Lexus RX300 (MCU15). Service manual — part 276
R14286
H02142
H02251
P Squib
Airbag
Sensor
Assembly
P +
P–
(–)
(+)
DI–336
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check P squib circuit.
PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
front passenger airbag assembly and the airbag sensor assem-
bly (See page DI–305).
CHECK:
For the connector (on the front passenger airbag assembly
side) between the front passenger airbag assembly and the air-
bag sensor assembly, measure the resistance between P+ and
P–.
OK:
Resistance: 1 MΩ or Higher
NG
Repair or replace harness or connector be-
tween front passenger airbag assembly and air-
bag sensor assembly.
OK
H01023
AB0119
H01077
H10600
H10611
P Squib
Airbag
Sensor
Assembly
DTC B0105/53
DLC3
ON
→
←
Tc
CG
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–337
LEXUS RX300 (RM785E)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to the airbag sensor assembly.
(b)
Connect negative (–) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a)
Turn the ignition switch to ON and wait at least for 20 se-
conds.
(b)
Clear the DTC stored in memory (See page DI–305).
(c)
Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d)
Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(e)
Check the DTC (See page DI–305).
OK:
DTC B0105/53 is not output.
HINT:
Codes other than code B0105/53 may be output at this time, but
they are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H01024
AB0119
H01077
H10600
H10612
→ ←
ON
DTC B0105/53
DLC3
Airbag
Sensor
Assembly
P Squib
Tc
CG
DI–338
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
4
Check P squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect negative (–) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a)
Turn the ignition switch to LOOK, and wait at least for 20
seconds.
(b)
Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(c)
Clear the DTC stored in memory (See page DI–305).
(d)
Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(e)
Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(f)
Check the DTC (See page DI–305).
OK:
DTC B0105/53 is not output.
HINT:
Codes other than code B0105/53 may be output at this time, but
they are not relevant to this check.
NG
Replace front passenger airbag assembly.
OK
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.
R14286
H02142
H02251
P Squib
Airbag
Sensor
Assembly
P +
P–
(–)
(+)
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–339
LEXUS RX300 (RM785E)
DTC
B0106/54
Open in P Squib Circuit
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 B0106/54 is recorded when an open is detected in the P squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B0106/54
S Open circuit in P+ wire harness or P– wire harness of
squib
S P squib malfunction
S Airbag sensor assembly malfunction
S Front passenger airbag assembly (P squib)
S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
See page DI–335.
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check P squib circuit.
CHECK:
For the connector (on the front passenger airbag assembly
side) between the front passenger airbag assembly and the air-
bag sensor assembly, measure the resistance between P+ and
P–.
OK:
Resistance: Below 1 Ω
NG
Repair or replace harness or connector be-
tween front passenger airbag assembly and air-
bag sensor assembly.
OK
DI6P8–01
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