Subaru Legacy III (2000-2003 year). Service manual — part 964
SL-12
SECURITY AND LOCKS
KEYLESS ENTRY SYSTEM
C: INSPECTION
1. SYMPTOM CHART
Symptom
Repair order
Reference
None of the functions of the keyless
entry system operate.
1. Check the transmitter battery.
<Ref. to SL-13, CHECK TRANSMITTER BAT-
TERY, INSPECTION, Keyless Entry System.>
2. Check the fuse.
<Ref. to SL-13, CHECK FUSE, INSPECTION,
Keyless Entry System.>
3. Check the keyless entry control mod-
ule power supply and ground circuit.
<Ref. to SL-13, CHECK POWER SUPPLY AND
GROUND CIRCUIT, INSPECTION, Keyless
Entry System.>
4. Replace the keyless entry control
module.
<Ref. to SL-38, Keyless Entry Control Module.>
Transmitter cannot be registered.
1. Check the transmitter battery.
<Ref. to SL-13, CHECK TRANSMITTER BAT-
TERY, INSPECTION, Keyless Entry System.>
2. Check the registration connector cir-
cuit.
<Ref. to SL-14, CHECK REGISTRATION CON-
NECTOR CIRCUIT, INSPECTION, Keyless
Entry System.>
3. Replace the keyless entry control
module.
<Ref. to SL-38, Keyless Entry Control Module.>
Door lock or unlock does not operate.
NOTE:
If the door lock control system does
not operate when using the door lock
switch, check the door lock control
system. <Ref. to SL-8, INSPECTION,
Door Lock Control System.>
1. Check the transmitter battery.
<Ref. to SL-13, CHECK TRANSMITTER BAT-
TERY, INSPECTION, Keyless Entry System.>
2. Check the key warning switch.
<Ref. to SL-16, CHECK KEY WARNING
SWITCH, INSPECTION, Keyless Entry Sys-
tem.>
3. Check the door switch.
<Ref. to SL-15, CHECK DOOR SWITCH,
INSPECTION, Keyless Entry System.>
4. Replace the keyless entry control
module.
<Ref. to SL-38, Keyless Entry Control Module.>
Hazard light does not operate.
1. Check the hazard light operation.
<Ref. to SL-17, CHECK HAZARD LIGHT
OPERATION, INSPECTION, Keyless Entry
System.>
2. Replace the keyless entry control
module.
<Ref. to SL-38, Keyless Entry Control Module.>
Room light and ignition switch illumi-
nation operation does not activate.
1. Check the room light operation.
<Ref. to SL-17, CHECK ROOM LIGHT OPERA-
TION, INSPECTION, Keyless Entry System.>
2. Check the ignition switch illumination
circuit.
<Ref. to SL-18, CHECK IGNITION SWITCH
ILLUMINATION CIRCUIT, INSPECTION, Key-
less Entry System.>
3. Replace the keyless entry control
module.
SL-13
SECURITY AND LOCKS
KEYLESS ENTRY SYSTEM
2. CHECK TRANSMITTER BATTERY
3. CHECK FUSE
4. CHECK POWER SUPPLY AND GROUND CIRCUIT
Step
Value
Yes
No
1
CHECK TRANSMITTER BATTERY.
1) Remove the battery from the transmitter.
<Ref. to SL-39, REMOVAL, Keyless Trans-
mitter.>
2) Check the battery voltage. <Ref. to SL-39,
INSPECTION, Keyless Transmitter.>
Does the measured value exceed the spec-
ified value?
2 V
The transmitter
battery is OK. Fur-
ther inspection is
necessary, refer to
“SYMPTOM
CHART”. <Ref. to
SL-12, SYMP-
TOM CHART,
INSPECTION,
Keyless Entry Sys-
tem.>
Replace the trans-
mitter battery.
Step
Value
Yes
No
1
CHECK FUSE.
Remove and visually check fuse No. 2 (in the
main fuse box), No. 3 (in the fuse and relay
box) and SBF-6 (in the main fuse box)
Is the fuse blown?
The fuse is not blown.
Check power sup-
ply and ground cir-
cuit. <Ref. to SL-
13, CHECK
POWER SUPPLY
AND GROUND
CIRCUIT,
INSPECTION,
Keyless Entry Sys-
tem.>
Replace the fuse
with a new one.
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, No. 16 (+) — Chassis
ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Check the harness
for open circuits or
shorts between
the keyless entry
control module
and fuse.
2
CHECK GROUND CIRCUIT.
Measure the resistance between the harness
connector terminal and chassis ground.
Connector & terminal
(B176) No. 6, No. 14 — Chassis ground:
Is the measured value less than the specified
value?
10
Ω
The power supply
and ground circuit
are OK.
Repair the har-
ness.
SL-14
SECURITY AND LOCKS
KEYLESS ENTRY SYSTEM
5. CHECK REGISTRATION CONNECTOR CIRCUIT
Step
Value
Yes
No
1
REGISTRATION CONNECTOR INPUT VOLT-
AGE INSPECTION
1) Turn ignition switch ON.
2) Disconnect registration connector.
3) Measure voltage between keyless entry
control module harness connector and
chassis ground.
Connector & terminal
(B176) No. 2 (+) — Chassis ground (
−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair harness,
and (or) connec-
tor.
2
REGISTRATION CONNECTOR INPUT VOLT-
AGE INSPECTION
1) Connect registration connector.
2) Measure voltage between keyless entry
control module harness connector and
chassis ground.
Connector & terminal
(B176) No. 2 (+) — Chassis ground (
−
):
Is the measured value same as the speci-
fied value?
0 V
Registration con-
nector circuit is
OK.
Repair harness,
and (or) connec-
tor.
SL-15
SECURITY AND LOCKS
KEYLESS ENTRY SYSTEM
6. CHECK DOOR SWITCH
Step
Value
Yes
No
1
CHECK DOOR SWITCH CIRCUIT.
Measure the voltage between the keyless
entry control module harness connector termi-
nal and chassis ground.
Connector & terminal
Front and rear door:
(B176) No. 3 (+) — Chassis ground (–):
Rear gate:
(B176) No. 4 (+) — Chassis ground (–):
Is the measured value same as the specified
value when opening either door or rear gate?
0 V
2
CHECK DOOR SWITCH CIRCUIT.
Measure the voltage between the keyless
entry control module harness connector termi-
nal and chassis ground.
Connector & terminal
Front and rear door:
(B176) No. 3 (+) — chassis ground (–):
Rear gate:
(B176) No. 4 (+) — chassis ground (–):
Is the measured value less than the specified
value when all doors and rear gate are closed?
10 V
The door switch is
OK.
3
CHECK DOOR SWITCH.
1) Disconnect the door switch harness con-
nector.
2) Measure the resistance between the door
switch terminals.
Terminal
Door switch No. 1 — No. 3:
Rear gate latch switch No. 1 — No. 2:
Does the measured value exceed the spec-
ified value when door switch is pressed?
1 M
Ω
Replace the door
switch.
4
CHECK DOOR SWITCH.
Measure the resistance between the door
switch terminals.
Terminal
Door switch No. 1 — No. 3:
Rear gate latch switch No. 1 — No. 2:
Is the measured value less than the specified
value when door switch is released?
1
Ω
Check the harness
for open circuits or
shorts between
the keyless entry
control module
and door switch.
Replace the door
switch.
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