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Isuzu N-Series. Manual - part 1200
SRS CONTROL SYSTEM 9C-47
DTC: 53 Specific Trouble when 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 airbag assembly for deployment, and set the DTC
53 and 51.
Condition when DTC is Set
When the SRS control unit detects the front collision
over certain degree of impact.
Action to be Taken
SRS control unit turns the “SRS” warning lamp ON,
record the “collision data”, and set the DTC.
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 53 appears even when the collision
did not result in SRS airbag assembly deployment, the
DTC 53 may have been set erroneously.
3. In case the DTC 53 appears without any deformation
caused by front collision, the DTC may have been set
erroneously.
Point of Diagnosis
When the DTC 53 is set, more than one DTC is added
to be set. The function faults which set the DTCs (expect
DTC 71) must be corrected before new SRS control unit
installation, in order to prevent the DTCs to be set again.
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