Lexus RX300 (MCU15). Service manual — part 271
DI–316
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
No.
Symbol
Terminal Name
A27 – 12
ESL
Side Airbag Sensor (LH)
A29 – 1
SFR+
Squib (Side, RH)
A29 – 2
SFR–
Squib (Side, RH)
A29 – 5
PR+
Squib (Pretensioner, RH)
A29 – 6
PR–
Squib (Pretensioner, RH)
A29 – 7
ESR
Side Airbag Sensor (RH)
A29 – 9
FSR
Side Airbag Sensor (RH)
A29 – 10
SSR+
Side Airbag Sensor (RH)
A29 – 12
VUPR
Side Airbag Sensor (RH)
DI6P2–05
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–317
LEXUS RX300 (RM785E)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Symptom
Suspect Area
See page
S With the ignition switch in ON position, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.
S SRS warning light is always lit up even when ignition switch is in
the LOCK position.
S SRS warning light circuit
DI–434
S With the ignition switch in ON position, the SRS warning light
does not light up.
S DTC is not displayed.
S SRS warning light is always lit up at the time of DTC check pro-
cedure.
S Tc terminal circuit
DI–439
S DTC is displayed without Tc and CG terminal connection.
DI6P3–07
H01451
Y–B
D+
A28
14
Airbag Sensor Assembly
13
A28 D–
Y
1
2
Spiral
Cable
D Squib
DI–318
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
DTC
B0100/13
Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS–2.
DTC B0100/13 is recorded when a short is detected in the D squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
B0100/13
S Short circuit between D+ wire harness and D– wire har-
ness of squib
S D squib malfunction
S Spiral cable malfunction
S Airbag sensor assembly malfunction
S Steering wheel pad (D squib)
S Spiral cable
S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
H01001
H02142
H02193
D Squib
Spiral
Cable
Airbag
Sensor
Assembly
D+
(–)
(+)
D–
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–319
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Prepare for inspection (See step 1 on page DI–431).
2
Check D squib circuit.
PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
airbag sensor assembly and the spiral cable (See page
DI–305).
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D–.
OK:
Resistance: 1 MΩ or Higher
NG
Go to step 5.
OK
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