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DI-398
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4CR-05

DTC B0108/52 Short in P Squib Circuit (to B+)

CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-2 .
DTC B0108/52 is recorded when a B+ short is detected in the P squib circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in P squib wire harness (to B+) S Front passenger airbag assembly (P squib)
B0108/52 S P squib malfunction S Airbag sensor assembly
S Airbag sensor assembly malfunction S Wire harness

WIRING DIAGRAM
See page DI-388 .

INSPECTION PROCEDURE

1 Prepare for inspection (See step 1 on page DI-486 ).

2 Check P squib circuit.

CHECK:
(a) Turn the ignition switch to ON.
Airbag (b) For the connector (on the front passenger airbag assem-
Sensor bly side) between the front passenger airbag assembly
Assembly and the airbag sensor assembly, measure the voltage be-
P Squib
tween the P+ and body ground.
OK:
ON Voltage: 0 V
P+

(-) (+)
H01022
AB0119 NG Repair or replace harness or connector be-
H02146 H04524 tween front passenger airbag assembly and air-
bag sensor assembly.

2001 SIENNA (RM787U)

Author : Date : 552
DI-399
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

3 Check airbag sensor assembly.

PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
P Squib Airbag (b) Using a service wire, connect P+ and P- of the connector
Sensor (on the front passenger airbag assembly side) between
Assembly the front passenger airbag assembly and the airbag sen-
sor assembly.

(c) Connect negative (-) terminal cable to the battery, and
ACC ON wait at least for 2 seconds.
P+ CHECK:
P-
(a) Turn the ignition switch to ACC or ON and wait at least for
or
20 seconds.
(b) Clear the DTC stored in memory
DLC1 DTC B0108/52 (See step 5 on page DI-358 ).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
E1 Tc for 20 seconds.
H01023 H02144
(e) Check the DTC (See page DI-358 ).
AB0118 AB0118
R13006 H01076 H02257 OK:
DTC B0108/52 is not output.
HINT:
Codes other than code B0108/52 may be output at this time, but
they are not relevant to this check.

NG Replace airbag sensor assembly.

2001 SIENNA (RM787U)

Author : Date : 553
DI-400
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

4 Check P squib.

PREPARATION:
(a) Turn the ignition switch to LOCK.
P Squib (b) Disconnect negative (-) terminal cable from the battery,
Airbag
Sensor and wait at least for 90 seconds.
Assembly (c) Connect the front passenger airbag assembly connector.

(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
ACC ON
(a) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
or (b) Clear the DTC stored in memory
(See step 5 on page DI-358 ).
DLC1 DTC B0108/52 (c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-358 ).
E1 Tc
H01024
OK:
AB0118 AB0119
R13006 H01076 H01199 DTC B0108/52 is not output.
HINT:
Codes other than code B0108/52 may be output at this time, but
they are not relevant to this check.

NG Replace front passenger airbag assembly.

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.

2001 SIENNA (RM787U)

Author : Date : 554

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