check SUBARU LEGACY 1995 Service Repair Manual

7. Diagnostics Chart for Power Line
A: BASIC DIAGNOSTICS PROCEDURE
Drive at cruise speed.
Cruise speed can be set.
(Cruise control is available.)Cruise speed cannot be set.
(Cruise control is not available.)
Check cruise control main switch
light and circuit.
Check cruise control main
switch circuit.
OK
Not OK
Repair.
Check cruise control main
switch.
OK
Not OK
Repair.
Faulty cruise control module.



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6-2BODY ELECTRICAL SYSTEM
7. Diagnostics Chart for Power Line

B: CHECK INDICATOR AND CIRCUIT IN
CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:

Bulb failure or open harness of the indicator circuit in the
cruise control main switch.
TROUBLE SYMPTOM:

Cruise control can be set, normally indicator does not
come on. (When main switch is pressed.)
1. Check cruise control main switch.
OK
Not OK
Replace bulb.
2. Check circuit between cruise control module
and cruise control main switch indicator light.
OK
Not OK

Repair or replace wiring harness.

If no output from the cruise control module,
replace the cruise control module.
Failure of the cruise control module.
B6M0275


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6-2BODY ELECTRICAL SYSTEM
7. Diagnostics Chart for Power Line

B6M0180
1. CHECK CRUISE CONTROL MAIN SWITCH.
1) Remove cruise control main switch.
2) Measure resistance between cruise control main switch
terminals.
Terminals / Specified resistance:
No. 1—No. 6 / Approx. 50Ω
B6M0528A
B6M0531A
2. CHECK CIRCUIT BETWEEN CRUISE CONTROL
MODULE AND CRUISE CONTROL MAIN SWITCH
INDICATOR LIGHT.
1) Turn the ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Measure voltage between cruise control main switch
connector and the body.
Connector & terminal / Specified voltage:
(i19) No. 1—Body / 10 V, or more
4) Turn the ignition switch and cruise control main switch
to OFF.
5) Remove the connector from the cruise control main
switch.
6) Measure resistance of ground circuit between the
cruise control main switch connector and body.
Connector & terminal / Specified resistance:
(i19) No. 6—Body / 10Ω, max.
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6-2BODY ELECTRICAL SYSTEM
7. Diagnostics Chart for Power Line

C: CHECK CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:

Faulty cruise control main switch, or open harness.
TROUBLE SYMPTOM:

Cruise control main switch is not turned ON and cruise
control cannot be set.
NOTE:
When the main relay (built-in cruise control module)
operates, the main switch circuit is in normal condition.
The main relay operation can be checked by hearing the
operation sounds.
This operation sounds will be heard when ignition switch
and cruise control main switch is turned to ON.
1. Check fuse and power supply.
OK
Not OK
Melted fuse,repair the shorted part of the circuit.
,replace fuse.
2. Check cruise control main switch.
OK
Not OK
Open harness,repair faulty main switch.,
replace.
3. Check harness connector between cruise
control main switch and cruise control
module.
OK
Not OK
Repair or replace wiring harness.
Failure of the cruise control module.
B6M0275



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6-2BODY ELECTRICAL SYSTEM
7. Diagnostics Chart for Power Line

G6M0181
1. CHECK FUSE AND POWER SUPPLY.
1) Check fuse No. 18.
2) Turn ignition switch to ON.
3) Measure voltage between fuse box connector and body.
Connector & terminal / Specified voltage:
(B51) No. 4—Body / 10 V, or more
B6M0183B
2. CHECK CRUISE CONTROL MAIN SWITCH.
1) Turn ignition switch to OFF.
2) Remove cruise control main switch and disconnect con-
nector.
3) Turn ignition switch to ON.
4) Measure voltage between cruise control main switch
connector and body.
Connector & terminal / Specified voltage:
(i19) No. 3—Body / 10 V, or more
G6M0244
5) Measure resistance between cruise control main switch
terminals.
Terminals / Specified resistance:
No. 3—No. 5 / 10Ω, max. (ON)
1MΩ, min. (OFF)
B6M0184B
3. CHECK HARNESS CONNECTOR BETWEEN
CRUISE CONTROL MAIN SWITCH AND CRUISE
CONTROL MODULE.
1) Connect connector.
2) Turn ignition switch to ON.
3) Turn cruise control main switch to ON.
4) Measure voltage between each terminal of cruise con-
trol main switch or cruise control module and body.
Connector & terminal / Specified voltage:
(i19) No. 3—Body / 10 V, or more
(i19) No. 5—Body / 10 V, or more
(B94) No. 15—Body / 10 V, or more
NOTE:
Depress cruise control main switch with fingers while mea-
suring (i19) No. 5—Body.
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6-2BODY ELECTRICAL SYSTEM
7. Diagnostics Chart for Power Line

B: TROUBLE CODE 10
—NORMAL CONDITION—
DIAGNOSIS:

SET/COAST switch or disconnection of the wiring or
short circuit.

