Subaru Legacy III (2000-2003 year). Manual — part 998

CC-12

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SYMPTOM

6. Diagnostics Chart with Symptom

A: SYMPTOM CHART

Symptom

Repair area

Reference

1

Cruise control main switch is
not turned ON.

(1) Check power supply.

<Ref. to CC-14, CHECK POWER SUPPLY, Diagnostics
Chart with Symptom.>

(2) Check cruise control main
switch.

<Ref. to CC-16, CHECK CRUISE CONTROL MAIN
SWITCH, Diagnostics Chart with Symptom.>

2

Cruise control cannot be set.

(1) Check SET/COAST
switch.

<Ref. to CC-18, CHECK CRUISE CONTROL COM-
MAND SWITCH, Diagnostics Chart with Symptom.>

(2) Check stop light switch
and brake switch.

<Ref. to CC-20, CHECK STOP LIGHT SWITCH AND
BRAKE SWITCH, Diagnostics Chart with Symptom.>

(3) Check clutch switch (MT). <Ref. to CC-22, CHECK CLUTCH SWITCH (MT), Diag-

nostics Chart with Symptom.>

(4) Check inhibitor switch
(AT).

<Ref. to CC-24, CHECK INHIBITOR SWITCH (AT),
Diagnostics Chart with Symptom.>

(5) Check vehicle speed sen-
sor.

<Ref. to CC-28, DTC 22 VEHICLE SPEED SENSOR,
Diagnostics Chart with Trouble Code.>

(6) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(7) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

3

Vehicle speed is not held
within set speed

±

3 km/h (

±

2

MPH).

(1) Check vehicle speed sen-
sor.

<Ref. to CC-28, DTC 22 VEHICLE SPEED SENSOR,
Diagnostics Chart with Trouble Code.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

4

Vehicle speed does not
increase or does not return to
set speed after RESUME/
ACCEL switch has been
pressed.

(1) Check RESUME/ACCEL
switch.

<Ref. to CC-18, CHECK CRUISE CONTROL COM-
MAND SWITCH, Diagnostics Chart with Symptom.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

5

Vehicle speed does not
decrease after SET/COAST
switch has been pressed.

(1) Check SET/COAST
switch.

<Ref. to CC-18, CHECK CRUISE CONTROL COM-
MAND SWITCH, Diagnostics Chart with Symptom.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

6

Cruise control is not released
after CANCEL switch has
been pressed.

(1) Check CANCEL switch.

<Ref. to CC-18, CHECK CRUISE CONTROL COM-
MAND SWITCH, Diagnostics Chart with Symptom.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

7

Cruise control is not released
after brake pedal has been
depressed.

(1) Check stop light switch
and brake switch.

<Ref. to CC-20, CHECK STOP LIGHT SWITCH AND
BRAKE SWITCH, Diagnostics Chart with Symptom.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

CC-13

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SYMPTOM

8

Cruise control is not released
after clutch pedal has been
depressed (MT).

(1) Check clutch switch.

<Ref. to CC-22, CHECK CLUTCH SWITCH (MT), Diag-
nostics Chart with Symptom.>

(2) Check motor drive sys-
tem.

<Ref. to CC-32, DTC 35 AND 36 ACTUATOR MOTOR,
Diagnostics Chart with Trouble Code.>

(3) Check motor clutch drive
system.

<Ref. to CC-34, DTC 37 ACTUATOR MOTOR CLUTCH,
Diagnostics Chart with Trouble Code.>

Symptom

Repair area

Reference

CC-14

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SYMPTOM

B: CHECK POWER SUPPLY

TROUBLE SYMPTOM:
Cruise control cannot be set, and indicator does not come on. (When main switch is pressed.)
WIRING DIAGRAM:

M2

B2

A2

1

11

15

12

6

i1

B36

CRUISE CONTROL MODULE

B94

BATTERY

IGNITION

SWITCH

6

1

5

3

NO. 18

SBF-4

i19

SMJ

CRUISE CONTROL

MAIN SWITCH

i19

1
3 4 5 6

2

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

B36

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

3

1

11

9

i60

i61

CC-00096

B

A

B

A

B

A

B

A

B

A

B

A

B

A

B

B

A

: LHD H6 AND LHD H4 FOR
EUROPE

: LHD H4 EXCEPT FOR EUROPE
AND RHD

A

B

1 2 3
9 10

4

11 12 13 14 15 16

5 6 7

17 18

8

i60

CC-15

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SYMPTOM

Step

Value

Yes

No

1

CHECK POWER SUPPLY.
1) Turn ignition switch OFF.
2) Disconnect cruise control module harness

connector.

3) Turn ignition switch ON.
4) Measure voltage between harness connec-

tor terminal and chassis ground.

Connector & terminal

(B94) No. 12 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

• Check fuse No.
18 (in fuse & relay
box).
• Check harness
for open or short
between cruise
control module
and fuse & relay
box.

2

CHECK GROUND CIRCUIT.
1) Turn ignition switch OFF.
2) Measure resistance between harness con-

nector terminal and chassis ground.

Connector & terminal

(B94) No. 6 — Chassis ground:

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

10

Ω

Power supply and
ground circuit are
OK.

Repair harness.