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DI-393
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI5RJ-21
SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and CG of the DLC3 are connected, the DTC is displayed by blinking the SRS warning
light.
WIRING DIAGRAM
Airbag Sensor
C13 Assembly
SRS Warning Light Instrument Panel J/B
12 14 7 8 3
B-Y B-Y (W)
C13 C13 1G 1D C4 LA
8 1P
B-R
Instrument Panel J/B
8 6 B-Y
B-R
1G 1O
I10 6
Instrument Panel J/B Ignition Switch A/B
7 1
W-R 5 6
1A 1O
AM2 IG2
ST2 D1 DLC3
W-R
F6 Fusible
Engine Room R/B
Link Block
15A AM2 60A MAIN
B-L 2
1 1
2 1
Battery
H12378
2002 ECHO (RM884U)
Author : Date : 563
DI-394
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
Always lights up, when ignition switch is in LOCK position
1 Prepare for inspection. (See step 1 on page DI-390 )
2 Does SRS warning light turn off?
LOCK 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) Disconnect the airbag sensor assembly connector.
(d) Connect negative (-) terminal cable to the battery.
CHECK:
Check operation of SRS warning light.
AB0117 H01293 H01295
NO Check SRS warning light circuit or terminal A/B
circuit of DLC3.
YES
Replace airbag sensor assembly.
2002 ECHO (RM884U)
Author : Date : 564
DI-395
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
Does not light up, when ignition switch is turned to ON
1 Check AM2 Fuse.
PREPARATION:
Fuse
Remove AM2 fuse.
CHECK:
Check continuity of AM2 fuse.
OK:
Continuity
HINT:
S Fuse may be burnt out even if it appears to be OK during
N14677 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-390 )
3 Check SRS warning light circuit.
Airbag Sensor Assembly PREPARATION:
ON (a) Connect negative (-) terminal cable to the battery.
(b) Turn the ignition switch to ON.
CHECK:
(+) LA Measure the voltage between body ground and LA terminal of
the harness side connector of the airbag sensor assembly.
(-) OK:
Voltage: 10 - 14 V
AB0119
H01300 H01301
NG Check SRS warning light bulb or repair SRS
warning light circuit.
OK
2002 ECHO (RM884U)
Author : Date : 565
DI-396
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Does SRS warning light come on?
PREPARATION:
P/T Squib (RH) (a) Disconnect negative (-) terminal cable from the battery.
(b) Connect the airbag sensor assembly connector.
(c) Connect negative (-) terminal cable to the battery, and
Front Airbag wait at least for 2 seconds.
Sensor (RH)
(d) Turn ignition switch to ON.
D Squib CHECK:
Spiral
Cable
Check operation of SRS warning light.
P Squib
Front Airbag
Sensor (LH)
P/T Squib (LH)
ON
Airbag
Sensor
Assembly
H05047
BE6653
H10589
H13130
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.
2002 ECHO (RM884U)
Author : Date : 566
DI-397
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 Is new AM2 fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms. (See page IN-19 )
YES
Check harness between AM2 fuse and SRS
warning light.
2002 ECHO (RM884U)
Author : Date : 567
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