Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 717

SL-17

Keyless Entry System

SECURITY AND LOCKS

2. CHECK KEYLESS TRANSMITTER BATTERY AND FUNCTION

CAUTION:

Be sure to reset keyless transmitter of other vehicles registered to the inspection target vehicle, and

vehicles to which keyless transmitters were registered for inspection, to the condition before per-

forming the inspection. (Re-register the keyless transmitters.)

Step

Check

Yes

No

1

CHECK KEYLESS TRANSMITTER BAT-
TERY.
1) Remove the battery from the keyless trans-
mitter. <Ref. to SL-49, REMOVAL, Transmitter.>
2) Check the battery voltage. <Ref. to SL-49,
INSPECTION, Transmitter.>

Is the voltage 2.5 V or more?

Go to step

2.

Replace the key-
less transmitter
battery. <Ref. to
SL-49, Transmit-
ter.>

2

CHECK KEYLESS TRANSMITTER.
Register the keyless transmitter which operates
normally on other vehicles to the inspection tar-
get vehicle. <Ref. to SL-49, REGISTRATION
OF KEYLESS TRANSMITTER WITH SUBARU
SELECT MONITOR, REPLACEMENT, Trans-
mitter.>
1) Close all the doors and rear gate (5 door
model) or trunk lid (4 door model) of the inspec-
tion target vehicle.
2) Using the keyless transmitter, lock and
unlock the doors and rear gate of vehicle.
For the 4 door model, unlock the trunk lid.

Can the check vehicle be
locked and unlocked properly?

Go to step

3.

Due to vehicle mal-
function, continue
the keyless entry
system diagnosis.

3

CHECK KEYLESS TRANSMITTER.
Register the keyless transmitter of the
inspected vehicle to another vehicle whose key-
less system operates normally. <Ref. to SL-49,
REGISTRATION OF KEYLESS TRANSMIT-
TER WITH SUBARU SELECT MONITOR,
REPLACEMENT, Transmitter.>

Is the keyless transmitter regis-
tered correctly?

Go to step

4.

Replace the key-
less transmitter.
<Ref. to SL-49,
REGISTRATION
OF KEYLESS
TRANSMITTER
WITH SUBARU
SELECT MONI-
TOR, REPLACE-
MENT,
Transmitter.>

4

CHECK KEYLESS TRANSMITTER.
Check the registered keyless transmitter.
1) Close all the doors and rear gate of the vehi-
cle which keyless system operates normally.
2) Using the keyless transmitter, lock and
unlock the doors and rear gate of vehicle.
For the 4 door model, unlock the trunk lid.

Can lock, unlock of doors and
unlock of the trunk lid be per-
formed properly on the vehicle?

Keyless transmitter
is OK.

Replace the key-
less transmitter.
<Ref. to SL-49,
REGISTRATION
OF KEYLESS
TRANSMITTER
WITH SUBARU
SELECT MONI-
TOR, REPLACE-
MENT,
Transmitter.>

SL-18

Keyless Entry System

SECURITY AND LOCKS

3. CHECK KEYLESS ENTRY CONTROL MODULE

4. CHECK BODY INTEGRATED UNIT POWER SUPPLY AND GROUND CIRCUIT

Refer to the INSPECTION of POWER SUPPLY AND GROUND CIRCUIT of the Door Lock Control System

for detailed procedures. <Ref. to SL-9, CHECK POWER SUPPLY AND GROUND CIRCUIT, INSPECTION,

Door Lock Control System.>

Step

Check

Yes

No

1

CHECK DIAGNOSTIC TROUBLE CODE
(DTC).
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 {Diagnostic Code(s) Display}.

Is DTC B1500 “Keyless UART
com. Malfunction” displayed?

Go to step

2.

Keyless entry con-
trol module is nor-
mal.

2

CHECK POWER SUPPLY.
1) Disconnect the keyless entry control mod-
ule harness connector.
2) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

Model without tire pressure monitoring
system:

(R80) No. 4 (+) — Chassis ground (–):

Model with tire pressure monitoring sys-
tem:

(R221) No. 6 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step

3.

Check the harness
for open circuits
and shorts
between the key-
less entry control
module and fuse.

3

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

Connector & terminal

Model without tire pressure monitoring
system:

(R80) No. 7 — Chassis ground:

Model with tire pressure monitoring sys-
tem:

(R221) No. 5 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

4.

