05–576

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

DTC B1187/55 SHORT IN P SQUIB (2ND STEP) CIRCUIT

CIRCUIT DESCRIPTION
The P squib (2nd step) circuit consists of the airbag sensor assy center and instrument panel passenger
airbag assy.
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
DTC B1187/55 is recorded when ground short is detected in the P squib (2nd step) circuit.
DTC No. DTC Detecting Condition Trouble Area

Short circuit in P squib (2nd step) wire harness (to ground)
Instrument panel passenger airbag assy (P squib, 2nd step)
B1187/55
P squib malfunction
Airbag sensor assy center

Airbag sensor assy center malfunction
Instrument panel wire

WIRING DIAGRAM
See page 05–570.

INSPECTION PROCEDURE
1 CHECK P SQUIB CIRCUIT(AIRBAG SENSOR ASSY CENTER – INSTRUMENT
PANEL PASSENGER AIRBAG ASSY)

(a) Disconnect the negative (–) terminal cable from the bat-
tery, and wait at least for 90 seconds.
Airbag (b) Disconnect the connector between the airbag sensor
P Squib
Sensor assy center and the instrument panel passenger airbag
Assy assy.
Center (c) For the connector (on the instrument panel passenger air-
bag assy side) between the airbag sensor assy center
and the instrument panel passenger airbag assy, mea-
sure the resistance between P2+ and body ground.
OK:
P2– Resistance: 1 MΩ or Higher

R14286 P2+
H41424 H41932
NG REPAIR OR REPLACE INSTRUMENT PANEL
WIRE

OK

2004 COROLLA (RM1037U)

Author: Date: 741

2 CHECK AIR BAG SENSOR ASSY CENTER

SST 09843–18040
(a) Connect the connector to the airbag sensor assy center.
(b) Using a service wire, connect P2+ and P2– of the connec-
Airbag
P Squib tor (on the instrument panel passenger airbag assy side)
Sensor
between the airbag sensor assy center and the instru-
Assy
ment panel passenger airbag assy.
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.
(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.
DLC3 DTC B1187/55 (g) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(h) Check the DTC (See page 05–424).
OK:
CG Tc DTC B1187/55 is not output.
H01023
HINT:
H16853
H10600 H16838 H41983 Codes other than code B1187/55 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: 742

3 CHECK P SQUIB

SST 09843–18040
(a) Turn the ignition switch to LOCK.
Airbag (b) Disconnect the negative (–) terminal cable from the bat-
P Squib
Sensor tery, and wait at least for 90 seconds.
Assy (c) Connect the instrument panel passenger airbag assy
Center connector.
(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-
DLC3 DTC B1187/55
conds.
(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.
CG Tc
(h) Turn the ignition switch to ON, and wait at least for 20 se-
H01024
H10600 H16838 H41984 conds.
(i) Check the DTC (See page 05–424).
OK:
DTC B1187/55 is not output.
HINT:
Codes other than code B1187/55 may be output at this time, but
they are not relevant to this check.
NG REPLACE INSTRUMENT PANEL PASSENGER
AIR BAG ASSY

OK

4 USE SIMULATION METHOD TO CHECK

NG Go to step 1

OK

REPLACE ALL SRS COMPONENTS INCLUDING THE WIRE HARNESS

2004 COROLLA (RM1037U)

Author: Date: 743