Subaru Legacy 2004 Service Manual page 3042

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch signal in Subaru
Select Monitor.
2 CHECK OUTPUT OF STOP LIGHT SWITCH
USING 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 IN HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&H/
U.
3) Depress the brake pedal.
4) Measure the voltage between ABSCM&H/
U connector and chassis ground.
Connector & terminal
(B301) No. 20 (+) — Chassis ground (
5 CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-
6 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
7 CHECK ANY OTHER DTC ON DISPLAY.
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 ABSCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
ABS(diag)-75
ABS (DIAGNOSTICS)
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 harness
between stop light
switch and
ABSCM&H/U con-
nector.
Go to step 6. Repair the con-
nector.
Replace the Go to step 7.
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Inspect the DTC Temporary poor
using "List of Diag- contact occurs.
nostic Trouble
Code (DTC)".
<Ref. to
ABS(diag)-39, List
of Diagnostic Trou-
ble Code (DTC).>
No