flash code ISUZU KB P190 2007 Workshop Repair Manual
[x] Cancel search | Manufacturer: ISUZU, Model Year: 2007, Model line: KB P190, Model: ISUZU KB P190 2007Pages: 6020, PDF Size: 70.23 MB
Page 5716 of 6020
9A1-34 RESTRAINT CONTROL SYSTEM
DTC B0025 (Flash Code 25) Driver Air Bag Squib Circuit Short to GND
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 deployment loop voltages are
measured to ensure they are within their respective
normal voltage ranges.
The SRS control unit monitors the voltage at “Drive
r
Bag Low” terminal “13” and “Passenger Bag Low”
terminal “16” to detect shorts to ground/+B in the air bag
assembly circuits.
DTC Will Set When
“Ignition 1" is within the normal operating voltage range.
The voltage at “Driver Bag Low" is below a specified
value DTC B0025 will set.
Action Taken
The SRS control unit turns “ON” the “SRS” warning
lamp and sets a diagnostic trouble code.
DTC Will Clear When
The “Driver Bag Low" voltage comes to specified
voltage.
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ISUZU KB P190 2007
Page 5717 of 6020
RESTRAINT CONTROL SYSTEM 9A1-35
DTC Chart Test Description
Number(s) below refer to step 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 SRS coil assembly yellow 2–pin connector at the
base of the steering column.
4. This test determines whether the malfunction is in the “Driver Bag High” circuit.
5. This test determines whether the malfunction is in the “Driver Bag Low” circuit.
6. This test determines whether the malfunction is in the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids
An intermittent condition is likely to be caused by a short
to ground/+B in the driver air bag assembly circuit.
Inspect circuits “Driver Bag High” and “Driver Bag Low”
carefully for cutting or chafing.
DTC B0025 (Flash Code 25) Driver Air Bag Squib Circuit Short to GND
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 short to voltage or short to ground and open.
W as a problem found? Go to Step 3
3 1. Ignition switch is at “LOCK”.
2. Disconnect the SRS coil assembly yellow connector located at base of the steering column. Leave the passenger air bag
assembly connected.
3. Connect the SRS driver /passenger load tool 5-8840-2421-0 and appropriate adapter to the SRS coil assembly harness
connector.
4. Ignition switch is “ON”.
Is DTC B0025 current? Go to Step 4 Go to Step 6
4
1. Ignition switch is at “LOCK”.
2. Disconnect the SRS control unit.
3. Disconnect the SRS driver /passenger load tool.
4. Measure the resistance on the SRS control unit harness connector as follow.
z From terminals "14" to "3" and "23" (ground) (without the
pretensioner)
z From terminals "14" to "3" and "15" (ground) (with the
pretensioner and the passenger air bag)
z From terminals "14" to "3", "12" and "15" (ground) (with
the pretensioner and without the passenger air bag)
Does 5-8840-0366-0 display “OL” (infinite)? Go to Step 5 Replace SRS
harness.
Go to Step 7
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ISUZU KB P190 2007
Page 5719 of 6020
RESTRAINT CONTROL SYSTEM 9A1-37
DTC B0026 (Flash Code 26) Driver Air Bag 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 deployment loop voltages are
measured to ensure they are within their respective
normal voltage ranges.
The SRS control unit monitors the voltage at “Drive
r
Bag Low” terminal “13” and “Passenger Bag Low”
terminal “16” to detect shorts to ground/+B in the air bag
assembly circuits.
DTC Will Set When
“Ignition 1" is in the normal operating voltage range.
The voltage at “Driver Bag Low" is above a specified
value,
DTC B0026 will set.
Action Taken
The SRS control unit turns “ON” the “SRS” warning
lamp and sets a diagnostic trouble code.
DTC Will Clear When
The SRS control unit is replaced and the “Driver Bag
Low" voltage comes to specified voltage.
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ISUZU KB P190 2007
Page 5720 of 6020
9A1-38 RESTRAINT CONTROL SYSTEM
DTC Chart Test Description
Number(s) below refer to step 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 SRS coil assembly yellow 2–pin connector at the
base of the steering column.
4. This test determines whether the malfunction is in the “Driver Bag High” circuit.
5. This test determines whether the malfunction is in the “Driver Bag Low” circuit.
6. This test determines whether the malfunction is in the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids
An intermittent condition is likely to be caused by a short
to ground/+B in the driver air bag assembly circuit.
Inspect circuits “Driver Bag High” and “Driver Bag Low”
carefully for cutting or chafing.
DTC B0026 (Flash Code 26) Driver Air Bag 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 short to voltage or short to ground and open.
W as a problem found? Go to Step 3
3 1. Ignition switch is at “LOCK”.
