Toyota Corolla 2004 DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM

05–570

–DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

055ZP–04

DTC B1185/57 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 B1185/57 is recorded when a short is detected in the P squib (2nd step) circuit.

DTC No. DTC Detecting Condition Trouble Area

 Short circuit between P2+ wire harness and P2– wire

B1185/57

harness of squib.

 P squib (2nd step) malfunction
 Airbag sensor assy center malfunction

WIRING DIAGRAM

 Instrument panel passenger airbag assy (P squib, 2nd step)
 Airbag sensor assy center
 Instrument panel wire

A15
P Squib (2nd step)

P+

P–

Airbag Sensor Assy Center

Y–GR

3

Y–P

4

8

A13

7

A13

P2+

P2–

2004 COROLLA (RM1037U)

H01454

735Author: Date:

–DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

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.

(b) Disconnect the connectors between the airbag sensor

assy center and the instrument panel passenger airbag
assy.

(c) Release the airbag activation prevention mechanism of

the connector (on the airbag sensor assy center side) be­tween the airbag sensor assy center and the instrument
panel passenger airbag assy (See page 05–424 ).

(d) 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, mea­sure the resistance between P2+ and P2–.

OK:
Resistance: 1 MΩ or Higher

P2–

R14286

H41424

P Squib

P2+

Airbag
Sensor
Assy
Center

H41932

05–571

NG REPAIR OR REPLACE INSTRUMENT PANEL

OK

2 CHECK AIR BAG SENSOR ASSY CENTER

SST 09843–18040

(a) Connect the connector to the airbag sensor assy center.

P Squib

DLC3

CG

H01023
H10600 H16840

Airbag
Sensor
Assy
Center

DTC B1185/57

Tc

H41979

(b) Connect the negative (–) terminal cable to the battery,

and wait at least for 2 seconds.

(c) Turn the ignition switch to ON, and wait at least for 20 se-

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-

conds.
(g) Check the DTC (See page 05–424).

OK:

DTC B1185/57 is not output.

HINT:
Codes other than code B1185/57 may be output at this time, b u t
they are not relevant to this check.

WIRE

OK

2004 COROLLA (RM1037U)

NG REPLACE AIR BAG SENSOR ASSY CENTER

736Author: Date: