Isuzu N-Series. Service 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

9C-48 SRS CONTROL SYSTEM

Step

Action

Value

YES

NO

1

Has the “SRS system check” been per-
formed?

Go to Step2

Go to “SRS sys-

tem check”.

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”.

Go to Step3

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”.

SRS CONTROL SYSTEM 9C-49

DTC: 54 Deployment Output by Onboard Deployment System Communication

Outline

Description of Circuit
DTC 54 indicates that the SRS airbag has been de-
ployed by SRS airbag onboard deployment system.

Condition when DTC is Set
When SRS airbag has been deployed by SRS airbag
onboard deployment system.

Condition when DTC is Cleared
This DTC code cannot be cleared. Replace the SRS
control unit.

Caution:

When this DTC is set, all the SRS system parts (SRS
control unit, airbag, etc.) must be replaced. In addition,
This DTC cannot be cleared. Be sure to disconnect the
battery cable before replacement, otherwise it will result
malfunction of replaced SRS system parts or cause bat-
tery short circuit.

B

ACC

ON

ST

STARTER SWITCH

METER

AIRBAG

SRS CONTROL UNIT

DATA LINK CONNECTOR

16 15 14 13 12 11 10 9

8 7 6 5 4 3 2 1

0.5

B

0.5

GY

0.5

SB

0.5

GY

0.5

SB

16

4

19

15

18

7

8

20

6

5

0.85B

0.85B

0.5

B/R

0.5

B/R

0.5

W/R

0.5

B/R

0.5

B/R

0.5

W/R

0.5

B

1.25

B

2L

3
B/Y

2

14

3W/L

8B

3W/L

40A
KEY SW

10A
SRS

AIRBAG

SRS COIL

ASSEMBLY

1

2

2

1

0.5

Y

0.5

Y/B

3

10A
METER

0.5
B/Y

18

OFF

N9A0086E

Step

Action

Value

YES

NO

1

Has the “SRS system check” been per-
formed?

Go to Step2

Go to “SRS sys-

tem check”.

2

Is the DTC 54 detected?

Go to Step3

Go to Step1

9C-50 SRS CONTROL SYSTEM

3

Replace the SRS system parts.

Is the procedure completed?

Check the repair.

Step

Action

Value

YES

NO

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Текст

Политика конфиденциальности