SUBARU LEGACY 1997 Service Repair Manual

P: WARNING LIGHT INDICATES TROUBLE
CODE, THEN NORMAL CODE.
—FLASHING TROUBLE CODE.—
DIAGNOSIS:
Airbag system component parts are faulty.
1. Airbag component parts appearance
inspection
2. Airbag component parts vibration inspection
3. Showering inspection to body
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground
cable, and then wait at least 20 seconds.


38
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

1. AIRBAG COMPONENT PARTS APPEARANCE
INSPECTION
1) Conduct on-board diagnostic and call up trouble codes
stored in memory. <Ref. to 5-5b [T4B0].>
2) Select trouble code required to check airbag compo-
nent parts from those listed in table and reproduce symp-
tom.
Trouble codes Check parts Refer to 5-5b:
04Airbag module (Passenger)
Airbag main harness
Airbag control moduleW3A2
W4A0
W5A0
11Fuse No. 8
Airbag main harness
Airbag control module
Body harnessT5D3
W4A0
W5A0
—
12Roll connector
Airbag module (Driver)
Airbag main harness
Airbag control moduleW6A0
W3A1
W4A0
W5A0
13Airbag module (Driver)
Roll connector
Airbag main harness
Airbag control moduleW3A1
W6A0
W4A0
W5A0
21Airbag control module W5A0
22Airbag module (Passenger)
Airbag main harness
Airbag control moduleW3A2
W4A0
W5A0
33Airbag control module W5A0
34Airbag main harness
Airbag module (Passenger)
Airbag control moduleW4A0
W3A2
W5A0
41Airbag module (Driver)
Roll connector
Airbag main harness
Airbag control moduleW3A1
W6A0
W4A0
W5A0
42Airbag module (Passenger)
Airbag main harness
Airbag control moduleW3A2
W4A0
W5A0
43Airbag module (Driver)
Roll connector
Airbag main harness
Airbag control moduleW3A1
W6A0
W4A0
W5A0
39
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

3) Conduct appearance inspection on parts selected.
: Is there anything unusual about the appear-
ance of airbag component parts?
: Replace faulty airbag component parts.
: Go to step2.
NOTE:
Also check connector terminals, wiring harness, case, etc.
for damage.
2. AIRBAG COMPONENT PARTS VIBRATION
INSPECTION
1) Gently shake check parts (to determine faults.).
2) To check airbag module or roll connector, turn and tilt
steering wheel.
CAUTION:
Do not shake or vibrate airbag control module.
: Does the component malfunction again
when shaking?
: Replace faulty airbag component parts.
: Go to step3.
G5M0461
3. SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag components.
: Does water leak into the passenger com-
partment when showering vehicle?
: Replace faulty airbag component parts.
: Clear memory.
NOTE:
Also check wiring harnesses as water may leak along them
and get airbag component parts wet.
40
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

Q: WARNING LIGHT INDICATES TROUBLE
CODE, THEN NORMAL CODE.
—FLASHING NORMAL CODE.—
DIAGNOSIS:
Airbag connector is faulty.
Fuse No. 16 is blown.
Airbag main harness is faulty.
Airbag control module is faulty.
Body harness is faulty.
1. Airbag connector appearance inspection
2. Airbag connector vibration inspection
3. Showering inspection to body
4. Fuse No. 16, airbag main harness, airbag
control module, body harness appearance
inspection
5. Fuse No. 16, airbag main harness, body
harness vibration inspection
6. Showering inspection to body
7. Warning light illumination check
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground
cable, and then wait at least 20 seconds.
1. AIRBAG CONNECTOR APPEARANCE INSPECTION
Conduct appearance inspection on airbag connectors
(AB2) through (AB8). <Ref. to 5-5b [T100].>
: Is there anything unusual about the appear-
ance of connectors (AB2) through (AB8)?
: Replace faulty airbag component parts.
: Go to step2.
NOTE:
Check terminals, case and wiring harnesses for damage.






41
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

2. AIRBAG CONNECTOR VIBRATION INSPECTION
Conduct vibration inspection on airbag connectors (AB2)
through (AB8). <Ref. to 5-5b [T100].>
: Do the connectors (AB2) through (AB8) mal-
function again when shaking?
: Replace faulty airbag component parts.
: Go to step3.
NOTE:
Gently shake each airbag connector.
G5M0461
3. SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag components.
: Does water leak into the passenger com-
partment when showering vehicle?
: Replace faulty airbag component parts.
: Go to step4.
NOTE:
If leaks are noted, also check wiring harnesses as water
may leak along them and wet airbag connectors.
4. FUSE No. 16, AIRBAG MAIN HARNESS, AIRBAG
CONTROL MODULE, BODY HARNESS APPEARANCE
INSPECTION
Conduct appearance inspection on fuse No. 16 <Ref. to
5-5b [T5H3].>, airbag main harness <Ref. to 5-5b
[W4A0].>, airbag control module <Ref. to 5-5b [W5A0].>
and body harness.
: Is there anything unusual about the appear-
ance of fuse No. 16, airbag main harness,
airbag control module or body harness?
: Replace faulty airbag component parts.
: Go to step5.
NOTE:
Also check connectors, terminals, wiring harness and case
for damage.
42
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

