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.
B1156/B1157/15
DTC Detecting Condition
Trouble Area
Front airbag sensor (RH)
Wire harness
Engine room main wire harness
Airbag sensor assembly
Front airbag sensor (RH) malfunction
WIRING DIAGRAM
F2
Front Airbag Sensor (RH)
Airbag Sensor Assembly
B-W
2
ID1
B-W (SB)
9
C4
BR-W
1
ID1
BR-W(SB)
20
C4 -SR
2
1
+SR
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+).
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
ON
(+)
H03355
AB0119
H03363
(-)
Airbag Sensor
Assembly
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the airbag sensor assembly side)
between the front airbag sensor (RH) and the airbag sensor assembly, measure the voltage between body ground
and each of +SR and -SR.
OK:
Voltage: Below 1 V
SR+
SRH03445
NG
Go to step 8.
OK
3
Check wire harness (to ground).
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)
(-)
H03353
H03361
Airbag Sensor
Assembly
CHECK:
For the connector (on the airbag sensor assembly side) between the front airbag sensor (RH) and the airbag sensor assembly, measure the resistance between body ground and
each of +SR and -SR.
OK:
Resistance: 1 MΩ or Higher
SR+
SRH03443
NG
Go to step 9.
OK
2002 ECHO (RM884U)
Author:
Date:
545
DI-376
DIAGNOSTICS
4
-
SUPPLEMENTAL RESTRAINT SYSTEM
Check wire harness.
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
Airbag Sensor
Assembly
CHECK:
For the connector (on the airbag sensor assembly side) between the front airbag sensor (RH) and the airbag sensor assembly, measure the resistance between +SR and -SR.
OK:
Resistance: 1 MΩ or Higher
SR+
(+)
(-)
SR-
H03355
H03356
H09518
NG
Go to step 10.
OK
5
Check wire harness.
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
SR+
SR-
(+)
(-)
H03353
H09521H03356
Airbag Sensor
Assembly
SR+
PREPARATION:
Using a service wire, connect +SR and -SR of the connector
(on the front airbag sensor (RH) side) between the airbag sensor assembly and the front airbag sensor (RH).
CHECK:
For the connector (on the airbag sensor assembly side) between the front airbag sensor (RH) and the airbag sensor assembly, measure the resistance between +SR and -SR.
OK:
Resistance: Below 1 Ω
SRH09523
NG
Go to step 11.
OK
2002 ECHO (RM884U)
Author:
Date:
546
DI-377
DIAGNOSTICS
6
SUPPLEMENTAL RESTRAINT SYSTEM
Check front airbag sensor (RH).
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
+SR
H04504
H01062
-
(+)
CHECK:
For the connector of the front airbag sensor (RH), measure the
resistance between +SR and -SR.
OK:
Resistance: 300 - 1500 Ω
-SR
(-)
H08346
NG
Replace front airbag sensor (RH).
OK
2002 ECHO (RM884U)
Author:
Date:
547
DI-378
DIAGNOSTICS
7
-
SUPPLEMENTAL RESTRAINT SYSTEM
Check airbag sensor assembly.
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
→←
→←
ON
DLC3
CG
DTC B1156/B1157/15
Tc
H02757
AB0119
H10600 H01063
H10638
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Connect the front airbag sensor (RH) connector and airbag sensor assembly connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON, and wait at least for 20 seconds.
(b) Clear DTC stored in memory (See step 5 on page
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 seconds.
(e) Check DTC (See page DI-239 ).
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
8
-
SUPPLEMENTAL RESTRAINT SYSTEM
Check engine room main wire harness (to B+).
Front Airbag
Sensor (RH)
←→
Airbag
Sensor
Assembly
Engine Room Main
Wire Harness
ON
+SR
(-)
-SR
(+)
PREPARATION:
Disconnect the engine room main wire harness connector on
the airbag sensor assembly side.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the RH front door wire harness
side) between the airbag sensor assembly and the engine room main wire harness, measure the voltage between body ground and each of +SR and -SR.
OK:
Voltage: Below 1 V
NG
H03354
AB0119
H08298
H10639
Repair or replace engine room main wire harness.
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
Sensor (RH)
Airbag
Sensor
Assembly
Engine Room Main
Wire Harness
+SR
(-)
-SR
PREPARATION:
Disconnect the engine room main wire harness connector on
the airbag sensor assembly side.
CHECK:
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 body ground
and each of +SR and -SR.
OK:
Resistance: 1 MΩ or Higher
(+)
NG
H03354
H08296
Repair or replace engine room main wire harness.
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
10
-
SUPPLEMENTAL RESTRAINT SYSTEM
Check engine room main wire harness.
Front Airbag
Sensor (RH)
Engine Room Main
Wire Harness
←→
+SR
(+)
H03354
H08294
Airbag
Sensor
Assembly
-SR
PREPARATION:
Disconnect the engine room main wire harness connector on
the airbag sensor assembly side.
CHECK:
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: 1 MΩ or Higher
(-)
H10641
NG
Repair or replace engine room main wire harness.
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
11
-
SUPPLEMENTAL RESTRAINT SYSTEM
Check engine room main wire harness.
Engine Room Main
Wire Harness
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
←→
+SR
-SR
+SR
(+)
H03352
H09521 H08294
-SR
(-)
PREPARATION:
(a) Disconnect the engine room main wire harness connector
on the airbag sensor assembly side.
(b) Using a service wire, connect +SR and -SR of the connector (on the engine room main wire harness side) between the engine room main wire harness and the front
airbag sensor (RH).
CHECK:
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 Ω
H10642
NG
Repair or replace engine room main wire harness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.
2002 ECHO (RM884U)
Author:
Date:
551