

Is the door lock actuator OK?

Go to step

Replace the door
latch and door lock
actuator assembly.

CHECK TRUNK LID LOCK ACTUATOR OR
REAR GATE LOCK ACTUATOR.
• Trunk lid lock actuator: <Ref. to SL-38,
INSPECTION, Trunk Lid Latch and Actuator
Assembly.>
• Rear gate lock actuator: <Ref. to SL-37,
INSPECTION, Rear Gate Latch and Actuator
Assembly.>

Is trunk lid lock actuator or rear
gate lock actuator normal?

Check the connec-
tion status of the
harness and con-
nector that may
have a temporary
poor contact.