Isuzu Trooper (2000 year). Manual — part 534
9J1–31
RESTRAINT CONTROL SYSTEM
DTC 25 Driver Deployment Loop Short To Ignition
CAUTION: When DTC 25 has been set, it is necessary to replace the SDM. Setting DTC 25 will also cause DTC
71 to set. When a scan tool “CLEAR CODES” command is issued and the malfunction is no longer present,
DTC 71 will remain current. Ensure that the short to voltage condition is repaired prior to installing a
replacement SDM to avoid damaging the SDM.
Step
Action
Yes
No
1
Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
2
1. When measurements are requested in this chart use J–39200
DVM with correct terminal adapter from J–35616–A.
Ignition switch “OFF.”
Connect scan tool data link connector. follow directions as
given in the scan tool operator’s manual.
2. Ignition switch “ON.”
3. Read driver sense LO .
Is driver sense LO more than 3.5 volts?
Go to Step 3
Go to Chart A
3
1. Ignition switch “OFF.”
2. Disconnect SRS coil assembly yellow 2–pin connector at the
base of the steering column. leave passenger air bag
assembly connected.
3. Connect SRS driver /passenger load tool J–41433 and
appropriate adapter to SRS coil assembly harness connector.
4. Ignition switch “ON.”
Is driver sense LO more than 3.5 volts?
Go to Step 4
Go to Step 6
4
1. Ignition switch “OFF.”
2. Disconnect SDM.
3. Disconnect SRS driver /passenger load tool.
4. Measure resistance on SDM harness connector “3” to terminal
“12” (ignition).
Does J–39200 display “OL” (infinite)?
Go to Step 5
Replace SRS
harness
Go to Step 7
5
Measure resistance on SDM harness connector from terminal “4”
to terminal “12” (ignition).
Does J–39200 display “OL” (infinite)?
Go to Chart A
Replace SRS
harness
Go to Step 7
6
1. Ignition switch “OFF.”
2. Disconnect SRS driver / passenger load tool J–41433 and
appropriate adapter J–35616–A to driver air bag assembly
harness 2-pin connector located at top of the steering column.
3. Reconnect SRS coil assembly harness connector as the base
of steering column.
4. Ignition switch “ON.”
Is driver sense LO more than 3.5 volts?
Ignition switch
“OFF”
Replace SRS coil
assembly
Go to Step 7
Ignition switch
“OFF”
Replace driver air
bag assembly
Go to Step 7
7
1. Reconnect all components, ensure all component are properly
mounted.
2. Ignition switch “ON.”
Is passenger senslo less than 3.5 volts?
Ignition switch
“OFF”
Replace SDM
Go to Step 8
Go to Chart A
8
1. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Go to the “SRS
Diagnostic
System Check”
Go to Step 8
RESTRAINT CONTROL SYSTEM
9J1–32
DTC 26 Driver Deployment Loop Open
D09RW001
Circuit Description:
When the ignition switch is turned “ON”, the SDM 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.
During “Continuous Monitoring” diagnostics, a fixed
amount of current is following in the deployment loop.
This produces proportional voltage drops in the loop. By
monitoring the voltage difference between “Driver Bag
High” and “Driver Bag Low”, the SDM calculates the
combined resistance of the driver air bag assembly, SRS
coil assembly, harness wiring CKTs IB05–YEL and
IB06–YEL/BLK, and connector terminal contact.
DTC Will Set When:
The voltage difference between “Driver Bag High”
terminal “3” and “Driver Bag Low” terminal “4” is above or
equal to a specified value for 500 milliseconds during
“Continuous Monitoring”.
Action Taken:
SDM turns “ON” the “AIR BAG” warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
The voltage difference between “Driver Bag High”
terminal “3” and “Driver Bag Low” terminal “4” is below a
specified value for 500 milliseconds during “Continuous
Monitoring”.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in
the SDM.
3. This test verifies proper connection of the yellow
2–pin connector at the base of the steering column.
4. This test checks for proper contact and/or corrosion
of the yellow 2–pin connector at the base of the
steering column.
5. This test isolates the malfunction to one side of the
SRS coil assembly yellow 2–pin connector located
at the base of steering column.
6. This test determines whether the open is in the
wiring.
7. 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 poor
connection at the driver air bag assembly harness 2–pin
connector terminals “1” and “2” at the top of the steering
column, SRS coil assembly harness 2–pin connection
terminals “1” and “2”, SDM terminals “3” and “4”, or an
open in CKTs IB05–YEL and IB06–YEL/BLK.
9J1–33
RESTRAINT CONTROL SYSTEM
DTC 26 Driver Deployment Loop Open
Step
Action
Yes
No
1
Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
2
1. When measurements are requested in this chart use J-39200
DVM with correct terminal adapter from J–35616–A.
2. use scan tool data list function, read and record the driver
differential voltage.
Is driver VDIF more than 4 volts?
Go to Step 3
Go to Chart A
3
1. Ignition switch “OFF.”
2. Make sure the SRS coil assembly yellow 2–pin connector
located at the base of steering column is seated properly.
Is the yellow 2–pin connector connected properly?
Go to Step 4
Seat driver air
bag assembly
2–pin connector
Go to Step 8
4
1. Disconnect and inspect the SRS coil assembly yellow 2–pin
connector located base of steering column.
2. If ok, reconnect the SRS coil assembly yellow 2–pin
connector.
3. Ignition switch “ON.”
Is DTC 26 current?
Go to Step 5
Go to Step 8
5
1. Ignition switch “OFF”.
2. Disconnect SRS coil and passenger air bag assembly, yellow
2–pin connector located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver/passenger load tool J–41433 and
appropriate adapter to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch “ON.”
Is DTC 26 current?
Go to Step 6
Go to Step 7
6
1. Ignition switch “OFF.”
2. there has been an open circuit in the driver inflator deployment
loop.
3. use the high resolution ohmmeter mode of the DVM while
checking CKTS IB05–YEL and IB06–YEL/BLK, and SDM
connector terminal “3” and “4” to locate the root cause.
Was a fault found?
Replace SRS
harness
Go to Step 8
Go to Chart A
7
1. Ignition switch “OFF.”
2. Disconnect SRS driver / passenger load tool from SRS coil
assembly harness connector.
3. connect SRS driver / passenger load tool J–41433 on steering
column 2–pin connector.
4. Reconnect SRS coil assembly harness connector at the base
of steering column.
5. Ignition switch “ON.”
IS DTC 26 CURRENT?
Ignition switch
“OFF”
Replace SRS coil
assembly
Go to Step 8
Ignition switch
“OFF”
Replace driver air
bag assembly
Go to Step 8
8
1. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the “SRS
Diagnostic
System Check”
Go to Step 8
RESTRAINT CONTROL SYSTEM
9J1–34
DTC 51 Deployment Event Commanded
D09RW001
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 air bag assembly
deploying the air bags and causing 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.
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