05–548

DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003) 057UT–02

DTC B1158/16 FRONT AIRBAG SENSOR (LH)

MALFUNCTION

DTC B1159/16 FRONT AIRBAG SENSOR (LH)

MALFUNCTION

CIRCUIT DESCRIPTION
The airbag sensor front LH circuit consists of the airbag sensor assy center and airbag sensor front LH.
DTC B1158/B1159/16 is recorded when malfunction is detected in the airbag sensor front LH circuit.
DTC No. DTC Detecting Condition Trouble Area

Airbag sensor front LH

Airbag sensor assy center
B1158/B1159/16
Airbag sensor front LH malfunction

Instrument panel wire

Engine room main wire

WIRING DIAGRAM

A5
Airbag Sensor Front LH Airbag Sensor Assy Center

3 15
W–R W–R
+SL IA1 A13 +SL
2

4 26
BR BR
–SL IA1 A13 –SL
1

H02750

2004 COROLLA (RM1037U)

Author: Date: 713

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DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

INSPECTION PROCEDURE

1 CHECK FRONT AIRBAG SENSOR (LH) CIRCUIT (TO B+)(AIRBAG SENSOR ASSY
CENTER – AIRBAG SENSOR FRONT LH)

(a) Disconnect the negative (–) terminal cable from the bat-
Airbag tery, and wait at least for 90 seconds.
Airbag
Sensor (b) Disconnect the connectors between the airbag sensor
Sensor
Assy assy center and the airbag sensor front LH.
Front LH
Center (c) Connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
(d) Turn the ignition switch to ON.
(e) For the connector (on the airbag sensor assy center side)
between the airbag sensor front LH and the airbag sensor
+SL
assy center, measure the voltage between body ground
and each of +SL and –SL.
–SL OK:
Voltage: Below 1 V
H03355
C81408 H40069

NG Go to step 6

OK

2 CHECK FRONT AIRBAG SENSOR(LH) CIRCUIT(TO GROUND)(AIRBAG SENSOR

ASSY CENTER – AIRBAG SENSOR FRONT LH)

(a) Turn the ignition switch to LOCK.

Airbag (b) Disconnect the negative (–) terminal cable from the bat-
Airbag
Sensor tery, and wait at least for 90 seconds.
Sensor
Assy (c) For the connector (on the airbag sensor assy center side)
Front LH
Center between the airbag sensor front LH and the airbag sensor
assy center, measure the resistance between body
ground and each of +SL and –SL.
OK:
Resistance: 1 MΩ or Higher
+SL

–SL

H03355
C81408 H40069

NG Go to step 7

OK

2004 COROLLA (RM1037U)

Author: Date: 714

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DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

3 CHECK FRONT AIRBAG SENSOR (LH) CIRCUIT(OPEN)(AIRBAG SENSOR ASSY

CENTER – AIRBAG SENSOR FRONT LH)

(a) Using a service wire, connect +SL and –SL of the connec-
Airbag tor (on the airbag sensor front LH side) between the air-
Airbag
Sensor bag sensor assy center and the airbag sensor front LH.
Sensor
Front LH
Assy (b) For the connector (on the airbag sensor assy center side)
Center between the airbag sensor front LH and the airbag sensor
assy center, measure the resistance between +SL and
–SL.
+SL OK:
Resistance: Below 1 Ω

–SL
H03353
H03360 H08016 H41802
NG Go to step 8

OK

4 INSPECT AIR BAG SENSOR FRONT LH

(a) For the connector of the airbag sensor front LH, measure
the resistance between +SL and –SL.
OK:
Resistance: 820 Ω

+SL –SL
C54743 H40071

NG REPLACE AIR BAG SENSOR FRONT LH

OK

2004 COROLLA (RM1037U)

Author: Date: 715

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DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

5 CHECK AIR BAG SENSOR ASSY CENTER

SST 09843–18040
(a) Disconnect the negative (–) terminal cable from the bat-
Airbag tery, and wait at least for 90 seconds.
Airbag
Sensor (b) Connect the airbag sensor front LH connector and airbag
Sensor
Assy sensor assy center connector.
Front LH
Center (c) Connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
(d) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
DLC3 DTC B1158/B1159/16
(e) Clear the DTC stored in memory (See page 05–424).
(f) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(g) Turn the ignition switch to ON, and wait at least for 20 se-
CG Tc conds.
H02757 (h) Check the DTC (See page 05–424).
H10600 H01064 H40075

OK:
DTC B1158/B1159/16 is not output.
HINT:
Codes other than code B1158/B1159/16 may be output at this
time, but they are not relevant to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER

OK

USE SIMULATION METHOD TO CHECK

2004 COROLLA (RM1037U)

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DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

6 CHECK ENGINE ROOM MAIN WIRE HARNESS (TO B+)(CONECTOR – AIRBAG

SENSOR FRONT LH)

(a) Turn the ignition switch to LOCK.

(b) Disconnect the negative (–) terminal cable from the bat-
Airbag
Airbag tery, and wait at least for 90 seconds.
Sensor
Sensor
Assy (c) Disconnect the connector between the engine room main
Front LH wire and the instrument panel wire.
Center
(d) Connect the negative (–) terminal to the battery, and wait
Engine Room at least for 2 seconds.
Main Wire
(e) Turn the ignition switch to ON.
(f) For the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
–SL +SL center and the airbag sensor front LH, measure the volt-
age between body ground and each of +SL and –SL.
OK:
H03354
H40556 H40558 Voltage: Below 1 V
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE

OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

7 CHECK ENGINE ROOM MAIN WIRE HARNESS (TO GROUND)(CONNECTOR –

AIRBAG SENSOR FRONT LH)

(a) Disconnect the connectors between the engine room

main wire and the instrument panel wire.
Airbag
Airbag Sensor
(b) For the engine room main wire connector (on the airbag
Sensor
Assy sensor assy center side) between the airbag sensor assy
Front LH center and the airbag sensor front LH, measure the resis-
Center
tance between body ground and each of +SL and –SL.
Engine Room OK:
Main Wire
Resistance: 1 MΩ or Higher

–SL +SL

H03354
H40556 H40558
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE

OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

2004 COROLLA (RM1037U)

Author: Date: 717

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DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

8 CHECK ENGINE ROOM MAIN WIRE HARNESS(OPEN)(CONNECTOR – AIRBAG

SENSOR FRONT LH)

Engine Room
(a) Disconnect the connectors between the engine room
Main Wire main wire and the instrument panel wire.
Airbag (b) Using a service wire, connect +SL and –SL of the engine
Airbag
Sensor
Sensor room main wire connector (on the airbag sensor front LH
Assy
Front LH side) between the airbag sensor assy center and the air-
Center
bag sensor front LH.
(c) For the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
center and the airbag sensor front LH, measure the resis-
tance between +SL and –SL.
OK:
Resistance: Below 1 Ω
–SL +SL
H03352 NG REPAIR OR REPLACE ENGINE ROOM MAIN
H08016 H40556 H41801 WIRE

OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

2004 COROLLA (RM1037U)

Author: Date: 718