1999 SUBARU FORESTER Service Repair Manual

3H51 : CHECK POWER SUPPLY.
1) Turn ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Set select monitor in ªCurrent Data Display &
Saveº mode.
4) Check signals for proper operation.
(1) When pushing the SET/COAST switch:
The SET/COAST switch shown on the display
turns from ªOFFº to ªONº.
(2) When pushing the RESUME/ACCEL
switch:
The RESUME/ACCEL switch shown on the dis-
play turns from ªOFFº to ªONº.
5) Turn ignition switch to OFF.
6) Disconnect connector from cruise control com-
mand switch.
7) Turn ignition switch to ON.
8) Measure voltage between cruise control com-
mand switch connector and chassis ground.
Terminals
No. 1 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V?
: Go to step3H52.
: Repair or replace wiring harness
between fuse & relay box and cruise
control command switch. [W12B3].>3H52 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
1) Turn ignition switch to OFF.
2) Connect connector of cruise control command
switch.
3) Turn ignition switch to ON.
4) Measure voltage between cruise control com-
mand switch connector and chassis ground.
Terminals
No. 2 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
SET/COAST switch is ON.)
: Go to step3H53.
: Replace cruise control command
switch.
3H53 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 3 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
RESUME/ACCEL switch is ON.)
: Go to step3H54.
: Replace cruise control command
switch.
43
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

3H54 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 2 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
CANCEL switch is ON.)
: Go to step3H55.
: Replace cruise control command
switch.
3H55 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 3 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
CANCEL switch is ON.)
: Go to step3H56.
: Replace cruise control command
switch. 3H56 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connector from cruise control com-
mand switch.
3) Measure resistance between terminals of
cruise control command switch connector (switch
side) to check the switch operation.
Terminals
No. 1 Ð No. 2:
S6M0125
:Is resistance less than 10W? (When
SET/COAST switch is ON.)
: Go to step3H57.
: Replace cruise control command
switch.
44
6-2[T3H5]DIAGNOSTICS
3. Cruise Control System

3H57 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 2:
S6M0125
:Is resistance more than 1 MW? (When
SET/COAST switch is OFF.)
: Go to step3H58.
: Replace cruise control command
switch.
3H58 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 3:
S6M0125
:Is resistance less than 10W? (When
RESUME/ACCEL switch is ON.)
: Go to step3H59.
: Replace cruise control command
switch. 3H59 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 3:
S6M0125
:Is resistance more than 1 MW? (When
RESUME/ACCEL switch is OFF.)
: Go to step3H510.
: Replace cruise control command
switch.
3H510 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL
COMMAND SWITCH AND CRUISE
CONTROL MODULE.
1) Disconnect connector from cruise control mod-
ule.
2) Measure resistance of harness connector
between cruise control command switch and
cruise control module.
Connector & terminal
No. 2 (command switch) Ð (B94) No. 6:
S6M0126A
:Is resistance less than 10W?
: Go to step3H511.
: Repair or replace wiring harness.
45
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

3H511 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL
COMMAND SWITCH AND CRUISE
CONTROL MODULE.
Measure resistance of harness connector between
cruise control command switch and cruise control
module.
Connector & terminal
No. 3 (command switch) Ð (B94) No. 7:
S6M0127A
:Is resistance less than 10W?
: Replace cruise control module. 6-2 [W12B4].>
: Repair or replace wiring harness.
46
6-2[T3H5]DIAGNOSTICS
3. Cruise Control System

MEMO:
47
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

6. DIAGNOSTIC CODE 21, 22 AND 23 (VACUUM VALVE, VENT 2 VALVE, VENT 1 VALVE)
DIAGNOSIS:
IOpen or poor contact of vacuum valve, vent 2 valve and vent 1 valve.
TROUBLE SYMPTOM:
ICruise control cannot be set. (Cancels immediately.)
WIRING DIAGRAM:
S6M0128
48
6-2[T3H6]DIAGNOSTICS
3. Cruise Control System

3H61 : MEASURE RESISTANCE OF
VACUUM VALVE, VENT 2 VALVE
AND VENT 1 VALVE.
1) Disconnect connector from actuator.
2) Measure resistance of vacuum valve, vent 2
valve and vent 1 valve.
Terminals
No. 2 Ð No. 3:
S6M0104
:Is resistance less than 22W?
: Go to step3H62.
: Replace actuator. [W12B1].>
3H62 : MEASURE RESISTANCE OF
VACUUM VALVE, VENT 2 VALVE
AND VENT 1 VALVE.
Measure resistance of vacuum valve, vent 2 valve
and vent 1 valve.
Terminals
No. 2 Ð No. 1:
S6M0104
:Is resistance less than 55W?
: Go to step3H63.
: Replace actuator. [W12B1].>3H63 : MEASURE RESISTANCE OF
VACUUM VALVE, VENT 2 VALVE
AND VENT 1 VALVE.
Measure resistance of vacuum valve, vent 2 valve
and vent 1 valve.
Terminals
No. 2 Ð No. 4:
S6M0104
:Is resistance less than 55W?
: Go to step3H64.
: Replace actuator. [W12B1].>
49
[T3H6]6-2DIAGNOSTICS
3. Cruise Control System

3H64 : PERFORM A CIRCUIT TEST IN HAR-
NESS BETWEEN ACTUATOR
(VACUUM VALVE, VENT 2 VALVE
AND VENT 1 VALVE) AND CRUISE
CONTROL MODULE.
1) Disconnect connector from cruise control mod-
ule.
2) Measure resistance of harness connector
between cruise control module, vacuum valve,
vent 2 valve and vent 1 valve.
Connector & terminal
(B7) No. 1 Ð (B94) No. 1:
S6M0130A
:Is resistance less than 10W?
: Go to step3H65.
: Repair or replace wiring harness
between actuator [W12B1].> and cruise control module
.3H65 : PERFORM A CIRCUIT TEST IN HAR-
NESS BETWEEN ACTUATOR
(VACUUM VALVE, VENT 2 VALVE
AND VENT 1 VALVE) AND CRUISE
CONTROL MODULE.
Measure resistance of harness connector between
cruise control module, vacuum valve, vent 2 valve
and vent 1 valve.
Connector & terminal
(B7) No. 2 Ð (B94) No. 8:
S6M0131A
:Is resistance less than 10W?
: Go to step3H66.
: Repair or replace wiring harness
between actuator [W12B1].> and cruise control module
.
50
6-2[T3H6]DIAGNOSTICS
3. Cruise Control System