Subaru Legacy 2005 Service Manual page 4092

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Step
1 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch 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 SWITCH 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 SWITCH AND 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 switch
and brake switch harness connector terminal.
Connector & terminal
2.0 L turbo model, 3.0 L model, 2.5 L EC,
K4 and EK model:
(B136) No. 8 — (B65) No. 3:
(B136) No. 9 — (B65) No. 1:
2.0 L non-turbo model, 2.5 L KS, KA
model:
(B137) No. 13 — (B65) No. 3:
(B137) No. 12 — (B65) No. 1:
4 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH.
Remove and check the stop light switch and
brake switch. <Ref. to CC-6, Stop Light &
Brake Switch.>
Check
Is the voltage more than 10 V? Go to step 2.
−
):
Is the voltage more than 10 V? Go to step 3.
−
):
Is the resistance less than 10
Ω?
Are the stop light switch and
brake switch OK?
CC(diag)-20
Yes
• Check fuse No.
8 (in fuse & relay
box).
• Check the har-
ness for open or
short between
stop light/brake
switch and fuse &
relay box.
• Check fuse No.
4 (in fuse & relay
box).
• Check the har-
ness for open or
short between
stop light/brake
switch and fuse &
relay box.
Go to step 4. Repair the har-
ness.
Replace the ECM. Replace the stop
<Ref. to FU(H4SO light switch and
2.0)-34, Engine brake switch.
Control Module
(ECM).> <Ref. to
FU(H4SO 2.5)-37,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
No