Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 718

SL-21

Keyless Entry System

SECURITY AND LOCKS

6. CHECK KEY WARNING SWITCH

Step

Check

Yes

No

1

CHECK KEY WARNING SWITCH.
1) Prepare the Subaru Select Monitor kit.
2) Run the “PC application for Subaru Select
Monitor”.
3) On «System Selection Menu» display,
select {Integ. unit mode}.
4) Select {Current Data Display & Save}.
5) Select the {key-lock warning SW}.

Is the normal input signal dis-
played when the key is inserted
in/removed from the ignition
switch?

The key warning
switch is OK.

Go to step

2.

2

CHECK FUSE.
Remove and visually check fuse No. 14 (in the
main fuse box).

Is the fuse blown out?

Replace the fuse
with a new part.

Go to step

3.

3

CHECK KEY WARNING SWITCH CIRCUIT.
1) Disconnect the harness connector of body
integrated unit.
2) Insert the key into ignition switch. (LOCK
position)
3) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

(B279) No. 2 (+) — Chassis ground (–):

Is the voltage 9 V or more?

Go to step

4.

Go to step

5.

4

CHECK KEY WARNING SWITCH CIRCUIT.
1) Remove the key from ignition switch.
2) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

(B279) No. 2 (+) — Chassis ground (–):

Is the voltage 1.5 V?

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

Go to step

5.

5

CHECK KEY WARNING SWITCH.
1) Disconnect the key warning switch harness
connector.
2) Insert the key into ignition switch. (LOCK
position)
3) Measure the resistance between key warn-
ing switch terminals.

Connector & terminal

(B350) No. 3 — No. 4:

Is the resistance less than 1 Ω? Go to step

6.

Replace the key
warning switch.

6

CHECK KEY WARNING SWITCH.
1) Remove the key from ignition switch.
2) Measure the resistance between key warn-
ing switch terminals.

Connector & terminal

(B350) No. 3 — No. 4:

Is the resistance 1 MΩ or
more?

Check the follow-
ing:
• Harness for
open circuits and
shorts between the
key warning switch
and fuse.
• Harness for
open or short
between the body
integrated unit and
key warning switch

Replace the key
warning switch.

SL-22

Keyless Entry System

SECURITY AND LOCKS

7. CHECK ROOM LIGHT OPERATION

8. CHECK HAZARD LIGHT OPERATION

Step

Check

Yes

No

1

CHECK ROOM LIGHT OPERATION.
Make sure the room light illuminates when the
room light switch is ON, and goes off when the
switch is OFF.

Does the room light illuminate
or go off?

Go to step

2.

Check the room
light circuit. <Ref.
to LI-34, INSPEC-
TION, Room
Light.>

2

CHECK ROOM LIGHT OPERATION.
1) Turn the room light switch to the “DOOR”
position.
2) Open/close any door (other than trunk).

Does the room light illuminate

←→ go off (including off delay)
when the door is opened and
closed?

Go to step

3.

Go to step

4.

3

CHECK KEYLESS ENTRY OPERATION.
Press the LOCK/UNLOCK button of the keyless
transmitter.

Does it operate properly?

The room light is
normal.

Check keyless
entry system.
<Ref. to SL-15,
SYMPTOM
CHART, INSPEC-
TION, Keyless
Entry System.>

4

CHECK ROOM LIGHT.
1) Disconnect the room light connector.
2) Check the room light. <Ref. to LI-34,
INSPECTION, Room Light.>

Is room light normal?

Go to step

5.

Replace the bulb
or room light
assembly.

5

CHECK HARNESS.
1) Disconnect the connector of body inte-
grated unit.
2) Check the harness between body inte-
grated unit connector and room light connector.

Connector & terminal

(B279) No. 5 — (R52) No. 2:

Is harness normal?

Go to step

6.

Repair or replace
the harness.

6

CHECK HARNESS.
Measure the voltage between room light har-
ness connector terminal and chassis ground.

Connector & terminal

(R52) No. 3 (+) — Chassis ground (–):

Is the voltage 10 V or more?

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

Repair or replace
the harness.

Step

Check

Yes

No

1

CHECK HAZARD LIGHT OPERATION.
Make sure the hazard light blinks when hazard
switch is turned to ON.

Does the hazard light blink?

Go to step

2.

Check the hazard
light circuit.

2

CHECK OUTPUT TO HAZARD LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector of key warning
switch.
3) Prepare the Subaru Select Monitor kit.
4) Turn the ignition switch to ON (engine OFF)
and run the “PC application for Subaru Select
Monitor”.
5) On «System Selection Menu» display,
select {Integ. unit mode}.
6) Select {Integ. Unit customizing}.
7) Check {Emergency light setup}, and then
switch to ON setting if necessary.
8) Select the {Current Data Display & Save}.
9) Select the {Hazard Output}.
10) Remove the key from ignition switch.