Repair or replace
the harness.

4

CHECK KEYLESS ENTRY CONTROL MOD-
ULE CIRCUIT.
1) Disconnect the harness connector of body
integrated unit.
2) Measure the resistance between harness
connector terminals.

Connector & terminal

Model without tire pressure monitoring
system:

(i84) No. 24 — (R80) No. 3:

Model with tire pressure monitoring sys-
tem:

(i84) No. 24 — (R221) No. 11:

Is the resistance less than 10

Ω?

Replace the key-
less entry control
module. <Ref. to
SL-46, Keyless
Entry Control Mod-
ule.>

Repair or replace
the harness.

SL-19

Keyless Entry System

SECURITY AND LOCKS

5. CHECK DOOR SWITCH

Step

Check

Yes

No

1

CHECK INPUT CIRCUIT.
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}.
5) Select the {Driver’s door SW input}, {P-door
SW input}, {Rear right door SW input}, {Rear left
door SW input}, and {R Gate SW input}.

Does the display switch
between OFF ←→ ON when
each door, rear gate or trunk lid
is opened/closed?

The door switches,
trunk lid latch
switch or rear gate
latch switch circuit
are normal.

Go to step

2.

2

CHECK HARNESS.
1) Disconnect the harness connector of body
integrated unit.
2) Disconnect the door switch harness con-
nector that the display does not change.
3) Check the harness between body inte-
grated unit terminal and defective door switch
terminal.

Connector & terminal

Front door RH

(i84) No. 32 — (R12) No. 1:

Front door LH

(i84) No. 19 — (R9) No. 1:

Rear door RH

(i84) No. 6 — (R16) No. 1:

Rear door LH

(i84) No. 20 — (R22) No. 1:

Trunk lid latch switch

(i84) No. 33 — (R186) No. 3:

Rear gate latch switch

(i84) No. 33 — (D46) No. 3:

Is harness normal?

Go to step

3.

Repair or replace
the harness.

3

CHECK HARNESS.
Measure the resistance between defective door
switch, trunk lid latch switch or rear gate latch
switch terminals and chassis ground.

Connector & terminal

Front door RH

(R12) No. 3 — Chassis ground:

Front door LH

(R9) No. 3 — Chassis ground:

Rear door RH

(R16) No. 3 — Chassis ground:

Rear door LH

(R22) No. 3 — Chassis ground:

Trunk lid latch switch

(R186) No. 1 — Chassis ground:

Rear gate latch switch

(D46) No. 4 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

4.

Repair or replace
the harness.

SL-20

Keyless Entry System

SECURITY AND LOCKS

4

CHECK DOOR SWITCH.
Measure the resistance between terminals of
faulty door switch, trunk lid switch or rear gate
latch switch.

Connector & terminal

(R12) Front RH door switch

No. 1 — No. 3:

(R9) Front LH door switch

No. 1 — No. 3:

(R16) Rear RH door switch

No. 1 — No. 3:

(R22) Rear LH door switch

No. 1 — No. 3:

Trunk lid latch switch

(R186) No. 1 — No. 3:

Rear gate latch switch

(D46) No. 3 — No. 4:

Is the resistance 1 MΩ or more
when the door switch is
pushed, or the trunk lid or rear
gate is closed?

Go to step

5.

Replace the follow-
ing parts if defec-
tive.
• Door switch
• Trunk lid latch
and actuator ASSY
• Rear gate latch
and actuator ASSY

5

CHECK DOOR SWITCH.
Measure the resistance between terminals of
faulty door switch, trunk lid switch or rear gate
latch switch.

Connector & terminal

(R12) Front RH door switch

No. 1 — No. 3:

(R9) Front LH door switch

No. 1 — No. 3:

(R16) Rear RH door switch

No. 1 — No. 3:

(R22) Rear LH door switch

No. 1 — No. 3:

Trunk lid switch

(R186) No. 1 — No. 3:

Rear gate latch switch

(D46) No. 3 — No. 4:

Is the resistance less than 10 Ω
when door switch is released,
or the trunk lid or rear gate is
opened?

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

Replace the follow-
ing parts if defec-
tive.
• Door switch
• Trunk lid latch
and actuator ASSY
• Rear gate latch
and actuator ASSY

Step

Check

Yes

No