ISUZU KB P190 2007 Workshop Repair Manual

RESTRAINT CONTROL SYSTEM 9A1-59

Step Action Yes No
5 Measure the resistance on the SRS control unit harness
connector as follow.
z From terminals "7" to "3" and "15" (ground) (with the
passenger air bag)
z From terminals "7" to "3", "12" and "15" (ground) (without
the passenger air bag)
Does 5-8840-0366-0 display “OL” (Infinite)? Go to Chart A Replace SRS
Harness.
Go to Step 6
6 1. Reconnect all the components and ensure all components
are properly mounted.
2. Clear diagnostic trouble codes.
Is this step finished? Go to the “SRS
Diagnostic system Check” ―



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ISUZU KB P190 2007

9A1-60 RESTRAINT CONTROL SYSTEM

DTC B0046 (Flash Code 46) Driver Pretensioner Squib Circuit Short to Battery
Voltage



RTW 79ALF000301

Circuit Description
W hen the ignition switch is turned “ON”, the SRS
control unit will perform tests to diagnose critical
malfunctions within itself. Upon passing these tests,
“Ignition 1”, and pretensioner loop voltages are
measured to ensure they are within their respective
normal voltage ranges.
The SRS control unit monitors the voltages at “Drive
r
Pretensioner Low” terminal “7” and “Passenger
Pretensioner Low” terminal “10” to detect short to
ground/+B in the pretensioner assembly circuits.

DTC Will Set When
“Ignition 1" is in the normal operating voltage range.
The voltage at “Driver Pretensioner Low " is above a
specified value,
DTC B0046 will set.

Action Taken
SRS control unit turns “ON” the “SRS” warning lamp
and sets a diagnostic trouble code.

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ISUZU KB P190 2007

RESTRAINT CONTROL SYSTEM 9A1-61

DTC Will Clear When
The “Driver Pretensioner Low " voltage comes to
specified voltage.

DTC Chart Test Description
Number(s) below refer to circled number(s) on the
diagnostic chart.
2. This test determines whether the SRS control unit is malfunctioning.
3. This test isolates the malfunction to one side of the driver pretensioner assembly yellow connector at the
base of the driver seat.
4. This test determines whether the malfunction is in “Driver Pretensioner High” circuit.
5. This test determines whether the malfunction is in “Driver Pretensioner Low” circuit.

Diagnostic Aids
An intermittent condition is likely to be caused by a short
to +B in the driver pretensioner assembly circuit.
Inspect circuits “Driver Pretensioner High” and “Drive
r
Pretensioner Low” carefully for cutting or chafing. If the
wiring pigtail of the driver pretensioner assembly is
damaged, the component must be replaced. A careful
inspection of “Driver Pretensioner High” and “Drive
r
Pretensioner Low”, including the driver pretensione
r
assembly pgtail is essential to ensure that the
replacement SRS control unit will not be damaged.


DTC B0046 (Flash Code 46) Driver Pretensioner Squib Circuit Short to Battery Voltage

Step Action Yes No
1 W as the “SRS Diagnostic System Check” performed? Go to Step 2 Go to the “SRS
Diagnostic System Check”
2 1. W hen measurements are requested in this chart use a 5-
8840-0366-0 DMM with a correct terminal adapter from 5-
8840-2835-0.
2. Ignition switch is at “LOCK”.
3. Ignition switch is “ON”.
4. Check the driver air bag squib circuit for a short to voltage.
W as a problem found? Go to Step 3

3
1. Ignition switch is at “LOCK”.
2. Disconnect driver pretensioner assembly yellow connector at
the base of the driver seat.
3. Leave driver air bag assembly connected.
4. Connect SRS driver / passenger load tool 5-8840-2421-0 and
appropriate adapter to driver air bag assembly harness
connector.
5. Ignition switch is at “ON”.
Is DTC B0046 current? Go to Step 4 Ignition switch is at
“LOCK.”
Replace driver pretensioner assembly .
Go to Step 6
4 Measure the resistance on the SRS control unit harness
connector from terminal “8” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (Infinite)? Go to Step 5 Replace SRS
Harness.
Go to Step 6
5 Measure the resistance on the SRS control unit harness connector from terminal “7” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (Infinite)? Go to Chart A Replace SRS
Harness.
Go to Step 6
6 1. Reconnect all the components and ensure all components
are properly mounted.
2. Clear diagnostic trouble codes.
Is this step finished? Go to the “SRS
Diagnostic system Check” ―



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ISUZU KB P190 2007

9A1-62 RESTRAINT CONTROL SYSTEM

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



RTW 79ALF000301

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. W hen the generated signal exceeds the
stored value, the SRS control unit will cause current to
flow through the air bag assembly deploying the ai
r
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.

