Subaru B9 TRIBECA WX 2007 Manual page 283

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Step
1 CHECK CRUISE CONTROL COMMAND
SWITCH CIRCUIT.
1) Remove the driver's airbag module. <Ref. to
AB-14, REMOVAL, Driver's Airbag Module.>
2) Disconnect the harness connector of cruise
control command switch.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(ST3) No. 1 (+) — Chassis ground (–):
(ST3) No. 3 (+) — Chassis ground (–):
2 CHECK CRUISE CONTROL COMMAND
SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Remove the cruise control command
switch. <Ref. to CC-5, REMOVAL, Cruise Con-
trol Command Switch.>
3) Measure the resistance between harness
connector terminal and chassis ground.
Connector terminal
(ST3) No. 2 — Chassis ground:
3 Check Cruise Control Command Switch
Measure the resistance between switch termi-
nals when the cruise control command switch is
not being pressed.
Terminals
No. 2 — No. 3:
4 CHECK CANCEL SWITCH.
1) Turn the ignition switch to OFF.
2) Remove the cruise control command
switch. <Ref. to CC-5, REMOVAL, Cruise Con-
trol Command Switch.>
3) Measure the resistance between switch ter-
minals when the CANCEL switch is pressed.
Terminals
No. 2 — No. 3:
5 CHECK SET/COAST SWITCH.
Measure the resistance between switch termi-
nals when the SET/COAST switch is pressed.
Terminals
No. 2 — No. 3:
6 CHECK RESUME/ACCEL SWITCH CIRCUIT.
Measure the resistance between switch termi-
nals when the RESUME/ACCEL switch is
pressed.
Terminals
No. 2 — No. 3:
Check
Is the voltage 5 V or more?
Is the resistance less than 10
Ω?
Is the resistance approx. 4 kΩ? Go to step 4.
Is the resistance approx. less
than 1 Ω when the CANCEL
switch is pressed?
Is the resistance approx. 250 Ω
when SET/COAST switch is
pressed?
Is the resistance approx. 1,500
Ω when RESUME/ACCEL
switch is pressed?
CC(diag)-16
Yes No
Go to step 2. Check the harness
between cruise
control command
switch and ECM,
and the steering
roll connector for
open or short cir-
cuit, or for poor
contact.
Go to step 3. Check for open
between cruise
control command
switch and ECM
and chassis
ground, and check
the ECM.
Replace the cruise
control command
switch.
<Ref. to CC-5,
Cruise Control
Command
Switch.>
Go to step 5. Replace the cruise
control command
switch.
<Ref. to CC-5,
Cruise Control
Command
Switch.>
Go to step 6.
Replace the cruise
control command
switch.
<Ref. to CC-5,
Cruise Control
Command
Switch.>
Replace the ECM. Replace the cruise
<Ref. to control command
FU(H6DO)-33, switch.
Engine Control <Ref. to CC-5,
Module (ECM).> Cruise Control
Command
Switch.>