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DI-374
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4LA-26
DTC B1156/B1157/15 Front Airbag Sensor (RH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS-2 .
DTC B1156/B1157/15 is recorded when a malfunction is detected in the front airbag sensor (RH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Front airbag sensor (RH)
S Wire harness
B1156/B1157/15 S Front airbag sensor (RH) malfunction
S Engine room main wire harness
S Airbag sensor assembly
WIRING DIAGRAM
F2
Front Airbag Sensor (RH) Airbag Sensor Assembly
2 9
B-W B-W (SB)
ID1 C4 +SR
2
1 20
BR-W BR-W(SB)
ID1 C4 -SR
1
H02750
2002 ECHO (RM884U)
Author : Date : 544
DI-375
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-390 ).
2 Check wire harness (to B+).
CHECK:
(a) Turn the ignition switch to ON.
Airbag (b) For the connector (on the airbag sensor assembly side)
Sensor
between the front airbag sensor (RH) and the airbag sen-
Assembly
sor assembly, measure the voltage between body ground
Front Airbag
Sensor (RH) and each of +SR and -SR.
Airbag Sensor
Assembly OK:
ON Voltage: Below 1 V
SR+
(+)
H03355
(-) SR-
AB0119 NG Go to step 8.
H03363 H03445
OK
3 Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag tween the front airbag sensor (RH) and the airbag sensor as-
Sensor sembly, measure the resistance between body ground and
Assembly
each of +SR and -SR.
Front Airbag OK:
Sensor (RH) Airbag Sensor
Assembly Resistance: 1 M or Higher
SR+
(+)
(-) SR-
H03353
H03361 H03443 NG Go to step 9.
OK
2002 ECHO (RM884U)
Author : Date : 545
DI-376
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check wire harness.
Front Airbag CHECK:
Sensor (RH) For the connector (on the airbag sensor assembly side) be-
Airbag tween the front airbag sensor (RH) and the airbag sensor as-
Sensor sembly, measure the resistance between +SR and -SR.
Assembly
OK:
Resistance: 1 M or Higher
Airbag Sensor
Assembly
(+) SR+
(-)
SR-
H03355
H03356 H09518
NG Go to step 10.
OK
5 Check wire harness.
Front Airbag PREPARATION:
Sensor (RH)
Using a service wire, connect +SR and -SR of the connector
Airbag (on the front airbag sensor (RH) side) between the airbag sen-
Sensor
sor assembly and the front airbag sensor (RH).
Assembly
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag Sensor
Assembly
tween the front airbag sensor (RH) and the airbag sensor as-
SR+ SR-
sembly, measure the resistance between +SR and -SR.
OK:
(+) SR+ Resistance: Below 1
(-)
SR-
H03353
H09521H03356 H09523 NG Go to step 11.
OK
2002 ECHO (RM884U)
Author : Date : 546
DI-377
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
6 Check front airbag sensor (RH).
Front Airbag CHECK:
Sensor (RH) For the connector of the front airbag sensor (RH), measure the
Airbag
resistance between +SR and -SR.
Sensor OK:
Assembly Resistance: 300 - 1500
+SR -SR
(+) (-)
H04504
H01062 H08346
NG Replace front airbag sensor (RH).
OK
2002 ECHO (RM884U)
Author : Date : 547
DI-378
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 Check airbag sensor assembly.
PREPARATION:
Front Airbag
Sensor (RH) (a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
Airbag
and wait at least for 90 seconds.
Sensor
Assembly (c) Connect the front airbag sensor (RH) connector and air-
bag sensor assembly connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ON CHECK:
(a) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(b) Clear DTC stored in memory (See step 5 on page
DLC3 DTC B1156/B1157/15 DI-239 ).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ON, and wait at least for 20 se-
CG Tc conds.
H02757
(e) Check DTC (See page DI-239 ).
AB0119
H10600 H01063 H10638 OK:
DTC B1156/B1157/15 is not output.
HINT:
Codes other than code B1156/B1157/15 may be output at this
time, but they are not relevant to this check.
NG Replace airbag sensor 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.
2002 ECHO (RM884U)
Author : Date : 548
DI-379
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
8 Check engine room main wire harness (to B+).
Front Airbag PREPARATION:
Sensor (RH) Disconnect the engine room main wire harness connector on
Airbag the airbag sensor assembly side.
Sensor CHECK:
Assembly (a) Turn the ignition switch to ON.
Engine Room Main (b) For the connector (on the RH front door wire harness
Wire Harness
side) between the airbag sensor assembly and the en-
ON
gine room main wire harness, measure the voltage be-
+SR -SR tween body ground and each of +SR and -SR.
OK:
Voltage: Below 1 V
(-) (+)
H03354
NG Repair or replace engine room main wire har-
AB0119 ness.
H08298 H10639
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.
9 Check engine room main wire harness (to ground).
Front Airbag PREPARATION:
Sensor (RH) Disconnect the engine room main wire harness connector on
Airbag the airbag sensor assembly side.
Sensor CHECK:
Assembly For the connector (on the engine room main wire harness side)
between the airbag sensor assembly and the engine room main
Engine Room Main wire harness, measure the resistance between body ground
Wire Harness and each of +SR and -SR.
+SR -SR OK:
Resistance: 1 M or Higher
(-) (+)
NG Repair or replace engine room main wire har-
H03354
ness.
H08296 H10640
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.
2002 ECHO (RM884U)
Author : Date : 549
DI-380
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
10 Check engine room main wire harness.
Front Airbag Engine Room Main PREPARATION:
Wire Harness
Sensor (RH) Disconnect the engine room main wire harness connector on
Airbag the airbag sensor assembly side.
Sensor CHECK:
Assembly For the connector (on the engine room main wire harness side)
between the airbag sensor assembly and the engine room main
wire harness, measure the resistance between +SR and -SR.
OK:
+SR -SR
Resistance: 1 M or Higher
(+) (-)
H03354
H08294 H10641
NG Repair or replace engine room main wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.
2002 ECHO (RM884U)
Author : Date : 550
DI-381
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
11 Check engine room main wire harness.
Engine Room Main PREPARATION:
Front Airbag
Wire Harness (a) Disconnect the engine room main wire harness connector
Sensor (RH)
on the airbag sensor assembly side.
Airbag
Sensor (b) Using a service wire, connect +SR and -SR of the con-
Assembly nector (on the engine room main wire harness side) be-
tween the engine room main wire harness and the front
airbag sensor (RH).
CHECK:
+SR -SR +SR -SR For the connector (on the engine room main wire harness side)
between the airbag sensor assembly and the engine room main
wire harness, measure the resistance between +SR and -SR.
(+) (-) OK:
Resistance: Below 1
H03352
H09521 H08294 H10642
NG Repair or replace engine room main wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.
2002 ECHO (RM884U)
Author : Date : 551
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