Lexus RX300 (MCU15). Manual — part 298
H03354
H09507
H08351
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(–)
+SR
–SR
Engine Room No. 2
Wire Harness
(+)
←
→
DI–424
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
10
Check engine room No. 2 wire harness.
PREPARATION:
Disconnect the engine room No. 2 wire harness connector on
the airbag sensor assembly side.
CHECK:
For the connector (on the engine room No. 2 wire harness side)
between the airbag sensor assembly and the engine room No.
2 wire harness, measure the resistance between +SR and –SR.
OK:
Resistance: 1 MΩ or Higher
NG
Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.
H03352
H09507
H03360
H08350
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)
+SR
(–)
–SR
Engine Room No. 2
Wire Harness
+SR
–SR
←
→
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–425
LEXUS RX300 (RM785E)
11
Check engine room No. 2 wire harness.
PREPARATION:
(a)
Disconnect the engine room No. 2 wire harness connec-
tor on the airbag sensor assembly side.
(b)
Using a service wire, connect +SR and –SR of the con-
nector (on the engine room No. 2 wire harness side) be-
tween the engine room No. 2 wire harness and the front
airbag sensor (RH).
CHECK:
For the connector (on the engine room No. 2 wire harness side)
between the airbag sensor assembly and the engine room No.
2 wire harness, measure the resistance between +SR and –SR.
OK:
Resistance: Below 1 Ω
NG
Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.
H05156
Airbag Sensor Assembly
Front Airbag Sensor (LH)
15
26
2
1
+SL
–SL
A28
S8
S8
A28
+SL
–SL
1
1
2
2
S̷
S̷
BR
W–R
Short Connector
W
B
DI–426
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
DTC
B1158/B1159/16
Front Airbag Sensor (LH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (LH) circuit consists of the airbag sensor assembly and front airbag sensor (LH).
For details of the function of each component, see OPERATION on page RS–2.
DTC B1158/B1159/16 is recorded when malfunction is detected in the front airbag sensor (LH) circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B1158/B1159/16
S Front airbag sensor (LH) malfunction
S Front airbag sensor (LH)
S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
DI850–01
AB0119
H01370
H08065
H16264
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)
+SL
(–)
–SL
Airbag Sensor Assembly
ON
H01370
H08399
H16265
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)
+SL
(–)
–SL
Airbag Sensor Assembly
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–427
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 (LH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of +SL and –SL.
OK:
Voltage: Below 1 V
NG
Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK
3
Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of +SL and –SL.
OK:
Resistance: 1 MΩ or Higher
NG
Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK
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