2. Disconnect the SRS coil assembly yellow connector located at base of the steering column. Leave the passenger air bag
assembly connected.
3. Connect the SRS driver /passenger load tool 5-8840-2421-0 and appropriate adapter to the SRS coil assembly harness
connector.
4. Ignition switch is “ON”.
Is DTC B0026 current? Go to Step 4 Go to Step 6
4
Measure resistance on SRS control unit harness connector from
terminal “14” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (infinite)? Go to Step 5
Replace SRS
harness.
Go to Step 7
5 Measure the resistance on the SRS control unit harness
connector from terminal “13” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (infinite)? Go to Chart A Replace SRS
harness.
Go to Step 7
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ISUZU KB P190 2007
Page 5722 of 6020
9A1-40 RESTRAINT CONTROL SYSTEM
DTC B0029 (Flash Code 29) Passenger Pretensioner Squib Circuit High
Resistance
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 deployment loop voltages are
measured to ensure they are within their respective
normal voltage ranges. The SRS control unit then
proceeds with the “Resistance Measurement Test”.
“Passenger Pretensioner Low” terminal “10” is
grounded through a resister and the passenger current
source connected to “Passenger Pretensioner High”
terminal “11” allows a known amount of current to flow.
By monitoring the voltage difference between
“Passenger Pretensioner High” and “Passenger
Pretensioner Low” the SRS control unit calculates the
combined resistance of the passenger pretensione
r
assembly, harness wiring circuits “Passenger
Pretensioner High” and “Passenger Pretensioner Low”
connector terminal contact.
BACK TO CHAPTER INDEX TO MODEL INDEX
ISUZU KB P190 2007
Page 5724 of 6020
9A1-42 RESTRAINT CONTROL SYSTEM
DTC B0029 (Flash Code 29) Passenger Pretensioner Squib Circuit High Resistance
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. Check the passenger pretensioner circuit for open.
2. If the problem found, repair as necessary.
W as a problem found? Verify repair Go to Step 3
3
1. Ignition switch is at “LOCK”.
2. Make sure the passenger air bag assembly yellow connector
located at the base of the passenger seat.
Is the yellow connector connected properly? Go to Step 4 Seat passenger
pretensioner
assembly yellow connector properly.
Go to Step 7
4
1. Disconnect and inspect the passenger pretensioner assembly
yellow connector located at the base of the passenger seat.
2. If ok, reconnect the passenger pretensioner assembly
connector.
3. Ignition switch “ON”.
Is DTC B0029 current? Go to Step 5 Go to Step 7
5
1. Ignition switch is at “LOCK”.
2. Disconnect passenger pretensioner assembly, yellow
connector located at the base of the passenger seat.
3. Connect 5-8840-2421-0 SRS driver / passenger load tool and
appropriate adapters to passenger pretensioner assembly
harness connectors.
4. Ignition switch “ON”.
Is DTC B0029 Current? Go to Step 6 Ignition switch is at
“LOCK.”
Replace the passenger
pretensioner assembly.
Go to Step 7
6
1. Ignition switch is at “LOCK”.
2. There has been an increase in the total circuit resistance of
the passenger loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking circuits “Pasenger Pretensioner High” and
“Passenger Pretensioner Low”, and SRS control unit
connector terminal “11” and “10” to locate the root cause.
W as a fault found? Replace SRS
harness or repair chassis harness. Go to Step 7 Go to Chart A
7
1. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
W as This step finished? Repeat the “SRS
Diagnostic System Check” ―
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 5725 of 6020
RESTRAINT CONTROL SYSTEM 9A1-43
DTC B0031 (Flash Code 31) Passenger Pretensioner Squib Circuit Low
Resistance
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 deployment loop voltages are
measured to ensure they are within their respective
normal voltage ranges. The SRS control unit then
proceeds with the “Resistance Measurement Test”.
“Passenger Pretensioner Low” terminal “10” is
grounded through a resistor and the passenger current
source connected to “Passenger Pretensioner High”
terminal “11” allows a known amount of current to flow.
By monitoring the voltage difference between
“Passenger Pretensioner High” and “Passenger
Pretensioner Low”, the SRS control unit calculates the
combined resistance of the passenger air bag
assembly, harness wiring circuits “Passenge
r
Pretensioner High” and “Passenger Pretensioner Low”
connector terminal contact.
BACK TO CHAPTER INDEX TO MODEL INDEX
ISUZU KB P190 2007
Page 5727 of 6020
RESTRAINT CONTROL SYSTEM 9A1-45
DTC B0031 (Flash Code 31) Passenger Pretensioner Squib Circuit Low Resistance
Step Action Yes No
1 W as the “SRS Diagnostic System Check” performed?
Go to Step 2 Repeat the “SRS
Diagnostic System Check”
2
1. Check the passenger pretensioner squib circuit for short to
valtage or short to ground.
