05–554

DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003) 055ZL–04

DTC B1180/17 SHORT IN D SQUIB (2ND STEP) CIRCUIT

CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assy center, spiral cable sub–assy and horn button assy.
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
DTC B1180/17 is recorded when a short is detected in the D squib circuit (2nd step).
DTC No. DTC Detecting Condition Trouble Area

Short circuit between D2+ wire harness and D2– wire

Horn button assy (D squib, 2nd step)
harness of squib (2nd step)

Spiral cable sub–assy
B1180/17
D squib (2nd step) malfunction

Airbag sensor assy center

Spiral cable sub–assy malfunction

Instrument panel wire

Airbag sensor assy center malfunction

WIRING DIAGRAM

Airbag Sensor Assy Center

A16
D Squib (2nd step)

16
D+ Y–V
A13 D2+
4

17
D– Y–O
A13 D2–
3

Spiral Cable
Sub–Assy

H01451

2004 COROLLA (RM1037U)

Author: Date: 719

 05–555
DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

INSPECTION PROCEDURE
1 CHECK D SQUIB CIRCUIT(AIRBAG SENSOR ASSY CENTER – HORN BUTTON
ASSY)

(a) Disconnect the negative (–) terminal cable from the bat-
tery, and wait at least for 90 seconds.
Airbag (b) Disconnect the connectors between the airbag sensor
D Squib Spiral
Sensor assy center and the horn button assy.
Cable
Assy (c) Release the airbag activation prevention mechanism of
Sub–Assy
Center the connector (on the airbag sensor assy center side) be-
tween the airbag sensor assy center and the spiral cable
sub–assy (See page 05–424).
(d) For the black connector (on the spiral cable sub–assy
side ) between the horn button assy and the spiral cable
sub–assy, measure the resistance between D2+ and
Color: Black D2–.
OK:
H01001
C89244 H41475 Resistance: 1 MΩ or Higher
NG Go to step 4

OK

2 CHECK AIR BAG SENSOR ASSY CENTER

SST 09843–18040
(a) Connect the connector to the airbag sensor assy center.
Airbag (b) Connect the negative (–) terminal cable to the battery,
D Squib
Spiral
Sensor and wait at least for 2 seconds.
Cable (c) Turn the ignition switch to ON, and wait at least for 20 se-
Assy
Sub–Assy
Center conds.
(d) Clear the DTC stored in memory (See page 05–424).
(e) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(f) Turn the ignition switch to ON, and wait at least for 20 se-
DLC3 DTC B1180/17
conds.
(g) Check the DTC (See page 05–424).
OK:
CG Tc DTC B1180/17 is not output.
H01002
H10600 C89246 H42137 HINT:
Codes other than code B1180/17 may be output at this time, but
they are not relevant to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER

OK

2004 COROLLA (RM1037U)

Author: Date: 720

05–556
DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

3 CHECK D SQUIB

SST 09843–18040
(a) Turn the ignition switch to LOCK.
Airbag (b) Disconnect the negative (–) terminal cable from the bat-
D Squib
Spiral
Sensor tery, and wait at least for 90 seconds.
Cable
Assy (c) Connect the horn button assy connectors.
Sub–Assy
Center (d) Connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
(e) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
DLC3 DTC B1180/17 (f) Clear the DTC stored in memory (See page 05–424).
(g) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(h) Turn the ignition switch to ON, and wait at least for 20 se-
CG Tc conds.
H01003
H10600 C89246 H42138 (i) Check the DTC (See page 05–424).
OK:
DTC B1180/17 is not output.
HINT:
Codes other than code B1180/17 may be output at this time, but
they are not relevant to this check.
NG REPLACE HORN BUTTON ASSY

OK

USE SIMULATION METHOD TO CHECK

4 CHECK INSTRUMENT PANEL WIRE(AIRBAG SENSOR ASSY CENTER – SPIRAL

CABLE SUB–ASSY)

(a) Disconnect the connector of the instrument panel wire.

D Squib Airbag (b) Release the airbag activation prevention mechanism of
Spiral
Sensor the connector (on the airbag sensor assy center side) be-
Cable
Assy tween the airbag sensor assy center and the spiral cable
Sub–Assy
Center sub–assy (See page 05–424).
(c) For the connector (on the spiral cable sub–assy side) be-
tween the airbag sensor assy center and the spiral cable
sub–assy, measure the resistance between D2+ and
D2–.
OK:
Resistance: 1 MΩ or Higher
NG REPAIR OR REPLACE INSTRUMENT PANEL
WIRE(AIRBAG SENSOR ASSY CENTER – SPI-
H01004
H41424 H41478
RAL CABLE SUB–ASSY)

OK

2004 COROLLA (RM1037U)

Author: Date: 721

 05–557
DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

5 CHECK SPIRAL CABLE SUB–ASSY

(a) Release the airbag activation prevention mechanism of

the spiral cable sub–assy connector on the airbag sensor
assy center side (See page 05–424).
D Squib Airbag
Spiral (b) For the black connector (on the spiral cable sub–assy
Cable
Sensor
Assy
side) between the horn button assy and the spiral cable
Sub–Assy
Center sub–assy, measure the resistance between D2+ and
D2–.
OK:
Resistance: 1 MΩ or Higher

Color: Black
H01000
C89244 H41479 NG REPLACE SPIRAL CABLE SUB–ASSY

OK

USE SIMULATION METHOD TO CHECK

2004 COROLLA (RM1037U)

Author: Date: 722