sensor SUBARU LEGACY 1997 Service Repair Manual

B: TROUBLE CODE 03
DIAGNOSIS:
Front sensor harness circuit is open.
Front sensor unit circuit is open.
1. Front sensor (LH and RH) inspectionIdentify faulty sensor and replace front sensor.
CAUTION:
Before performing the diagnostics on airbag system,
turn ignition switch“OFF”, disconnect battery ground
terminal and then wait at least 20 seconds.
G5M0558
1. FRONT SENSOR (LH AND RH) INSPECTION
1) Disconnect connectors (AB4) and (AB5) from airbag
control module.
2) Connect connectors (AB4) and (AB5) to test harness
B2 connector (8B).
3) Measure resistance between connector (5B) terminal.
(5B) Terminal / Specified resistance:
(RH: AB4): No. 17—No. 18 / 1.4—1.6 kΩ
(LH: AB5): No. 15—No. 16 / 1.4—1.6 kΩ
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5-5SUPPLEMENTAL RESTRAINT SYSTEM
5. Diagnostics Chart with Trouble Code

J: TROUBLE CODE 23
DIAGNOSIS:
Airbag main harness is shorted to power supply.
Front sensor harness is shorted to power supply.
Airbag module harness (Driver or passenger) is dam-
aged.
Roll connector is shorted to power supply.
Airbag control module is faulty.
1. Front sensor inspection
O.K.
Not O.K.
Replace front sensor.
2. Airbag main harness inspection
O.K.
Not O.K.
Replace airbag main harness.
Replace airbag control module.
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground ter-
minal and then wait at least 20 seconds.
After 20 seconds elapse, remove instrument panel
lower cover, and disconnect (AB3) and (AB8), (AB9)
and (AB10).


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5-5SUPPLEMENTAL RESTRAINT SYSTEM
5. Diagnostics Chart with Trouble Code

G5M0558
1. FRONT SENSOR INSPECTION
1) Disconnect connectors (AB4) and (AB5) from airbag
control module.
2) Connect connectors (AB4) and (AB5) to test harness
B2 connector (8B).
3) Measure resistance between test harness B2 connec-
tor (5B) terminal.
(5B) Terminal / Specified resistance:
(RH: AB4): No. 17—No. 18 / 1.4—1.6 kΩ
(LH: AB5): No. 15—No. 16 / 1.4—1.6 kΩ
G5M0559
2. AIRBAG MAIN HARNESS INSPECTION
1) Disconnect connector (AB6) from airbag control module
, and connect it to test harness B2
connector (8B).
2) Connect battery ground cable and turn ignition switch
“ON”(engine off).
3) Measure voltage across each test harness B2 connec-
tor (5B) terminal and body.
(5B) Terminal / Specified voltage:
No. 1—Body/1V,orless
No. 6—Body/1V,orless
No. 7—Body/1V,orless
No. 14—Body/1V,orless
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5-5SUPPLEMENTAL RESTRAINT SYSTEM
5. Diagnostics Chart with Trouble Code

1. SELECTION OF CHECK PARTS
1) Conduct on-board diagnostic and call up trouble codes
stored in memory.
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 5-5:
02Front sensor (RH, LH)
Airbag main harness
Airbag module (Driver/Passenger)
Roll connector
Airbag control moduleW4A0
W5A0
W3A1—W3A2
W7A0
W6A0
03Front sensor (RH, LH)
Airbag control moduleW4A0
W6A0
04Airbag module (Passenger)
Airbag main harness
Airbag control moduleW3A2
W5A0
W6A0
11Fuse No. 8
Airbag main harness
Airbag control module
Body harnessT5D3
W5A0
W6A0
—
12Roll connector
Airbag module (Driver)
Airbag main harness
Airbag control moduleW7A0
W3A1
W5A0
W6A0
13Airbag module (Driver)
Roll connector
Airbag main harness
Airbag control moduleW3A1
W7A0
W5A0
W6A0
21Airbag control module W6A0
22Airbag module (Passenger)
Airbag main harness
Airbag control moduleW3A2
W5A0
W6A0
23Airbag main harness
Roll connector
Airbag module (Driver/Passenger)
Front sensor (RH, LH)
Airbag control moduleW5A0
W7A0
W3A1—W3A2
W4A0
W6A0
24Airbag module (Driver)
Roll connector
Airbag main harness
Airbag control moduleW3A1
W7A0
W5A0
W6A0
32Airbag module (Passenger)
Roll connector
Airbag main harness
Airbag control moduleW3A2
W7A0
W5A0
W6A0
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5-5SUPPLEMENTAL RESTRAINT SYSTEM
5. Diagnostics Chart with Trouble Code

2. AIRBAG COMPONENT PARTS APPEARANCE
INSPECTION
Conduct appearance inspection on parts selected.
NOTE:
Also check connector terminals, wiring harness, case, etc.
for damage.
3. 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 and
front sensor at the same time as erroneous operation
may result.
G5M0461
4. SHOWERING INSPECTION TO BODY
1) Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag components.
2) Check passenger compartment for traces of leaking.
NOTE:
Also check wiring harnesses as water may leak along them
and get airbag component parts wet.
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5-5SUPPLEMENTAL RESTRAINT SYSTEM
5. Diagnostics Chart with Trouble Code

1. Electrical Components Location
1. LHD MODEL
B5M0402A
Connector No. (AB1) (AB2) (AB3) (AB6) (AB7) (AB8) (AB9) (AB10)
Pole 7 3 3 12 3 3 3 3
Color Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow
Male/Female Male Female Female Female Male Male Male Female
2
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
1. Electrical Components Location

2. RHD MODEL
B5M0435A
Connector No. (AB1) (AB2) (AB3) (AB6) (AB7) (AB8) (AB9) (AB10)
Pole 7 3 3 12 3 3 3 3
Color Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow
Male/Female Male Female Female Female Male Male Male Female
3
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
1. Electrical Components Location

2. Schematic
B5M0464A
4
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
2. Schematic

3. Tools for Diagnostics
CAUTION:
Be sure to use specified test harness A, B or C when
measuring voltage, resistance, etc. of AIRBAG system
component parts.
A: TEST HARNESS A
B5M0112A
5
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
3. Tools for Diagnostics

B: TEST HARNESS B2
G5M0593
6
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
3. Tools for Diagnostics