5. FUSE No. 16, AIRBAG MAIN HARNESS, BODY
HARNESS VIBRATION INSPECTION
Conduct vibration inspection on fuse No. 16, airbag main
harness and body harness.
CAUTION:
Do not shake or vibrate airbag control module.
: Do fuse No. 16, airbag main harness or body
harness malfunction again when shaking?
: Replace faulty airbag component parts.
: Go to step6.
NOTE:
Gently shake each part.
G5M0461
6. SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on each part.
: Does water leak into the passenger com-
partment when showering vehicle?
: Replace faulty airbag component parts.
: Go to step7.
NOTE:
If leaks are noted, check wiring harnesses as water may
leak along them and get parts wet.
7. WARNING LIGHT ILLUMINATION CHECK
Turn ignition switch“ON”(engine off) and observe airbag
warning light.
: Does the airbag warning light comes on for
about 7 seconds, then go out and stay out?
: Clear memory.
:Goto“DIAGNOSTICS PROCEDURE”.
<Ref. to 5-5b [T4E0].>
43
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the cruise
control command switch.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuits.

Be careful not to damage Airbag system wiring har-
ness when servicing the cruise control command
switch.
B6M0171A
B6M0241A
2. Pre-inspection
1. CRUISE CONTROL CABLE
1) Cable installation
(1) Ensure that cruise control cable is attached to the left
of accelerator cable (on accelerator pedal side).
(2) Ensure that accelerator cable throttle cam does not
move when cruise control throttle cam is moved by hand.
(3) Ensure that throttle cam moves smoothly.
2) Cable free play
(1) Ensure that throttle cam-to-lever clearance is within
specifications.
Standard value: 1
0
1mm (0.040
0.04in)
NOTE:
If clearance is not within specifications, adjust cable at its
outer end.
(2) Ensure that cap is positioned in groove.
2
6-2BODY ELECTRICAL SYSTEM
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the cruise
control command switch.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuits.

Be careful not to damage Airbag system wiring har-
ness when servicing the cruise control command
switch.
B6M0171A
B6M0241A
2. Pre-inspection
1. CRUISE CONTROL CABLE
1) Cable installation
(1) Ensure that cruise control cable is attached to the left
of accelerator cable (on accelerator pedal side).
(2) Ensure that accelerator cable throttle cam does not
move when cruise control throttle cam is moved by hand.
(3) Ensure that throttle cam moves smoothly.
2) Cable free play
(1) Ensure that throttle cam-to-lever clearance is within
specifications.
Standard value: 1
0
1mm (0.040
0.04in)
NOTE:
If clearance is not within specifications, adjust cable at its
outer end.
(2) Ensure that cap is positioned in groove.
2
6-2BODY ELECTRICAL SYSTEM
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection

B6M0269A
2. VACUUM HOSE AND PIPE
Check vacuum hose and pipe (which connects actuator
and vacuum pump) for disconnection or cracks.
B6M0270A
3. ACTUATOR
1) Disconnect vacuum hose from actuator.
B6M0174
2) Connect vacuum pump as shown in figure.
3) Make sure that cruise control cable moves smoothly
and quickly when a vacuum pressure of 40.0 kPa (300
mmHg, 11.81 inHg) is applied to actuator.
Stroke: 35 mm (1.38 in)
4) When vacuum pressure is released from condition 3)
above, make sure the cable returns to its original position
smoothly and quickly.
5) After inspection, disconnect vacuum pump and connect
vacuum hose.
4. POWER SUPPLY
1) Measure battery voltage and specific gravity of electro-
lyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
2) Check the condition of the main and other fuses, and
harnesses and connectors. Also check for proper ground-
ing.
3
6-2BODY ELECTRICAL SYSTEM
2. Pre-inspection

B6M0271
5. VACUUM PUMP AND VALVE
1) Measure resistance of vacuum pump and valve.
(1) Disconnect connector from vacuum pump and valve.
(2) Measure resistance between each terminal of
vacuum pump and valve.
Terminals / Specified resistance:
No. 2—No. 3 / 100Ωor less (Vacuum pump
motor)
No. 2—No. 1 / 69Ω(Air valve)
No. 2—No. 4 / 69Ω(Release valve)
B6M0272
2) Check for leakage and sticking of vacuum valve.
(1) Disconnect connector from vacuum pump and valve.
(2) Make sure that cruise control cable moves smoothly
when connecting + (positive) battery cable to terminal
No. 2 and (negative) battery cable to terminals No. 1,
3 and 4 of vacuum pump and valve connector.
Stroke: 35 mm (1.38 in)
Movement time: Within 3 seconds
(3) When the battery cable is disconnected from condi-
tion (2) above, make sure the cable returns to its origi-
nal position smoothly.
Movement time: Within 1.5 seconds
(4) Connect battery to each terminal and check cable
movement.
Terminal No. Battery
Cruise control
cable operation
1234

———————

Pull 


Hold 

Release

4
6-2BODY ELECTRICAL SYSTEM
2. Pre-inspection