Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1709

9J1–47

RESTRAINT CONTROL SYSTEM

DTC 51 Deployment Event Commanded

D09R100002

Circuit Description:

The Sensing and Diagnostic Module (SDM) contains a
sensing device which converts vehicle velocity changes
to an electrical signal.  The electrical signal generated is
processed by the SDM and then compared to a value
stored in memory.  When the generated signal exceeds
the stored value, the SDM will cause current to flow
through the air bag assembly deploying the air bags and
causing Diagnostic Trouble Code (DTC) 51 to set.

DTC Will Set When:

The SDM detects a frontal crash, up to 30 degrees off the
centerline of the vehicle, of  sufficient force to warrant
deployment of the air bags.

Action Taken:

SDM turns “ON” the “AIR BAG” warning lamp records
“Crash Data”, and sets a diagnostic trouble  code.

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Description:

Number(s) below refer to step number(s) on the
diagnostic chart:
2. If air bag assembly (s) has not deployed, DTC 51

may have falsely set.

3. If DTC 51 has set with no signs of frontal impact, the

diagnostic trouble code has falsely set.

RESTRAINT CONTROL SYSTEM

9J1–48

DTC 51 Deployment Event Commanded

WARNING: DURING SERVICE PROCEDURES. BE
VERY CAREFUL WHEN HANDLING A SENSING AND
DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR
JAR THE SDM. NEVER POWER UP THE SRS IF THE
SDM IS NOT PROPERLY INSTALLED ON THE
VEHICLE. ALL SDM AND MOUNTING BRACKET
FASTENERS MUST BE CAREFULLY TORQUED AND
THE ARROW MUST BE POINTING TOWARD THE

FRONT OF THE VEHICLE TO ENSURE PROPER
OPERATION OF THE SUPPLEMENTAL RESTRAINT
SYSTEM (SRS). THE SDM IF NOT PROPERLY
ATTACHED TO THE VEHICLE MAY DEPLOY THE
AIRBAG (WHICH MAY CAUSE PERSONAL INJURY)
IN CASE OF AN ACCIDENTAL POWER UP TO THE
SRS.

Step

Action

Yes

No

1

Was the “SRS Diagnostic System Check” performed?

Go to 

Step 2

Go to 

“SRS

Diagnostic

System Check.”

2

Ignition switch “OFF.”

Have air bag assemblies deployed?

Replace

components and

perform

inspections as

directed in

“repairs and

inspections

required after an

accident” in this

section.

Clear diagnostic

trouble codes.

Repeat the “SRS

Diagnostic

System Check.”

Go to 

Step 3

3

Inspect front of vehicle and undercarriage for signs of impact.

Were signs of impact found?

Replace

components and

perform

inspections as

directed in

“repairs and

inspections

required after an

accident” in this

section.

Clear diagnostic

trouble codes.

Repeat the “SRS

Diagnostic

System Check.”

Ignition switch

“OFF.”

Replace SDM.

Reconnect all

SRS system

components,

ensure all

components are

properly

mounted.Repeat

the “SRS

Diagnostic

System Check.”

9J1–49

RESTRAINT CONTROL SYSTEM

DTC 53 Deployment Commanded With Deployment Loop Fault Or Energy
Reserves Out Of Range

D09R100002

Circuit Description:

The Sensing and Diagnostic Module (SDM) contains a
sensing drive which converts vehicle velocity to an
electrical signal. The electrical signal generated is
processed by the SDM and then compared to a value
stored in memory.  When the generated signal exceeds
the stored value, the SDM will cause current to flow
through the air bag assembly deploying the air bags.
Diagnostic Trouble Code (DTC) 53 is set accompanying
with DTC 51 when a deployment occurs while an air bag
assembly circuit fault is present that could possibly result
in a no deployment situation in one or both air bag
assemblies.

DTC Will Set When:

The SDM detects a frontal crash, up to 30 degrees off the
centerline of the vehicle, of  sufficient force to warrant

deployment of the air bags and an inflator circuit fault is
present.

Action Taken:

SDM turns “ON” the “AIR BAG” warning lamp records
“Crash Data”, and sets a diagnostic trouble  code.

DTC Will Clear When:

The SDM is replaced.  If DTC 53 is set, one or more DTCs
will be set in addition to DTC 53.   Malfunction(s) setting
DTC(s) (other than DTC 71) must be repaired so that
DTC(s) will  not be set when a new SDM is installed.

DTC Chart Test Description:

Number(s) below refer to step number(s) on the
diagnostic chart:
2. If air bag assembly has not deployed, Diagnostic

Trouble Code (DTC) 53 may have falsely set.

RESTRAINT CONTROL SYSTEM

9J1–50

3. If DTC 53 has set with no signs of frontal impact, the

diagnostic trouble code has  falsely set.

DTC 53 Deployment Commanded With Deployment Loop Fault Or Energy Reserves Out Of
Range

WARNING: DURING SERVICE PROCEDURES. BE
VERY CAREFUL WHEN HANDLING A SENSING AND
DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR
JAR THE SDM. NEVER POWER UP THE SRS IF THE
SDM IS NOT PROPERLY INSTALLED ON THE
VEHICLE. ALL SDM AND MOUNTING BRACKET
FASTENERS MUST BE CAREFULLY TORQUED AND

THE ARROW MUST BE POINTING TOWARD THE
FRONT OF THE VEHICLE TO ENSURE PROPER
OPERATION OF THE SRS. THE SDM IF NOT
PROPERLY INSTALLED TO THE VEHICLE MAY
DEPLOY THE AIRBAG (WHICH MAY CAUSE
PERSONAL INJURY) IN CASE OF AN ACCIDENTAL
POWER UP TO THE SRS.

Step

Action

Yes

No

1

Was the “SRS Diagnostic System Check” performed?

Go to 

Step 2

Go to 

“SRS

Diagnostic

System Check.”

2

Ignition switch “OFF.”

Have air bag assemblies deployed?

Replace

components and

perform

inspections as

directed in

“repairs and

inspections

required after an

accident” in this

section.

Clear diagnostic

trouble codes.

Repeat the “SRS

Diagnostic

System Check.”

Go to 

Step 3

3

Inspect front of vehicle and undercarriage for signs of impact.

Were signs of impact found?

Replace

components and

perform

inspections as

directed in

“repairs and

inspections

required after an

accident” in this

section.

Clear diagnostic

trouble codes.

Repeat the “SRS

Diagnostic

System Check.”

Ignition switch

“OFF.”

Replace SDM.

Reconnect all

SRS system

components,

ensure all

components are

properly

mounted.

Repeat the “SRS

Diagnostic

System Check.”