Subaru IMPREZA GD 2007 Series Manual page 3713

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Step
1 CHECK STOP LIGHT AND BRAKE SWITCH
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light and brake switch
harness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(B65) No. 2 (+) — Chassis ground (–):
2 CHECK STOP LIGHT AND BRAKE SWITCH
CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground.
Connector & terminal
(B65) No. 4 (+) — Chassis ground (–):
3 CHECK STOP LIGHT AND BRAKE SWITCH
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of ECM.
3) Measure the resistance between the ECM
harness connector terminal and stop light brake
switch harness connector terminal.
Connector & terminal
(B135) No. 28 — (B65) No. 3:
(B135) No. 20 — (B65) No. 1:
4 CHECK STOP LIGHT AND BRAKE SWITCH
CIRCUIT.
Remove and check the stop light and brake
switch. <Ref. to CC-6, Stop light and brake
Switch.>
Check
Is the voltage 10 V or more?
Is the voltage 10 V or more?
Is the resistance less than 10 Ω? Go to step 4.
Is the stop light and brake
switch OK?
CC(ETC)(diag)-22
Yes No
Go to step 2. • Check fuse No.
16 (in fuse & relay
box).
• Check for open
or short in the har-
ness between stop
light and brake
switch and fuse &
relay box.
Go to step 3. • Check fuse No.
18 (in fuse & relay
box).
• Check for open
or short in the har-
ness between stop
light and brake
switch and fuse &
relay box.
• Check the clutch
switch and circuit.
Repair the har-
ness.
Stop light switch Replace the stop
and brake switch light and brake
are OK. switch.