Subaru Legacy III (2000-2003 year). Service manual — part 963

SL-8

SECURITY AND LOCKS

DOOR LOCK CONTROL SYSTEM

2. Door Lock Control System

A: SCHEMATIC

<Ref. to WI-240, SCHEMATIC, Keyless Entry System.>

B: INSPECTION

1. SYMPTOM CHART

2. CHECK FUSE

Symptom

Repair order

Reference

Door lock control system does not
operate.

1. Check the fuse.

<Ref. to SL-8, CHECK FUSE, INSPECTION,
Door Lock Control System.>

2. Check the power supply and ground
circuit for keyless entry control module.

<Ref. to SL-9, CHECK POWER SUPPLY AND
GROUND CIRCUIT, INSPECTION, Door Lock
Control System.>

3. Check the door lock switch and the
circuit.

<Ref. to SL-9, CHECK DOOR LOCK SWITCH
AND CIRCUIT, INSPECTION, Door Lock Con-
trol System.>

4. Check the door lock actuator and the
circuit.

<Ref. to SL-10, CHECK DOOR LOCK ACTUA-
TOR AND CIRCUIT, INSPECTION, Door Lock
Control System.>

Door lock switch (knob) does not
operate.

Check the door lock switch and the cir-
cuit.

<Ref. to SL-9, CHECK DOOR LOCK SWITCH
AND CIRCUIT, INSPECTION, Door Lock Con-
trol System.>

A specific door lock actuator does not
operate.

Check the door lock actuator and the
circuit.

<Ref. to SL-10, CHECK DOOR LOCK ACTUA-
TOR AND CIRCUIT, INSPECTION, Door Lock
Control System.>

Step

Value

Yes

No

1

CHECK FUSE.
Remove and visually check fuse No. 2 (in the
main fuse box) and No. 3 (in the fuse and relay
box).
Is the fuse blown?

The fuse is not blown.

Check power sup-
ply and ground cir-
cuit. <Ref. to SL-9,
CHECK POWER
SUPPLY AND
GROUND CIR-
CUIT, INSPEC-
TION, Door Lock
Control System.>

Replace the fuse
with a new one.

SL-9

SECURITY AND LOCKS

DOOR LOCK CONTROL SYSTEM

3. CHECK POWER SUPPLY AND GROUND CIRCUIT

4. CHECK DOOR LOCK SWITCH AND CIRCUIT

Step

Value

Yes

No

1

CHECK POWER SUPPLY.
1) Disconnect the keyless entry control mod-

ule harness connector.

2) Measure the voltage between the harness

connector terminal and chassis ground.

Connector & terminal

(B176) No. 5 (+) — Chassis ground (–):
(B176) No. 16 (+) — Chassis ground (–):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

Check the harness
for open circuits or
shorts between
the keyless entry
control module
and the fuse.

2

CHECK GROUND CIRCUIT.
Measure the resistance between the harness
connector terminal and chassis ground.

Connector & terminal

(B176) No. 6 — Chassis ground:
(B176) No. 14 — Chassis ground:

Is the measured value less than the specified
value?

10

Ω

Power supply and
ground circuit are
OK.

Repair harness.

Step

Value

Yes

No

1

CHECK DOOR LOCK SWITCH CIRCUIT.
1) Disconnect the keyless entry control mod-

ule harness connector.

2) Measure the resistance between the har-

ness connector terminal and chassis
ground when moving the driver's door lock
knob to UNLOCK.

Connector & terminal

(B176) No. 7 — Chassis ground:

Is the measured value less than the speci-
fied value?

10

Ω

Go to step 2.

Go to step 3.

2

CHECK DOOR LOCK SWITCH CIRCUIT.
Measure the resistance between the harness
connector terminal and chassis ground when
the driver's door lock knob is moved to LOCK.

Connector & terminal

(B176) No. 7 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

The door lock
switch is OK.

Go to step 3.

3

CHECK DOOR LOCK SWITCH.
1) Disconnect the driver's door lock switch

(actuator) harness connector.

