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DTC 15 Open in Front Airbag Sensor Circuit
CIRCUIT DESCRIPTION
The front airbag sensor detects the deceleration force in a frontal collision and is located in the front fender on
the left and right sides.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS±4. Diagnostic
trouble code 15 is recorded when an open is detected in the front airbag sensor circuit.
NOTICE: The front airbag sensor connector is equipped with an electrical connection check mechanism
for the purpose of detecting an open in the front airbag sensor (See page RS±36). This mechanism is
constructed so that when the terminals of the front airbag sensor have been connected (when the con-
nector housing lock is in the locked condition), the connection detection pin on the wire harness side
connects with the terminals for diagnosis use on the sensor side. If the connector is not properly con-
nected, the diagnostic system may detect only a malfunction code, even though the SRS is functioning
normally.
When connecting the front airbag sensor connector, make sure it is connected properly. If diagnostic
trouble code 15 is displayed after the front airbag sensor connector has been connected, check again
that it is properly connected.
DTC No. Diagnosis
15
Open circuit in + S wire harness or ± S wire harness of front airbag sensor.
Front airbag sensor malfunction.
Malfunction of electrical connection check mechanism of front airbag sensor.
Center airbag sensor assembly malfunction.
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Preparation.
(1) Disconnect negative (±) terminal cable from the
battery, and wait at least 20 seconds.
(2) Remove steering wheel pad (See page RS±10).
(3) Disconnect connector of front passenger airbag
assembly (See RS20).
Check front airbag sensor circuit (Measure resistance between terminals
+SR and ±SR, +SL and ±SL of center airbag sensor assembly connector.).
Disconnect center airbag sensor assembly connec-
tor.
Measure resistance between terminals +SR and
±SR, +SL and ±SL of harness side connector of
center airbag sensor assembly.
Resistance: 755 Ð 885
Store the steering wheel pad with the front sur-
face facing upward.
INSPECTION PROCEDURES [P] Preparation [C] Check
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±79
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Check center airbag sensor assembly.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory. (See
page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of DLC1
and DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 15 is not output.
Codes other than code 15 may be output at this
time, but they are not relevant to this check.
Replace center airbag sensor assembly.
(1) Connect connector to center airbag sensor
assembly.
(2) Using a service wire, connect D
+ and D± on spiral
cable side of connector between spiral cable and
steering wheel pad.
(3) Using a service wire, connect P
+ and P± on center
airbag sensor assembly side of connector be±
tween center airbag sensor assembly and front
passenger airbag assembly.
(4) Connect negative (±) terminal cable to battery, and
wait at least 2 seconds.
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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Check front airbag sensor.
Disconnect front airbag sensor connector.
Measure resistance between each terminal of front
airbag sensor.
Do not press ohmmeter probes too strongly
against terminals of front airbag sensor.
Make sure the front airbag sensor connector is
properly connected.
Replace front airbag sensor.
Check harness between center airbag sensor assembly and front airbag
sensor.
(1) Disconnect center airbag sensor assembly
connector.
(2) Using service wires, connect +SR and ±SR, +SL
and ±SL on the wire harness side of the center
airbag sensor assembly connectors.
Measure resistance between terminals ±SR and
±SR, +SL and ±SL of harness side connector of front
airbag sensor.
Resistance: Less than 1
Replace front airbag sensor connector.
(See page RS±36)
Lightly touch ohmmeter probes at position
shown in illustration.
Make sure the front airbag sensor connector is
properly connected.
Repair or replace harness or connector be-
tween center airbag sensor assembly and
front airbag sensor (See page RS±36).
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±81
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DTC 22 SRS Warning Light System Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the cluster finish panel.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is turned
from LOCK position to ACC or 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 E
1 of the DLC1 or DLC2 are connected, the diagnostic trouble code is displayed by the blinking
of the SRS warning light.
The SRS warning light circuit is equipped with an electrical connection check mechanism which detects when
the connector to the center airbag sensor assembly is not properly connected.
If the connector to the center airbag sensor assembly is not properly connected, the SRS warning light will not
light up.
Diagnostic trouble code 22 is recorded when a malfunction occurs in the SRS warning light system. If an OPEN
malfunction occurs in the SRS warning light system, the SRS warning light does not light up, so that until the
malfunction is repaired, the diagnostic trouble codes (including code 22) cannot be confirmed.
DTC No.
Diagnosis
22
Open circuit in SRS warning light system.
Center airbag sensor assembly malfunction.
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(See page RS±20).
(See page RS±10).
Check ECU±B Fuse.
Remove ECU±B fuse.
Check continuity of ECU±B fuse.
Continuity
Check connection of center airbag sensor assembly connector.
(1) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(2) Remove steering wheel pad (See page RS±10).
(3) Disconnect connector of front passenger airbag
assembly (See page RS±20).
Preparation.
Repair.
Store the steering wheel pad with the front sur-
face facing upward.
Fuse may be burnt out even if it appears to be OK
during visual inspection.
If fuse is OK, install it.
INSPECTION PROCEDURES [P] Preparation [C] Check
HINT: If SRS warning light does not light up, perform the following troubleshooting:
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±83
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Check SRS warning light circuit.
Repair SRS warning light circuit.
Does SRS warning light come on?
Using simulation method, reproduce mal-
function symptoms (See page RS±48).
Check terminal LA of center airbag sensor assem-
bly and electrical connection check mechanism. If
normal, replace center airbag sensor assembly.
(1) Disconnect center airbag sensor assembly
connector.
(2) Connect negative (±) terminal cable to battery.
(3) Turn ignition switch to ACC or ON.
Measure voltage LA terminal of harness side connec-
tor of center airbag sensor assembly.
Voltage: Battery positive voltage
(1) Disconnect negative (±) terminal cable from the
battery.
(2) Connect center airbag sensor assembly connec±
tor.
(3) Connect negative (±) terminal cable to battery,
and wait at least 2 seconds.
(4) Turn ignition switch to ACC or ON
Check operation of SRS warning light.
SRS warning light comes on.
Check harness between ECU±B fuse and SRS
warning light.
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.
Is new ECU±B fuse burnt out again?
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HINT: If diagnostic trouble code 22 is output, do the following troubleshooting:
Is diagnostic trouble code 22 output again?
Repair SRS warning light circuit.
(1) Turn ignition switch to LOCK, and wait at least
2 seconds.
(2) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(3) Clear malfunction code stored in memory. (See
page RS±47)
(4) Turn ignition switch to LOCK, and wait at least 20
seconds.
(5) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(6) Using SST, connect terminals Tc and E1 of DLC1
or DLC2.
SST 09843±18020
(7) Check diagnostic trouble code.
Replace center airbag sensor assembly.
Using simulation method, reproduce mal-
function symptoms (See page RS±48).
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±85