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ISUZU KB P190 2007

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 W as 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.
W ere 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”


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ISUZU KB P190 2007

9A1-64 RESTRAINT CONTROL SYSTEM

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



RTW 79ALF000301

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. W hen
the generated signal exceeds the stored value, the
SDM will cause current to flow through the pretensione
r
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.

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ISUZU KB P190 2007

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 W as 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.
W ere 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”


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ISUZU KB P190 2007

9A1-66 RESTRAINT CONTROL SYSTEM

DTC B0055 (Flash Code 55) Vehicle Variant Missing



RTW 79ALF000301



Circuit Description
DTC B0055 will be set, if either the SRS control unit or
the SRS control unit harness is not genuine parts.
The correct conditions of terminals on the SRS control
unit and the SRS harness are as follows.

Terminal No. 12 15 23 26
W ithout
Pretensioner - - used -
W ith Pretensioner - used - -
W ith Pretensioner
and W ithout
Passenger Air Bg used used - -


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ISUZU KB P190 2007

RESTRAINT CONTROL SYSTEM 9A1-67


Step Action Yes No
1 W as the “SRS Diagnostic System Check” performed? Go to Step 2 Go to the “SRS
Diagnostic System Check”
2 1. Ignition switch is at “LOCK”.
2. Disconnect the SRS control unit.
3. Inspect the SRS control unit harness for the following condition.
z W ithout the pretensioner:
- The wiring harness is not connected on terminal "23"
- The wiring harness is connected on terminals "12", "15" and "26"
z W ith the pretensioner:
- The wiring harness is not connected on terminal "15"
- The wiring harness is connected on terminals "12", "23" and "26"
z W ithout the pretensioner and without the passenger air
bag:
- The wiring harness is not connected on terminals "12" and "15"
- The wiring harness is connected on terminals "23" and "26"
W as a problem found? Replace the SRS
control unit harness.
Go to Step 3 Replace the SRS
control unit.
Go to Step 3
3 1. Reconnect all components and ensure all components are
properly mounted.
2. Clear the diagnostic trouble codes.
Is this step finished? Go to the “SRS
Diagnostic System Check” ―



DTC Will Set When
z W ithout the pretensioner:
Terminals "12", "15" and "26" are shorted to
ground.
Terminal "23" is open (harness is not connected).
z W ith the pretensioner:
Terminals "12", "23" and "26" are shorted to
ground.
Terminal "15" is open (harness is not connected).
z W ith the pretensioner and without the passenge
r
air bag:
Terminals "23" and "26" are shorted to ground.
Terminals "12" and "15" are open (harness is not
connected).
It is DTC set, if non genuine SRS control unit is installed
with the SRS harness genuine part, or incase o
f
terminal "12", "15", "23" and "26" are abnormal
condition with the SRS control unit genuine part.

Action Taken
The SRS control unit turns “ON" the “SRS" warning
lamp and sets a DTC B0055.
But if there is abnormal condition with the SRS control
unit and/or SRS harness, the DTC is not set.

DTC Will Clear When
DTC B0055 can be cleared only by using the scan tool.

Diagnostic Aids
Ensure that terminal "12" is shorted to ground on the
SRS harness. Terminal "15", "23" and "26" are open
circuit.
DTC B0055 (Flash Code 55) Vehicle Variant Missing

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ISUZU KB P190 2007

9A1-68 RESTRAINT CONTROL SYSTEM

DTC B0061 (Flash Code 61) Warning Lamp Circuit Failure



RTW 79ALF000301

Circuit Description
W hen the ignition switch is first turned “ON”, “Ignition 1”
voltage is applied from the “METER” fuse to the “SRS”
warning lamp which is connected to “SRS" warning
lamp, terminal “4”. The “SRS” fuse applies system
voltage to the “Ignition 1” inputs, terminal “1”. The SRS
control unit responds by flashing the “SRS” warning
lamp 7 times. The SRS control unit monitors the “SRS
W arning Lamp" terminal "4" for conditions that are
incorrect for the commanded state of the "SRS" warning
lamp.
For example, a failure condition exists if the SRS
control unit detects low voltage when the "SRS" warning
lamp is commanded OFF, or high voltage when the
"SRS" warning lamp is commanded ON. If the SRS
control unit detects an improper voltage on the “SRS
W arning Lamp" terminal "4", DTC B0061 will set.
DTC Will Set When
The SRS control unit try to turn "ON" the "SRS" warning
lamp but the battery voltage is not supplied to terminal
"4".
The SRS control unit try to turn "OFF" the "SRS"
warning lamp but the battery voltage is supplied to
terminal "4".

Action Taken
If circuits of the “SRS" warning lamp power supply and
ground are normal condition, the SRS control unit turns
“ON” the “SRS” warning lamp and sets a diagnostic
trouble code.


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ISUZU KB P190 2007