Subaru Legacy III (2000-2003 year). Service manual — part 1000
CC-20
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SYMPTOM
E: CHECK STOP LIGHT SWITCH AND BRAKE SWITCH
TROUBLE SYMPTOM:
Cruise control cannot be set.
WIRING DIAGRAM:
CC-00080
CRUISE
CONTROL
MODULE
B65
BRAKE
SWITCH
STOP LIGHT
SWITCH
STOP LIGHT SWITCH
AND BRAKE SWITCH
CLUTCH
SWITCH (MT)
2
1
4
3
BATTERY
F/B NO. 16
SBF-1
SBF-2
1
2
MT
MT
AT
AT
B94
B107
16
11
20
B65
1 2
3 4
B107
1 2
B94
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
CC-21
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SYMPTOM
Step
Value
Yes
No
1
CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
1) Turn ignition switch OFF.
2) Disconnect stop light switch and brake
switch harness connector.
3) Turn ignition switch ON.
4) Turn cruise control main switch ON.
5) Measure voltage between harness connec-
tor terminal and chassis ground.
Connector & terminal
(B65) No. 2 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
• Check fuse No.
16 (in fuse & relay
box).
• Check harness
for open or short
between stop light/
brake switch and
fuse & relay box.
2
CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
Measure voltage between harness connector
terminal and chassis ground.
Connector & terminal
(B65) No. 1 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the specified
value?
10 V
• Check harness
for open or short
between stop light/
brake switch and
cruise control
module (AT).
• Check clutch
switch and the cir-
cuit (MT).
3
CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
1) Turn cruise control main switch and ignition
switch OFF.
2) Disconnect cruise control module harness
connector.
3) Measure resistance between cruise control
module harness connector terminal and
stop light switch and brake switch harness
connector terminal.
Connector & terminal
(B94) No. 20 — (B65) No. 3:
(B94) No. 16 — (B65) No. 4:
Is the measured value less than the speci-
fied value?
10
Ω
Repair harness.
4
CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH.
Remove and check stop light switch and brake
switch. <Ref. to CC-9, Stop and Brake
Switch.>
Are stop light switch and brake switch OK?
Stop light switch and brake
switch are OK.
Stop light switch
and brake switch
circuit are OK.
Replace stop light
switch and brake
switch.
CC-22
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SYMPTOM
F: CHECK CLUTCH SWITCH (MT)
TROUBLE SYMPTOM:
Cruise control cannot be set.
WIRING DIAGRAM:
CC-00080
CRUISE
CONTROL
MODULE
B65
BRAKE
SWITCH
STOP LIGHT
SWITCH
STOP LIGHT SWITCH
AND BRAKE SWITCH
CLUTCH
SWITCH (MT)
2
1
4
3
BATTERY
F/B NO. 16
SBF-1
SBF-2
1
2
MT
MT
AT
AT
B94
B107
16
11
20
B65
1 2
3 4
B107
1 2
B94
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
CC-23
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SYMPTOM
Step
Value
Yes
No
1
CHECK CLUTCH SWITCH CIRCUIT.
1) Turn ignition switch OFF.
2) Disconnect clutch switch harness connec-
tor.
3) Turn ignition switch ON.
4) Turn cruise control main switch ON.
5) Measure voltage between harness connec-
tor terminal and chassis ground.
Connector & terminal
(B107) No. 2 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Check harness for
open or short
between clutch
switch and cruise
control module.
2
CHECK CLUTCH SWITCH CIRCUIT.
1) Turn cruise control main switch and ignition
switch OFF.
2) Disconnect stop light switch and brake
switch harness connector.
3) Measure resistance between clutch switch
harness connector terminal and stop light
switch and brake switch harness connector
terminal.
Connector & terminal
(B107) No. 1 — (B65) No. 1:
Is the measured value less than the speci-
fied value?
10
Ω
Repair harness.
3
CHECK CLUTCH SWITCH.
Remove and check clutch switch. <Ref. to CC-
10, Clutch Switch.>
Is clutch switch OK?
Clutch switch is OK.
Clutch switch cir-
cuit is OK.
Replace clutch
switch.
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