Lexus RX300 (MCU15). Service manual — part 296
AB0119
H01007
H01066
H10600
H12033
Airbag
Sensor
Assembly
Side Airbag Sensor
Assembly (RH)
CG
Tc
ON
DTC B1141/33
→
←
DLC3
DI–416
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
9
Check airbag sensor assembly.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
(c)
Disconnect the side airbag sensor (LH) from the connec-
tor and connect the side airbag sensor (RH) to the con-
nector.
(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 B1141/33 is not output.
HINT:
Codes other than code B1141/33 may be output at this time, but
they are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
AB0119
H01012
H01065
H10600
H13119
Airbag
Sensor
Assembly
Side Airbag Sensor
Assembly (LH)
CG
Tc
ON
DTC B1140/32
→
←
DLC3
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–417
LEXUS RX300 (RM785E)
10
Check side airbag sensor assembly (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 side airbag sensor (LH) to the connector that
the side airbag sensor (RH) was connected to.
(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 B1140/32 is not output.
HINT:
Codes other than code B1140/32 may be output at this time, but
they are not relevant to this check.
NG
Replace side airbag sensor 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.
H02750
Airbag Sensor Assembly
Front Airbag Sensor (RH)
+SR
–SR
A28
A28
9
20
B–W
BR–W
II2
1
2
W
B
2
1
+SR
–SR
II2
DI–418
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
DTC
B1156/B1157/15
Front Airbag Sensor (RH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS–2.
DTC B1156/B1157/15 is recorded when a malfunction is detected in the front airbag sensor (RH) circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B1156/B1157/15
S Front airbag sensor (RH) malfunction
S Front airbag sensor (RH)
S Airbag sensor assembly
S Wire harness
S Engine room No. 2 wire harness
WIRING DIAGRAM
DI6PW–07
H03363
H03355
AB0119
H03445
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)
+SR
(–)
–SR
Airbag Sensor
Assembly
ON
H03361
H03353
H03443
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)
+SR
(–)
–SR
Airbag Sensor
Assembly
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–419
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check wire harness (to B+).
CHECK:
(a)
Turn the ignition switch to ON.
(b)
For the connector (on the airbag sensor assembly side)
between the front airbag sensor (RH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of +SR and –SR.
OK:
Voltage: Below 1 V
NG
Go to step 8.
OK
3
Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of +SR and –SR.
OK:
Resistance: 1 MΩ or Higher
NG
Go to step 9.
OK
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