2) Measure the resistance between the door

lock switch terminals when moving the door
lock knob to UNLOCK.

Terminal

No. 1 — No. 3:

Is the measured value less than the speci-
fied value?

1

Ω

Go to step 4.

Replace the door
lock switch (actua-
tor).

SL-10

SECURITY AND LOCKS

DOOR LOCK CONTROL SYSTEM

5. CHECK DOOR LOCK ACTUATOR AND CIRCUIT

4

CHECK DOOR LOCK SWITCH.
Measure the resistance between the door lock
switch terminals when moving the door lock
knob to LOCK.

Terminal

No. 1 — No. 3:

Does the measured value exceed the specified
value?

1 M

Ω

Check the harness
for open circuits or
shorts between
the keyless entry
control module
and the door lock
switch.

Replace the door
lock switch (actua-
tor).

Step

Value

Yes

No

1

CHECK OUTPUT SIGNAL.
Measure the voltage between the harness con-
nector terminal of keyless entry control module
and chassis ground when moving the door lock
knob to LOCK.

Connector & terminal

(B176) No. 18 (+) — Chassis ground (–):

Does the measured value exceed the specified
value?

10 V

Go to step 2.

Replace the key-
less entry control
module.

2

CHECK OUTPUT SIGNAL.
Measure the voltage between the harness con-
nector terminal of keyless entry control module
and chassis ground when moving the door lock
knob to UNLOCK.

Connector & terminal

(B176) No. 17 (+) — Chassis ground (–):

Does the measured value exceed the specified
value?

10 V

Go to step 3.

Replace the key-
less entry control
module.

3

CHECK DOOR LOCK ACTUATOR.
Check the door lock actuator.
Front door lock actuator: <Ref. to SL-22, Front
Door Lock Actuator.>
Rear door lock actuator: <Ref. to SL-26, Rear
Door Lock Actuator.>
Rear gate latch lock actuator: <Ref. to SL-29,
Rear Gate Latch Lock Actuator.>
Is the door lock actuator OK?

The door lock actuator is OK.

Check the harness
for open circuits or
shorts between
the keyless entry
control module
and the door lock
actuator.

Replace the door
lock actuator.

Step

Value

Yes

No

SL-11

SECURITY AND LOCKS

KEYLESS ENTRY SYSTEM

3. Keyless Entry System

A: SCHEMATIC

<Ref. to WI-240, SCHEMATIC, Keyless Entry System.>

B: ELECTRICAL SPECIFICATION

Content

Terminal No.

Measuring condition

Key warning switch

1 (INPUT)

Battery voltage is present when inserting the key into the ignition switch.

Registration connector

2 (INPUT)

0 V is detected when connecting the registration connector.

Door switch

3 (INPUT)

0 V is detected when any door is open.

Rear gate switch

4 (INPUT)

0 V is detected when opening the rear gate.

Power supply

5

Battery voltage is constantly detected.

Ground

6

0 V is constantly detected.

Door lock switch

7 (INPUT)

0 V is detected when driver's door is unlocked.

Empty

8

—

Empty

9

—

Empty

10

—

Room light/Ignition switch illumina-
tion

11 (OUTPUT)

• 0 V is detected when pressing the transmitter OPEN button.
• 0 V is detected when any door is open.

Turn signal light (Right)

12 (OUTPUT)

Battery voltage is detected when pressing the transmitter OPEN or
LOCK button.

Turn signal light (Left)

13 (OUTPUT)

Battery voltage is detected when pressing the transmitter OPEN or
LOCK button.

Ground

14

0 V is constantly detected.

Power supply (Hazard light)

15

Battery voltage is constantly detected.

Power supply

16

Battery voltage is constantly detected.

Door and rear gate lock actuator
(Unlock)

17 (OUTPUT)

Battery voltage is detected when pressing the transmitter OPEN button.

Door and rear gate lock actuator
(Lock)

18 (OUTPUT)

Battery voltage is detected when pressing the transmitter LOCK button.

SL-00118

18 17 16 15 14 13 12 11

1

6

8 7

10 9

2

4 3

5