2. If the broblem found, repair as necessary.
W as a problem found? Verify repair Go to Step 3
3
1. Ignition switch is at “LOCK”.
2. Make sure the passenger air bag assembly yellow connector
located at the base of the passenger seat.
Is the yellow connector connected properly? Go to Step 4 Seat passenger
pretensioner
assembly yellow connector properly.
Go to Step 7
4
1. Disconnect and inspect the passenger air bag assembly
yellow connector located at the base of the passenger seat.
2. If ok, reconnect the passenger air bag assembly connector.
3. Ignition switch is at “ON”.
Is DTC B0031 Current? Go to Step 5 Go to Step 7
5
1. Ignition switch is at “LOCK”.
2. Disconnect SRS coil and passenger pretensioner assembly,
yellow connector located at the base of the passenger seat.
3. Connect 5-8840-2421-0 SRS driver/passenger load tool and
appropriate adapters to passenger pretensioner assembly
harness connectors.
4. Ignition switch is at “ON”.
Is DTC B0031 current? Go to Step 6 Ignition switch is at
“OFF”.
Replace the passenger
pretensioner assembly.
Go to Step 7
6
1. Ignition switch is at “LOCK”.
2. There has been a decrease in the total circuit resistance of
the passenger inflator deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while checking circuits “Passenger pretensioner High” and
“Passenger Pretensioner Low”, and SRS control unit
connector terminal “11” and “10” to locate the root cause.
W as a fault found? Replace SRS
harness or repair chassis harness. Go to Step 7 Go to Chart A
7
1. Reconnect all components, ensure all component are
properly mounted.
2. Clear diagnostic trouble codes.
W as this step finished? Repeat the “SRS
Diagnostic System Check” ―
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 5728 of 6020
9A1-46 RESTRAINT CONTROL SYSTEM
DTC B0033 (Flash Code 33) Passenger Pretensioner Squib Circuit Short to
GND
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 “Passenger Pretensioner Low " is belo
w
a specified value,
DTC B0033 will set.
Action Taken
SRS control unit turns “ON” the “SRS” warning lamp
and sets a diagnostic trouble code.
BACK TO CHAPTER INDEX TO MODEL INDEX
ISUZU KB P190 2007
Page 5729 of 6020
RESTRAINT CONTROL SYSTEM 9A1-47
DTC Will Clear When
The “Passenger 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 passenger pretensioner assembly yellow connecto
r
at the base of the passenger seat.
4. This test determines whether the malfunction is in “Passenger Pretensioner High” circuit.
5. This test determines whether the malfunction is in “Passenger Pretensioner Low” circuit.
Diagnostic Aids
An intermittent condition is likely to be caused by a short
to ground in the passenger pretensioner assembl
y
circuit. Inspect circuits “Passenger Pretensioner High”
and “Passenger Pretensioner Low” carefully for cutting
or chafing. If the wiring pigtail of the passenge
r
pretensioner assembly is damaged, the component
must be replaced. A careful inspection of “Passenge
r
Pretensioner High” and “Passenger Pretensioner Low”,
including the passenger pretensioner assembly pigtail is
essential to ensure that the replacement SRS control
unit will not be damaged.
DTC B0033 (Flash Code 33) Passenger Pretensioner Squib Circuit Short to GND
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 passenger pretensioner air bag squib circuit for short to ground.
W as a problem found? Go to Step 3
3
1. Ignition switch is at “LOCK”.
2. Disconnect passenger pretensioner assembly yellow
connector at the base of the passenger seat.
3. Leave driver air bag assembly connected.
4. Connect SRS driver / passenger load tool 5-8840-2421-0 and
appropriate adapter to passenger air bag assembly harness
connector.
5. Ignition switch is at “ON”.
Is DTC B0033 current? Go to Step 4 Ignition switch is at
“LOCK”.
Replace
passenger
pretensioner assembly .
Go to Step 6
4 1. Ignition switch is at “LOCK”.
2. Disconnect the SRS driver /passenger load tool.
3. Measure the resistance on the SRS control unit harness connector as follow.
z From terminals "11" to "3" and "15" (ground) (with the
passenger air bag)
z From terminals "11" to "3", "12" and "15" (ground)
(without the passenger air bag)
Does 5-8840-0366-0 display “OL” (Infinite)? Go to Step 5 Replace SRS
Harness.
Go to Step 6
BACK TO CHAPTER INDEX TO MODEL INDEX
ISUZU KB P190 2007