Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service 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.”
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