Is output signal present when
operating the transmitter
LOCK/UNLOCK button?

The hazard light
operation circuit is
OK.

Go to step

3.

SL-23

Keyless Entry System

SECURITY AND LOCKS

9. CHECK TRUNK LID LOCK ACTUATOR

3

CHECK HARNESS BETWEEN HAZARD
LIGHT AND BODY INTEGRATED UNIT.
1) Disconnect the body integrated unit connec-
tor and turn signal & hazard module connector.
2) Measure the resistance between body inte-
grated unit connector and turn signal & hazard
unit connector.

Connector & terminal

(B281) No. 22 — (B32) No. 8:

Is the resistance less than 10

Ω?

Check body inte-
grated unit. <Ref.
to LAN(diag)-2,
Basic Diagnostic
Procedure.>

Repair or replace
the harness.

Step

Check

Yes

No

1

CHECK UNLOCK OPERATION OF TRUNK
ALONE.
By using the keyless transmitter, perform the
UNLOCK operation of trunk alone.

Does answer-back occur?

Go to step

3.

Go to step

2.

2

CHECK KEYLESS ENTRY SYSTEM CIR-
CUIT.
1) Remove the keyless entry control module
from the vehicle with faults.
2) Install the keyless control module that was
removed to the other vehicle which is working
normally.
3) Perform the UNLOCK operation by using
the keyless transmitter of vehicle with faults.

Does UNLOCK occur?

Check body inte-
grated unit. <Ref.
to SL-48, Body
Integrated Unit.>

Check the follow-
ing:
• Keyless entry
control module
• Transmitter

3

CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor and trunk lid lock actuator connector.
2) Check the harness between body inte-
grated unit connector and trunk lid lock actuator
connector.

Connector & terminal

(i84) No. 22 — (R186) No. 2:

Is harness normal?

Go to step

4.

Repair or replace
the harness.

4

CHECK HARNESS.
Measure the resistance between the trunk lid
lock actuator connector and chassis ground.

Connector & terminal

(R186) No. 1 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

5.

Repair or replace
the harness.

5

CHECK TRUNK LID LOCK ACTUATOR.
Check the trunk lid lock actuator. <Ref. to SL-
38, Trunk Lid Latch and Actuator Assembly.>

Is trunk lid lock actuator nor-
mal?

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

Replace the trunk
lid latch & actuator
assembly.

Step

Check

Yes

No

SL-24

Keyless Entry System

SECURITY AND LOCKS

10.CHECK KEYLESS BUZZER

Step

Check

Yes

No

1

CHECK FUNCTION.
Using the Subaru Select Monitor, check
{Buzzer beeping setup}. <Ref. to LAN(diag)-19,
CONFIRM CURRENT SETTING, OPERA-
TION, Subaru Select Monitor.>

Is it ON?

Go to step

2.

Change the setting
to ON. <Ref. to
LAN(diag)-23,
USER CUSTOM-
IZING, OPERA-
TION, Subaru
Select Monitor.>

2

CHECK OUTPUT TO KEYLESS BUZZER.
1) Remove the key from ignition switch.
2) Display the {Keyless Buzzer Output} of the
body integrated unit using the Subaru Select
Monitor. <Ref. to LAN(diag)-13, READ DIAG-
NOSTIC TROUBLE CODE (DTC), OPERA-
TION, Subaru Select Monitor.>
3) Press the LOCK/UNLOCK button of the
keyless transmitter.
NOTE:

Due to the screen refresh timing of the Subaru
Select Monitor, repeat the operation a few times
to confirm, as there may be no change of OFF

→ ON at first.

Does display change from OFF

→ ON?

Go to step

3.

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

3

CHECK KEYLESS BUZZER.
1) Remove the keyless buzzer.
2) Install the keyless buzzer to another vehicle
which operates keyless buzzer normally, check
the buzzer sounds.

Does the keyless buzzer
sound?

Go to step

4.

Replace the key-
less buzzer.

4

CHECK HARNESS.
1) Disconnect the harness connector of body
integrated unit.
2) Disconnect the keyless buzzer harness con-
nector.
3) Measure the resistance between harness
connector terminals.

Connector & terminal

(B279) No. 24 — (B164) No. 1:

Is the resistance less than 10

Ω?

Go to step

5.

Repair or replace
the harness.

5

CHECK HARNESS.
Measure the resistance between the keyless
buzzer harness connector and chassis ground.

Connector & terminal

(B164) No. 2 — Chassis ground:

Is the resistance less than 10

Ω?

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

Repair or replace
the harness.