Isuzu KB P190. Manual - part 1436

9A1-62  RESTRAINT CONTROL SYSTEM 

 

DTC B0051 (Flash Code 51) Air Bag Squib Circuit Activated (Crash) 

 
 

 

 

RTW79ALF000301 

 

Circuit Description 

The SRS control unit contains a sensor which converts
vehicle velocity changes to an electrical signal. The
electrical signal generated is processed by the SRS
control unit and then compared to a value stored in
memory. When the generated signal exceeds the
stored value, the SRS control unit will cause current to
flow through the air bag assembly deploying the air
bags and causing DTC B0051 to set.  

 

DTC Will Set When 

The SRS control unit 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 

SRS control unit turns “ON” the “SRS” warning lamp 
and records “Crash Data”, and sets a diagnostic trouble 
code.  

 

DTC Will Clear When 

The SRS control unit is replaced.  

 

DTC Chart Test Description 

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

B0051 may have been falsely set. 

3.  If DTC B0051 has set with no signs of frontal impact, 

the diagnostic trouble code has been falsely set. 

RESTRAINT CONTROL SYSTEM  9A1-63 

 

DTC B0051 (Flash Code 51) Air Bag Squib Circuit Activated (Crash) 

WARNING:  DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SRS CONROL UNIT.  
NEVER STRIKE OR JAR THE SRS CONTROL UNIT.  NEVER POWER UP THE SRS WHEN THE SRS CONTROL 
UNIT IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SRS CONTROL UNIT 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 SRS CONTROL UNIT COULD BE 
ACTIVATED AND CAUSE DEPLOYMENT RESULTING IN PERSONAL INJURY. 
 

Step Action 

Yes 

No 

1 

Was the “SRS Diagnostic System Check” performed? 

Go to Step 2. 

Go to the “SRS 

Diagnostic System 

Check” 

2 

Ignition switch is at “LOCK”. 
Have air bag assemblies been deployed? 

Replace 

components and 

perform 

inspections as 

directed in “repairs 

and inspections 

required after an 

accident” in this 

section. 

clear diagnostic 

trouble codes. 

Repeat “SRS 

Diagnostic System 

Check” 

Go to Step 3 

3 

Inspect the front of the 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 “SRS 

Diagnostic System 

Check” 

Ignition switch 

“LOCK”. 

Replace SRS 

control unit. 

Reconnect all SRS 

system 

components, 

ensure all 

components are 

properly mounted.

Repeat “SRS 

Diagnostic System 

Check” 

 

9A1-64  RESTRAINT CONTROL SYSTEM 

 

DTC B0052 (Flash Code 52) Pretensioner Squib Circuit Activated (Crushed) 

 
 

 

 

RTW79ALF000301 

 

Circuit Description 

The 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 pretensioner
seat belt deploying the pretensioner seat belt and 
causing DTC B0052 to set. 
 

DTC Will Set When 

The SRS control unit detects a frontal crash, up to 30
degrees off the centerline of the vehicle, of sufficient
force to warrant deployment of the pretensioner seat
belt. 
 

 

Action Taken 

SRS control unit turns “ON” the “SRS” warning lamp 
and records “Crash Data”, and sets a diagnostic trouble 
code. 
 

DTC Will Clear When 

The SRS control unit is replaced. 
 

DTC Chart Test Description 

Number(s) below refer to step number(s) on the 
diagnostic chart: 
2. If the pretensioner seat belt assemblies have not 

deployed, DTC B0052 may have been falsely set. 

3.  If DTC B0052 has set with no signs of frontal impact, 

the diagnostic trouble code has been falsely set. 

RESTRAINT CONTROL SYSTEM  9A1-65 

 

DTC B0052 (Flash Code 52) Pretensioner Squib Circuit Activated (Crash) 

WARNING:  DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SRS CONROL UNIT.  
NEVER STRIKE OR JAR THE SRS CONTROL UNIT.  NEVER POWER UP THE SRS WHEN THE SRS CONTROL 
UNIT IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SRS CONTROL UNIT 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 SRS CONTROL UNIT COULD BE 
ACTIVATED AND CAUSE DEPLOYMENT AND RESULTING IN PERSONAL INJURY. 
 

Step Action 

Yes 

No 

1  

Was the “SRS Diagnostic System Check” performed? 

Go to Step 2. 

Go to the “SRS 

Diagnostic System 

Check”  

2  

Ignition switch “LOCK”. 
Have the pretensioner seat belt assemblies been deployed? 

Replace 

components and 

perform 

inspections as 

directed  in 

“repairs and 

inspections 

required  after an 

accident” in this 

section. 

clear diagnostic 

trouble codes. 

Repeat “SRS 

Diagnostic System 

Check” 

Go to Step 3 

3  

Inspect the front of the 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 “SRS 

Diagnostic System 

Check” 

Ignition switch is at 

“LOCK”. 

Replace SRS 

control unit. 

Reconnect all SRS 

system 

components, 

ensure all 

components  are 

properly mounted.

Repeat “SRS 

Diagnostic System 

Check”