Lexus ES300 (1997 year). Manual — part 388
DI0AY–01
W02759
1
2
3
4
5
6
7
8
9
10
A
B
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–329
481
1997 LEXUS ES300 (RM511U)
TERMINALS OF ECM
No.
Symbol
Terminal Name
A
–
Electrical Connection Check Mechanism
B
–
Electrical Connection Check Mechanism
1
P–
Squib
(
Passenger)
2
P+
Squib (Passenger)
3
LA
SRS Warning Light
4
D–
Squib (Driver)
5
D+
Squib (Driver)
6
Tc
Diagnosis
7
E2
Ground
8
E1
Ground
9
IG2
Power Source (IGN Fuse)
10
ACC
Power Source (CIG Fuse)
DI0AZ–01
DI–330
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
482
1997 LEXUS ES300 (RM511U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Symptom
Suspect Area
See page
With the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light is always lit up even when ignition switch is in
the LOCK position.
SRS warning light circuit
(Always lights up when ignition switch is in LOCK posi-
tion.)
With the ignition switch at ACC or ON, the SRS warning lights
does not light up.
SRS warning light circuit
(Does not light up when ignition switch is turned to ACC or
ON.)
DTC not displayed.
SRS warning light is always lit up a DTC check procedure.
DTC displayed without Tc and E1 terminal connection.
Tc terminal circuit
DI0B0–01
R16017
Airbag Sensor Assembly
P Squib
D Squib
Spiral
Cable
1
2
2
1
2
P+
P–
D+
D–
Y–R
Y–B
Y–G
Y
3
6
7
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–331
483
1997 LEXUS ES300 (RM511U)
CIRCUIT INSPECTION
DTC
11
Short in Squib Circuit (to Ground)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. If causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page
DTC 11 is recorded when ground short is detected in the squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
11
Short circuit in squib wire harness (to ground)
Squib malfunction
Spiral cable malfunction
Airbag sensor assembly malfunction
Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
R05901
R14301
H00053
Airbag Sensor
Assembly
P Squib
D Squib
Spiral
Cable
D+
(+)
(–)
R05896
R14301
H00054
Spiral
Cable
Airbag Sensor
Assembly
P Squib
D Squib
P+
(+)
(–)
DI–332
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
484
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Preparation. (See step ” 1 ” on page
2
Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D+ and body ground.
OK:
Resistance: 1M
Ω
or Higher
NG
Go to step ” 7 ”.
OK
3
Check P squib circuit.
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 body
ground.
OK:
Resistance: 1M
Ω
or Higher
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