Lexus RX300 (MCU15). Service manual — part 301
N14677
Fuse
AB0119
H01300
H01301
Airbag Sensor Assembly
ON
LA
(+)
(–)
DI–436
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
Does not light up, when ignition switch is turned to ON
1
Check AM2 Fuse.
PREPARATION:
Remove the AM2 fuse.
CHECK:
Check continuity of the AM2 fuse.
OK:
Continuity
HINT:
S
Fuse may be burnt out even if it appears to be OK during
visual inspection.
S
If fuse is OK, install it.
NG
Go to step 5.
OK
2
Prepare for inspection (See step 1 on page DI–431).
3
Check SRS warning light circuit.
PREPARATION:
(a)
Connect negative (–) terminal cable to the battery.
(b)
Turn the ignition switch to ON.
CHECK:
Measure the voltage between body ground and LA terminal of
the harness side connector of the airbag sensor assembly.
OK:
Voltage: 10 – 14 V
NG
Check SRS warning light bulb or repair SRS
warning light circuit.
OK
AB0119 H05060
H16274
H16793
P Squib
D Squib
P/T Squib (LH)
P/T Squib (RH)
Side Squib (LH)
Side Squib (RH)
Spiral
Cable
Front Airbag
Sensor (RH)
Front Airbag
Sensor (LH)
Side Airbag
Sensor (LH)
Side Airbag
Sensor (RH)
ON
Airbag Sensor
Assembly
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–437
LEXUS RX300 (RM785E)
4
Does SRS warning light come on?
PREPARATION:
(a)
Disconnect negative (–) terminal cable from the battery.
(b)
Connect the airbag sensor assembly connector.
(c)
Connect negative (–) terminal cable to the battery, and
wait at least for 2 seconds.
(d)
Turn the ignition switch to ON.
CHECK:
Check operation of the SRS warning light.
NO
Check terminal LA of airbag sensor assembly.
If normal, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use simulation method to check.
DI–438
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
5
Is new AM2 fuse burnt out again?
NO
Using simulation method, reproduce malfunc-
tion symptoms (See page IN–22).
YES
Check harness between AM2 fuse and SRS
warning light.
H16261
Airbag Sensor
Assembly
A28
19
P–B
8
11
1L
1E
Instrument Panel J/B
P–B
Tc
5F
5C
4
7
J/B No. 5
P–B
13
DLC3
D3
W–B
11
5B
5B
3
W–B
4
GC
IF
Tc
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–439
LEXUS RX300 (RM785E)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and CG of the DLC3 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by blinking the SRS warning light.
WIRING DIAGRAM
DI6Q0–08
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст