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DI-398
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI1BQ-42
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
Airbag Sensor
Assembly
D1 DLC3
Instrument Panel J/B
3 4 19
P-B P-B (W)
Tc 1P 1D C4 Tc
13
17 2
W-B W-B
CG 1P 1O
4
ID
H10661
2002 ECHO (RM884U)
Author : Date : 568
DI-399
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
If the DTC is not displayed, do the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
PREPARATION:
Check operation of the SRS warning light after ignition switch
LOCK ON is turned from LOCK position to ON position.
AB0117 AB0119
H10589 H13131
NO Check SRS warning light system.
(See page DI-393 )
YES
2 Check voltage between terminals Tc and CG of DLC3.
PREPARATION:
ON
Turn ignition switch to ON.
CG CHECK:
Measure the voltage between terminals Tc and CG of DLC3.
OK:
Voltage: 4 - 14 V
Tc
(-) (+)
AB0119
H10688 H10654
OK Go to step 4.
NG
2002 ECHO (RM884U)
Author : Date : 569
DI-400
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check voltage between terminal Tc of DLC3 and body ground.
ON CHECK:
Measure the voltage between terminal Tc of DLC3 and body
ground.
OK:
Voltage: 4 - 14 V
Tc
(-) (+)
OK Check harness between terminal CG of DLC3
AB0119
H10656
and body ground.
H10689
NG
4 Check airbag sensor assembly.
PREPARATION:
LOCK ON (a) Turn ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
Airbag Sensor Assembly (c) Disconnect the airbag sensor assembly connector.
(d) Insert service wire into terminal Tc from back side as
shown in the illustration.
(e) Connect the airbag sensor assembly connector with ser-
vice wire.
(f) Connect negative (-) terminal cable to the battery.
(g) Turn ignition switch to ON and wait at least for 20 se-
conds.
Tc
(h) Connect service wire of terminal Tc to body ground.
AB0117 AB0119
H01302 H12918 CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
OK Check harness between the airbag sensor as-
sembly and DLC3.
NG
Replace airbag sensor assembly.
2002 ECHO (RM884U)
Author : Date : 570
DI-401
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
If the DTC is displayed without a DTC check procedure, perform the following
troubleshooting.
1 Check resistance between terminal Tc of airbag sensor assembly and body
ground.
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.
Tc (c) Disconnect the airbag sensor assembly connector.
CHECK:
(-) (+) Check resistance between terminal Tc of the airbag sensor as-
sembly connector and body ground.
AB0119
H01304 H01305 OK:
Resistance: 1 M or Higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.
2002 ECHO (RM884U)
Author : Date : 571
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