Subaru Impreza 2002 Service Manual page 3720

Step
1 CHECK SET/COAST SWITCH CIRCUIT.
1)Turn the ignition switch to OFF.
2)Disconnect the cruise control module har-
ness connector.
3)Measure the voltage between harness con-
nector terminal and chassis ground when SET/
COAST switch is pressed and not pressed.
Connector & terminal
(B94) No. 10 (+) — Chassis ground ( − − − − ):
2 CHECK RESUME/ACCEL SWITCH CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground when
RESUME/ACCEL switch is pressed and not
pressed.
Connector & terminal
(B94) No. 9 (+) — Chassis ground ( − − − − ):
3 CHECK CANCEL SWITCH CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground when CAN-
CEL switch is pressed and not pressed.
Connector & terminal
(B94) No. 9 (+) — Chassis ground ( − − − − ):
(B94) No. 10 (+) — Chassis ground ( − − − − ):
4 CHECK POWER SUPPLY FOR COMMAND
SWITCH.
Check the horn operation.
5 CHECK CRUISE CONTROL COMMAND
SWITCH.
Remove and check the cruise control com-
mand switch. <Ref. to CC-6, Cruise Control
Command Switch.>
DIAGNOSTICS CHART WITH SYMPTOM
Is the voltage 0 V when SET/
COAST switch is not pressed?
Is the voltage more than 10 V
when SET/COAST switch is
pressed?
Is the voltage 0 V when
RESUME/ACCEL switch is not
pressed? Is the voltage more
than 10 V when RESUME/
ACCEL switch is pressed?
Is the voltage 0 V when CAN-
CEL switch is not pressed? Is
the voltage more than 10 V
when CANCEL switch is
pressed?
Does the horn sound?
Is the cruise control command
switch OK?
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Check
CC-21
Yes
Go to step 2. Go to step 4.
Go to step 3. Go to step 4.
Cruise control Go to step 4.
command switch
circuit is OK.
Go to step 5. • Check the fuse
No. 6 (in main fuse
box).
• Check the horn
relay. <Ref. to
COM-3, HORN
RELAY, INSPEC-
TION, Horn Sys-
tem.>
• Check the har-
ness for open or
short between
cruise control
command switch
and fuse & relay
box.
Check the harness Replace the cruise
between cruise control command
control command switch.
switch and cruise
control module.
No