Subaru Legacy 2004 Service Manual page 3163

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch output in Subaru
Select Monitor.
2 CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in Subaru
Select Monitor.
3 CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal.
4 CHECK OPEN CIRCUIT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Depress the brake pedal.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.
Connector & terminal
(B310) No. 37 (+) — Chassis ground (
5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
6 CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
7 CHECK OTHER DTC DETECTION.
Check
Is OFF displayed on the dis-
play?
Is ON displayed on the dis-
play?
Does the stop light illuminate? Go to step 4.
Is the voltage 10 — 15 V?
#
):
nector between stop light
switch and VDCCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-90
Yes
Go to step 2. Go to step 3.
Go to step 5. Go to step 3.
Repair the stop
lights circuit.
Go to step 5. Repair the har-
ness between stop
light switch and
VDCCM&H/U con-
nector.
Go to step 6. Repair the con-
nector.
Replace the Go to step 7.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC.
No