Lexus ES300 (1997 year). Manual — part 394
R15195
Airbag Sensor
Assembly
1
2
2
P+
P–
P Squib
Y–R
Y–G
3
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–353
505
1997 LEXUS ES300 (RM511U)
DTC
53
Short in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see OPERATION on page
.
DTC 53 is recorded when a short is detected in the P squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
53
Short circuit between P+ wire harness or P– wire harness
of squib
P squib malfunction
Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Preparation. (See step ” 1 ” on page
DI0B5–01
R05898
R14287
H00045
Airbag Sensor
Assembly
Spiral
Cable
P Squib
D Squib
P–
P+
(–)
(+)
AB0118
R13006
AB0119
W01933
R05169
H00046
Airbag Sensor
Assembly
P Squib
D Squib
Spiral
Cable
ACC
ON
or
DLC1
E1
Tc
Code 53
DI–354
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
506
1997 LEXUS ES300 (RM511U)
2
Check P squib circuit.
PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector
(See page
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly, measure the resistance between P+ and P–.
OK:
Resistance: 1M
Ω
or Higher
NG
Repair or replace harness or connector be-
tween airbag sensor assembly and front pas-
senger airbag assembly.
OK
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect connector to airbag sensor assembly.
(b)
Connect negative (–) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(b)
Clear malfunction code stored in memory
(See page
(c)
Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e)
Using SST, connect terminal Tc and E1 of DLC1.
SST 09843–18020
(f)
Check DTC.
OK:
DTC 53 is not output.
HINT:
Codes other than code 53 may be output at this time, but they
are not relevant to this check.
R05909
AB0118
R13006
AB0119
R05169
H00047
Airbag Sensor
Assembly
P Squib
D Squib
Spiral
Cable
ACC
ON
or
DLC1
E1
Tc
Code 53
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–355
507
1997 LEXUS ES300 (RM511U)
NG
Replace airbag sensor assembly.
OK
4
Check P squib.
PREPARATION:
(a)
Turn ignition switch to LOCK.
(b)
Disconnect negative (–) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect front passenger airbag assembly connector.
(d)
Connect negative (–) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn igniton switch to LOCK, and wait at least 20 se-
conds.
(b)
Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(c)
Clear malfunction code stored in memory
(See page
(d)
Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(e)
Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(f)
Using SST, connect terminal Tc and E1 of DLC1.
SST 09843–18020
(g)
Check DTC.
OK:
DTC 53 is not output.
HINT:
Codes other than code 53 may be output at this time, but they
are not relevant to this check.
NG
Replace front passenger airbag 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.
R15195
Airbag Sensor
Assembly
1
2
2
P+
P–
P Squib
3
Y–R
Y–G
DI–356
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
508
1997 LEXUS ES300 (RM511U)
DTC
54
Open in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see OPERATION on page
.
DTC 54 is recorded when an open is detected in the P squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
54
Open circuit in P+ wire harness or P– wire harness of
squib
P squib malfunction
Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Preparation. (See step ” 1 ” on page
DI0B6–01
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