Subaru 2009 IMPREZA Service Manual page 3302

Step
1 CHECK STOP LIGHT & BRAKE SWITCH
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light & brake switch har-
ness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
5 door model:
(B65) No. 1 (+) — Chassis ground (–):
4 door model:
(B65) No. 3 (+) — Chassis ground (–):
2 CHECK STOP LIGHT & BRAKE SWITCH
CIRCUIT.
Measure the voltage between harness connec-
tor terminal and chassis ground.
Connector & terminal
5 door model:
(B65) No. 3 (+) — Chassis ground (–):
4 door model:
(B65) No. 1 (+) — Chassis ground (–):
3 CHECK STOP LIGHT & BRAKE SWITCH
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of ECM.
3) Measure the resistance between ECM har-
ness connector terminal and stop light & brake
switch harness connector terminal.
Connector & terminal
5 door model:
(B135) No. 20 — (B65) No. 4:
(B135) No. 28 — (B65) No. 2:
4 door model:
(B135) No. 20 — (B65) No. 2:
(B135) No. 28 — (B65) No. 4:
4 CHECK STOP LIGHT & BRAKE SWITCH.
Check the stop light & brake switch. <Ref. to
CC-7, Stop Light & Brake Switch.>
Diagnostic Procedure with Cancel Code
Is the voltage 10 V or more?
Is the voltage 10 V or more?
Is the resistance less than 10 ? Go to step 4.
Is the stop light & brake switch
OK?
CC(diag)-17
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Check Yes
Go to step 2.
Go to step 3.
Replace the ECM.
<Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC)-52,
Engine Control
Module (ECM).>
No
• Check fuse No. 8
(in fuse & relay
box).
• Check for open
or short in the har-
ness between stop
light & brake switch
and fuse & relay
box.
• Check fuse No. 4
(in fuse & relay
box).
• Check for open
or short in the har-
ness between stop
light & brake switch
and fuse & relay
box.
Repair the har-
ness.
Replace the stop
light & brake
switch.