Isuzu N-Series. Manual — part 1199
SRS CONTROL SYSTEM 9C-43
Step
Action
Value
YES
NO
1
Has the “SRS system check” been per-
formed?
—
Go to “SRS sys-
tem check”.
2
1. When measurement is required in this
chart, use 5-8840-0366-0 DMM and ap-
propriate terminal adapter in 5-8840-
0385-0 Connector test adapter kit.
2. Turn the starter switch to OFF.
3. Check the 2-pole connector (yellow) of
SRS coil assembly located in the lower
portion of steering column for proper con-
nection.
Is the 2-pole connector (yellow) connected
properly?
—
Connect the 2-
pole connector of
SRS coil assem-
bly properly.Go to
3
1. Remove the 2-pole connector (yellow) of
SRS coil assembly located in the lower
portion of steering column for inspection.
2. If it is normal, reconnect the 2-pole con-
nector of SRS coil assembly properly.
3. Turn the starter switch to ON.
Is DTC 26 detected as current trouble?
—
4
1. Turn the starter switch to OFF.
2. Remove the 2-pole connector (yellow) of
SRS coil assembly located in the lower
portion of steering column.
3. Connect the 5-8840-2421-0 SRS substi-
tute load and an appropriate terminal
adapter in 5-8840-0385-0 Connector test
adapter kit to the SRS harness side con-
nector which connects to SRS coil as-
sembly.
4. Turn the starter switch to ON.
Is DTC 26 detected as current trouble?
—
5
1. Turn the starter switch to OFF.
2. Driver’s airbag deployment circuit is
open.
3. Inspect the SRS airbag deployment cir-
cuit and SRS control unit connector ter-
minals “7” and “8”, and use high-
resolution resistance meter mode of
DMM to detect the cause.
Is the trouble detected?
—
Replace the SRS
harness.Go to
Go to Chart A
SRS control unit
function check.
9C-44 SRS CONTROL SYSTEM
6
1. Turn the starter switch to OFF.
2. Remove the 5-8840-2421-0 SRS substi-
tute load from SRS coil assembly har-
ness connector.
3. Connect the 5-8840-2421-0 SRS substi-
tute load to the upper portion of steering
column.
4. Reconnect the SRS coil assembly har-
ness connector to the lower portion of
steering column.
5. Turn the starter switch to ON.
Is DTC 26 detected as current trouble?
—
Turn the starter
switch to OFF.
Replace the SRS
coil assembly by
referring to “SRS
Coil Assembly” in
SRS section. Go
Turn the starter
switch to OFF.
Replace the SRS
airbag. Go to
7
1. Reconnect all the parts, and check that
those are installed properly.
2. Clear the DTC.
Is this step completed?
—
Repeat the “SRS
system check”.
Step
Action
Value
YES
NO
SRS CONTROL SYSTEM 9C-45
DTC: 51 SRS Airbag Deployment Current Had Output
Outline
Description of Circuit
A sensor is equipped to this circuit to convert the impact
applied to SRS control unit into an electrical signal.
The electrical signal generated at this time will be pro-
cessed in the SRS control unit to compare with the value
stored in the memory. When the generated signal ex-
ceeds the setting value, SRS control unit sends current
to the SRS airbag assembly for deployment, and set the
DTC 51.
Condition when DTC is Set
When the control unit detects the front collision over cer-
tain degree of impact.
Action to be Taken
SRS control unit turns the “SRS” warning lamp ON,
record the “collision data”, and set the DTC 51.
Condition when DTC is Cleared
When SRS control unit is replaced.
Description of DTC Chart Test
Numbers below indicate step numbers in the diagnostic
chart.
2. In case the DTC 51 appears even when the collision
did not result in SRS airbag assembly deployment, the
DTC 51 may have been set erroneously.
3. In case the DTC 51 appears without any deformation
caused by front collision, the DTC may have been set
erroneously.
WARNING:
DURING SERVICE WORK, BE CAREFUL NOT TO
TAP OR SHAKE THE SRS CONTROL UNIT. ALSO,
FAILURE TO INSTALL THE SRS CONTROL UNIT TO
VEHICLE PROPERLY MAY LEAD TO MALFUNC-
TION OF THE UNIT WHEN THE STARTER SWITCH IS
TURNED TO ON. THIS MAY RESULT IN INJURY DUE
TO SUDDEN DEPLOYMENT OF SRS AIRBAG.
SRS CONTROL UNIT
AIRBAG
SRS COIL
ASSEMBLY
1
2
2
1
0.5
Y
0.5
Y/B
8
7
N9A0076E
Step
Action
Value
YES
NO
1
Has the “SRS system check” been per-
formed?
—
Go to “SRS sys-
tem check”.
9C-46 SRS CONTROL SYSTEM
2
Turn the starter switch to OFF.
Is the airbag assembly deployed?
—
Inspect according
to “repair and
inspection
required after col-
lision” in this sec-
tion. Clear the
DTC. Perform
“SRS system
check”.
3
Check front area of the vehicle for deforma-
tion caused by front collision.
Is any deformation found?
—
Replace the parts,
and inspect
according to
“repair and
inspection
required after col-
lision” in this sec-
tion. Clear the
DTC. Perform
“SRS system
check”.
Turn the starter
switch to OFF.
Replace the SRS
control unit.
Reconnect all the
SRS system
parts, and check
that those are
installed properly.
Perform “SRS
system check”.
Step
Action
Value
YES
NO
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