CIRCUIT DESCRIPTION. The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in case the source voltage ...
CIRCUIT DESCRIPTION The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in case the source voltage drops. When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage. The diagnosis system malfunction display for this circuit is different from other circuits that is when the SRS warning light remains lit up and the DTC is a normal code, source voltage drop is indicated. Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to normal, the SRS warning light automatically goes off. DTC No.
Diagnosis
(Normal)
Source voltage drop
WIRING DIAGRAM
Instrument Panel J/B
I10 Ignition Switch 1
2
B-Y
4 7.5A ECU-IG 10 1O 1D
6
B-R
6 1O
5 1D
1 1O
7 1A
AM1 IG1 5 AM2 IG2 W-R
40A AM1
8 1O
W-L F6 Fusible Link Block 120A ALT (*3) 100A ALT (*4)
Airbag Sensor Assembly
2
L (SB)
6 C4 IG1
B-O (SB)
5 C4 IG2
W-R
1 1C
1 B (*1) B-G (*2)
4
Engine Room R/B No. 1 60A MAIN Battery
2 B-L
15A AM2 1
1 1
2
*1: Puerto Rico *2: Except Puerto Rico *3: Except Puerto Rico: U.S.A. A/T w/o ABS, Daytime Running Light, Cold Area Spec. *4: Puerto Rico: U.S.A. A/T w/o ABS, Daytime Running Light, Cold Area Spec.
H10659
2002 ECHO (RM884U)
Author:
Date:
560
DI-391 DIAGNOSTICS
-
SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE 1
Prepare for inspection. LOCK
Airbag Sensor Assembly
P/T Squib (RH)
Front Airbag Sensor (RH) D Squib Spiral Cable
P Squib Front Airbag Sensor (LH)
PREPARATION: (a) Disconnect negative (-) terminal cable from the battery, and wait at least for 90 seconds. (b) Remove the steering wheel pad. (See page SR-13 ) (c) Disconnect the connector of the front passenger airbag assembly. (See page RS-28 ) (d) Disconnect the connector of the seat belt pretensioner RH and LH. (See page BO-1 14) (e) Disconnect the connectors of the airbag sensor assembly. (See page RS-52 ) (f) Disconnect the connector of the front airbag sensor RH and LH. (See page RS-57 ) CAUTION: Store the steering wheel pad and front passenger airbag assembly with the front surface facing upward.
P/T Squib (LH) AB0117 H03372
2
H04512
Check source voltage.
ON
Airbag Sensor Assembly
IG1 (-)
IG2
(+)
AB0119 H01298
H01299
PREPARATION: Connect negative (-) terminal cable to the battery. CHECK: (a) Turn the ignition switch ON. (b) Measure the voltage between body ground and each of terminals IG1 and IG2 and operate electric system. (defogger, wiper, headlight, heater blower, etc.) OK: Voltage: 10 - 14 V NG
Check harness between battery and airbag sensor assembly, and check battery and charging system.
OK
2002 ECHO (RM884U)
Author:
Date:
561
DI-392 DIAGNOSTICS
3
-
SUPPLEMENTAL RESTRAINT SYSTEM
Does SRS warning light turn off?
ON
H01249
PREPARATION: (a) Turn the ignition switch to LOCK. (b) Connect the steering wheel pad connector. (c) Connect the front passenger airbag assembly connector. (d) Connect the seat belt pretensioner connectors. (e) Connect the airbag sensor assembly connectors. (f) Connect the front airbag sensor connectors. (g) Turn the ignition switch to ON. CHECK: Operate electric system (defogger, wiper, headlight, heater blower, etc.) and check that SRS warning light goes off. NO
Check for DTCs. If a DTC is output, perform troubleshooting for the DTC. If a normal code is output, 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 the simulation method to check.
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