RESUME/ACCEL switch or disconnection of the wiring
or short circuit.
TROUBLE SYMPTOM:

Cruise control cannot be set, or it is cancelled immedi-
ately.

RESUME/ACCEL cannot be operated.
1. Check the signal using a select monitor.
Not OK
OK
Check for disconnection of the harnesses and
connectors.
2. Check the cruise control command switch.
OK
Not OK

Failure in the power source system.—Check the
horn relay circuit.

Failure in the switch or harnesses.—Replace.
Failure of the cruise control module.
B6M0532


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6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

LED No. Signal name Display
1 SET/COAST switch SE
2 RESUME/ACCEL switch RE
3 Stop light switch ST
4
Brake switch

Clutch switch (MT)BR
5 Inhibitor switch (AT) N
6——
7——
8——
9——
10——
SE RE ST BR N
—————
1
2345
678910
1. CHECK THE SIGNAL USING A SELECT MONITOR.
1) Turn ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Set select monitor in“FA 0”mode.
4) Check signals for proper operation.
(1) When pushing the SET switch:
LED No. 1 goes out—lights.
(2) When pushing the RESUME switch:
LED No. 2 goes out—lights.
B6M0533
B6M0527
2. CHECK THE CRUISE CONTROL COMMAND
SWITCH.
1) Disconnect connector from command switch.
2) Measure voltage between connector (S1) and body.
Connector & terminal / Specified voltage:
(S1) No. 1—Body / 10 V, or more
3) Check for harness short circuit between command
switch and body.
Terminals / Specified resistance:
No. 2—Body / 1 MΩ, min.
No. 3—Body / 1 MΩ, min.
B6M0534
4) Measure resistance between each terminal of switch
side connector to check the switch operation.
Terminals:
No. 1—No. 2 (SET/COAST SWITCH)
No. 1—No. 3 (RESUME/ACCEL SWITCH)
Specified resistance:
10Ω, max. (ON)
1MΩ, min. (OFF)
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6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

B6M0244
C: TROUBLE CODE 11
—BRAKE SWITCH, STOP LIGHT SWITCH,
CLUTCH SWITCH, INHIBITOR SWITCH—
DIAGNOSIS:

Failure or disconnection of the stop light switch and
brake switch.

Failure or disconnection of the inhibitor switch. (AT)

Failure or disconnection of the clutch switch. (MT)
TROUBLE SYMPTOM:

Cruise control cannot be set.
1. Check the signal using a select monitor.
Not OK
OK
Check for disconnection of the harnesses and
connectors.
2. Check brake switch and stop light switch.
OK
Not OK
Replace switch, repair wiring.
3. Check clutch switch. (MT model)
OK
Not OK
Replace switch, repair wiring.
4. Check inhibitor switch. (AT model)Not OK
Replace switch, repair wiring.
OK
Failure of the cruise control module.
B6M0283



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6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

LED No. Signal name Display
1 SET/COAST switch SE
2 RESUME/ACCEL switch RE
3 Stop light switch ST
4
Brake switch

Clutch switch (MT)BR
5 Inhibitor switch (AT) N
6——
7——
8——
9——
10——
SE RE ST BR N
—————
1
2345
678910
1. CHECK THE SIGNAL USING A SELECT MONITOR.
1) Turn ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Apply parking brake securely.
4) Set select monitor in“FA 0”mode.
5) Release the clutch pedal. (MT model)
6) Depress the brake pedal and check signals for proper
operation.
Stop light switch: LED No. 3 goes out—lights.
Brake switch : LED No. 4 goes out—lights.
7) Release the brake pedal.
8) Depress the clutch pedal and check signal for proper
operation. (MT model)
Clutch switch: LED No. 4 goes out—lights.
9) Set the selector lever from D to N position and check
signal for proper operation. (AT model)
Inhibitor switch: LED No. 5 goes out—lights.
G6M0183
2. CHECK BRAKE SWITCH AND STOP LIGHT
SWITCH.
1) Remove connector of stop and brake switch.
2) Check circuit between each terminal.
Pedal operationBrake switch between
No. 1—No. 4Stop light switch between
No. 2—No. 3
Depressing the
brake pedal.1MΩ,ormore 1Ω, or less
Without
depressing the
brake pedal.1Ω, or less 1 MΩ,ormore
G6M0184
3. CHECK CLUTCH SWITCH. (MT MODEL)
1) Disconnect connector from clutch switch.
2) Check continuity of the clutch switch.
Terminals / Specified resistance:
No. 1—No. 2 / 10Ω, max. (Without pedal
depressing.)
/1MΩ, min. (Pedal depressing.)
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6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code

B6M0242
4. CHECK INHIBITOR SWITCH. (AT MODEL)
1) Set the selector lever to N position.
2) Disconnect connector of inhibitor switch.
3) Check continuity of the inhibitor switch.
Terminals / Specified resistance:
No. 11—No. 12 / 10Ω, max.
(Selector lever is in P or N.)
/1MΩ, min.
(Selector lever is not in P or N.)
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6-2BODY ELECTRICAL SYSTEM
8. Diagnostics Chart with Trouble Code