Lexus RX300 (MCU15). Manual — part 299
H01370
H08058
H16266
Airbag
Sensor
Assembly
Front Airbag Sensor (LH)
(+)
+SL
(–)
–SL
Airbag Sensor
Assembly
H09526
H08058
H16267
Front Airbag
Sensor (LH)
Airbag
Sensor
Assembly
(+)
+SL
Airbag Sensor
Assembly
(–)
–SL
DI–428
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
4
Check wire harness.
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 +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
5
Check wire harness.
PREPARATION:
Using a service wire, connect +SL and –SL of the connector (on
the front airbag sensor (LH) side) between the airbag sensor
assembly and the front airbag sensor (LH).
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 +SL and –SL.
OK:
Resistance: Below 1 Ω
NG
Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK
H01009
H01371
H01155
Airbag
Sensor
Assembly
Front Airbag Sensor (LH)
(+)
+SL
(–)
–SL
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–429
LEXUS RX300 (RM785E)
6
Check front airbag sensor (LH).
CHECK:.
For the connector (on the front airbag sensor (LH)), measure
the resistance between +SL and –SL.
OK:
Resistance: 300 – 1500 Ω
NG
Replace front airbag sensor (LH).
OK
AB0119
H01369
H01063
H10600
H16268
Front Airbag
Sensor (LH)
Airbag
Sensor
Assembly
ON
DTC B1158/B1159/16
DLC3
CG
Tc
→ ←
→ ←
DI–430
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
7
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)
Connect the front airbag sensor (LH) connector and air-
bag sensor assembly 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 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 B1158/B1159/16 is not output.
HINT:
Codes other than code B1158/B1159/16 may be output at this
time, but they are not relevant to this check.
NG
Replace airbag sensor 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.
H17181
Battery
40A AM1
F11 FL Block
7.5A IGN
6
Instrument Panel J/B
I15 Ignition SW
3
W
B
Engine Room J/B
4
1
B–Y
2
W–L
7
W–R
3
1C
6
7
1
6
1
12
1G
W
W–L (*1)
W–R (*2)
GR
B–O
A28
6
5
IG1
IG2
2I
6
2C
W
1
5
140A ALT
1A
1L
1L
1C
1C
1C
15A SRS–IG
Airbag Sensor Assembly
20A AM2
1
1
2
IG2
IG1
AM2
AM1
A28
*1: LHD
*2: RHD
Instrument Panel J/B
A28
27
28
E1
E2
A28
W–B
W–B
W–B
W–B
A
A
A
J7
J/C
J9
J/C
1L
9
1L
10
1E
4
14
1D
IF
IG
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–431
LEXUS RX300 (RM785E)
DTC
Normal
Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage–increase circuit (DC–DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage–increase circuit (DC–DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different from other circuits that is when the SRS
warning light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.
Diagnosis
(Normal)
Source voltage drop
WIRING DIAGRAM
DI6PY–09
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