Subaru IMPREZA GD 2007 Series Manual page 3711

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Step
1 CHECK CRUISE CONTROL MAIN SWITCH
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of ECM.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground when
cruise control main switch is pressed and not
pressed.
Connector & terminal
(B135) No. 12 (+) — Chassis ground (–):
2 CHECK SET/COAST SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of ECM.
3) Measure the voltage between the harness
connector terminal and chassis ground when
SET/COAST switch is pressed and not
pressed.
Connector & terminal
(B135) No. 24 (+) — Chassis ground (–):
3 CHECK RES/ACC SWITCH CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground when RES/
ACC switch is pressed and not pressed.
Connector & terminal
(B135) No. 13 (+) — Chassis ground (–):
4 CHECK CANCEL SWITCH CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground when CANCEL
switch is pressed and not pressed.
Connector & terminal
(B135) No. 13 (+) — Chassis ground (–):
(B135) No. 24 (+) — Chassis ground (–):
5 CHECK POWER SUPPLY FOR CRUISE
CONTROL COMMAND SWITCH.
Check the horn operation.
6 CHECK CRUISE CONTROL COMMAND
SWITCH.
Remove and check the cruise control command
switch. <Ref. to CC-5, Cruise Control Com-
mand Switch.>
Check
Is the voltage 0 V when cruise
control main switch is not
pressed? Is the voltage 10 V or
more when cruise control main
switch is pressed?
Is the voltage 0 V when SET/
COAST switch is not pressed?
Is the voltage 10 V or more
when SET/COAST switch is
pressed?
Is the voltage 0 V when RES/
ACC switch is not pressed? Is
the voltage 10 V or more when
RES/ACC switch is pressed?
Is the voltage 0 V when CAN-
CEL switch is not pressed? Is
the voltage 10 V or more when
CANCEL switch is pressed?
Does the horn sound?
Is the cruise control command
switch OK?
CC(ETC)(diag)-20
Yes No
Go to step 2. • Check fuse No.
18 (in fuse & relay
box).
• Check open or
shorted circuit of
harness between
cruise control com-
mand switch and
fuse & relay box.
If no malfunction is
found after check-
ing above, Go to
step 6.
Go to step 3. Go to step 5.
Go to step 4. Go to step 5.
Cruise control Go to step 5.
command switch
circuit is OK.
Go to step 6.
• 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 open or
shorted circuit of
harness between
cruise control com-
mand switch and
fuse & relay box.
Check the harness Replace the cruise
between cruise control command
control command switch.
switch and ECM.