Lexus RX300 (MCU15). Manual — part 284
H01019
H16276
H16625
Squib (LH)
Airbag
Sensor
Assembly
(–)
(+)
SFL+
DI–368
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
DTC
B0117/45
Short in Side Squib (LH) Circuit
(to Ground)
CIRCUIT DESCRIPTION
The side squib (LH) circuit consists of the airbag sensor assembly and side airbag assembly (LH).
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 B0117/45 is recorded when ground short is detected in the side squib (LH) circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B0117/45
S Short circuit in side squib (LH) wire harness (to ground)
S Side squib (LH) malfunction
S Airbag sensor assembly malfunction
S Side airbag assembly (LH)
S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
See page DI–361.
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check side squib (LH) circuit.
CHECK:
For the connector (on the side airbag assembly side) between
the side airbag assembly (LH) and the airbag sensor assembly,
measure the resistance between SFL+ and body ground.
OK:
Resistance: 1 MΩ or Higher
NG
Repair or replace harness or connector be-
tween side airbag assembly (LH) and airbag
sensor assembly.
OK
DI6PH–03
AB0119
H10600
H01017
H01071
H16278
H16626
Squib (LH)
Airbag
Sensor
Assembly
SFL+
SFL–
→
←
DLC3
ON
CG
Tc
DTC B0117/45
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–369
LEXUS RX300 (RM785E)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to the airbag sensor assembly.
(b)
Using a service wire, connect SFL+ and SFL– of the con-
nector (on the side airbag assembly side) between the
side airbag assembly (LH) and the airbag sensor assem-
bly.
(c)
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 step 5 on 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 B0117/45 is not output.
HINT:
Codes other than code B0117/45 may be output at this time, but
they are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H10600
H01018 AB0119
H01071
H12030
→ ←
Tc
Airbag
Sensor
Assembly
Squib (LH)
DTC B0117/45
ON
DLC3
CG
DI–370
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
4
Check side squib (LH).
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 side airbag assembly (LH) connector.
(d)
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 step 5 on 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 B0117/45 is not output.
HINT:
Codes other than code B0117/45 may be output at this time, but
they are not relevant to this check.
NG
Replace front side airbag assembly (LH).
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. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.
H01016
AB0119
H16277
H16627
Squib (LH)
Airbag
Sensor
Assembly
SFL+
(–)
(+)
ON
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–371
LEXUS RX300 (RM785E)
DTC
B0118/46
Short in Side Squib (LH) Circuit (to B+)
CIRCUIT DESCRIPTION
The side squib (LH) circuit consists of the airbag sensor assembly and side airbag assembly (LH).
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 B0118/46 is recorded when a B+ short is detected in the side squib (LH) circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B0118/46
S Short circuit in side squib (LH) wire harness (to B+)
S Side squib (LH) malfunction
S Airbag sensor assembly malfunction
S Side airbag assembly (LH)
S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
See page DI–361.
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check side squib (LH) circuit.
CHECK:
(a)
Turn the ignition switch to ON.
(b)
For the connector (on the side airbag assembly side) be-
tween the side airbag assembly (LH) and the airbag sen-
sor assembly, measure the voltage between SFL+ and
body ground.
OK:
Voltage: 0 V
NG
Repair or replace harness or connector be-
tween side airbag assembly (LH) and airbag
sensor assembly.
OK
DI6PI–03
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