Subaru Legacy 2002 Service Manual page 3329

Cruise Control System (Diagnostics)
No.
1 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
1) Turn ignition switch OFF.
2) Disconnect stop light switch and brake
switch harness connector.
3) Turn ignition switch ON.
4) Turn cruise control main switch ON.
5) Measure voltage between harness connec-
tor terminal and chassis ground.
Connector & terminal
(B65) No. 2 (+) — Chassis ground (−):
2 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
Measure voltage between harness connector
terminal and chassis ground.
Connector & terminal
(B65) No. 1 (+) — Chassis ground (−):
3 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH CIRCUIT.
1) Turn cruise control main switch and ignition
switch OFF.
2) Disconnect cruise control module harness
connector.
3) Measure resistance between cruise control
module harness connector terminal and stop
light switch and brake switch harness connec-
tor terminal.
Connector & terminal
(B94) No. 20 (+) — (B65) No. 3 (−):
(B94) No. 16 (+) — (B65) No. 4 (−):
4 CHECK STOP LIGHT SWITCH AND BRAKE
SWITCH.
Remove and check stop light switch and
brake switch. <Ref. to CC-9, Stop and Brake
Switch.>
DIAGNOSTICS CHART WITH SYMPTOM
Step Check
Is the voltage more than 10
V?
Is the voltage more than 10
V?
Is the resistance less than
10 Ω?
Are stop light switch and
brake switch OK?
CC-22
Yes
¼ Check fuse No.
Go to step 2.
16 (in fuse & relay
box).
¼ Check harness
for open or short
between stop
light/brake switch
and fuse & relay
box.
¼ Check harness
Go to step 3.
for open or short
between stop
light/brake switch
and cruise control
module (AT).
¼ Check clutch
switch and the
circuit (MT).
Go to step 4. Repair harness.
Stop light switch Replace stop light
and brake switch switch and brake
circuit are OK. switch.
No