OPEL FRONTERA 1998 Workshop Manual

RESTRAINT CONTROL SYSTEM 9J1–34
DTC 26 Driver Deployment Loop Open
StepActionYe sNo
1Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
21. When measurements are requested in this chart use
5–8840–0285–0 DVM with correct terminal adapter from
5–8840–0385–0.
2. Use scan tool data list function, read and record the driver
differential voltage.
Is driver VDIF more than 4.25 volts?
Go to Step 3Go to Chart A
31. 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
41. 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 5Go to Step 8
51. Ignition switch “OFF”.
2. Disconnect SRS coil and passenger air bag assembly, yellow
2–pin connectors located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver/passenger load tool 5–8840–2421–0 and
appropriate adapter to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch “ON.”
Is DTC 26 current?
Go to Step 6Go to Step 7
61. 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 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
71. Ignition switch “OFF.”
2. Disconnect SRS driver / passenger load tool from SRS coil
assembly harness connector.
3. Connect SRS driver / passenger load tool 5–8840–2421–0 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 8Ignition switch
“OFF”
Replace driver air
bag assembly
Go to Step 8
81. 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

9J1–35
RESTRAINT CONTROL SYSTEM
DTC 51 Air Bag Deployment Event Commanded
D09RW014
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.

RESTRAINT CONTROL SYSTEM 9J1–36
DTC 51 Air Bag 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 WHEN THE
SDM IS NOT RIGIDLY ATTACHED TO 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 COULD BE ACTIVATED WHEN POWERED WHILE
NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN
PERSONAL INJURY.
Step
ActionYe sNo
1Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
2Ignition 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 “SRS
Diagnostic
System Check”
Go to Step 3
3Inspect front of vehicle and undercarriage for sings 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
“OFF”
Replace SDM
Reconnect all
SRS system
components,
ensure all
components are
properly mounted
Repeat “SRS
Diagnostic
System Check”

9J1–37
RESTRAINT CONTROL SYSTEM
DTC 53 Deployment Commanded With Deployment Loop Fault Or Energy
Reserves Out Of Range
D09RW014
Circuit Description:
The SDM contains a sensing drive 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. DTC 53 is set accompanying with
DTC 51 when a deployment occurs while an air bag
assembly circuit fault is present that could possible 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 have not deployed, DTC 53 may
have falsely set.
3. If DTC 53 has set with no signs of frontal impact, the
diagnostic trouble code has falsely set.

RESTRAINT CONTROL SYSTEM 9J1–38
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 WHEN THE
SDM IS NOT RIGIDLY ATTACHED TO 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 COULD BE ACTIVATED WHEN POWERED WHILE
NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN
PERSONAL INJURY.
Step
ActionYe sNo
1Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
2Ignition switch “OFF.”
Have air bag assembles 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
3Inspect 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 “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”

9J1–39
RESTRAINT CONTROL SYSTEM
DTC 61 Warning Lamp Circuit Failure
D09RW014
Circuit Description:
When the ignition switch is turned “ON”, battery voltage is
applied to the “AIR BAG” warning lamp and to the “Ignition
1” input terminal “12”. The SDM responds by turning on
the “AIR BAG” warning lamp 3.5 seconds. The SDM
monitors the lamp driver output by comparing the output
state at “SRS Warning Lamp” terminal “7” to the
microprocessor commanded state. When “Ignition 1” is in
the specified value, and the output state does not match
the commanded state of the lamp driver for 500
milliseconds, DTC 61 is set.
DTC Will Set When:
“Ignition 1” voltage is in the specified value and the output
state at the “SRS Warning Lamp” terminal does not matchthe commanded state of the lamp driver for 500
milliseconds. This test is run every 100 milliseconds
during “Continuous Monitoring” tests and once per each
ignition cycle at the beginning.
Action Taken:
SDM attempts to turn “ON” the “AIR BAG” warning lamp
and sets a diagnostic trouble code.
DTC Will Clear When:
The ignition switch is turned “OFF.”
Diagnostic Aids:
Refer to Charts B and C to diagnose warning lamp circuit
malfunctions.

RESTRAINT CONTROL SYSTEM 9J1–40
DTC 61 Warning Lamp Circuit Failure
StepActionYe sNo
1Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
21. Malfunctions within the “AIR BAG” warning lamp circuitry will
set this diagnostic trouble code.
2. These malfunctions are addressed in the “SRS Diagnostic
System Check” via Chart B and Chart C.
3. Failure to properly perform the “SRS Diagnostic System
Check” may result in misdiagnosis.
4. Ignition switch “ON.”
5. Clear SRS diagnostic trouble codes.
IS DTC 61 set?
Ignition switch
“OFF”
Go to Chart ARepeat the “SRS
Diagnostic
System Check”

9J1–41
RESTRAINT CONTROL SYSTEM
DTC 71 Internal SDM Fault
D09RW014
Circuit Description:
DTC 71 is an indication of a potential internal SDM
malfunction and will set if any of the following conditions
are detected:
1) Deployment or microprocessor energy reserve failure.
2) EEPROM failure.
3) ROM failure.
4) RAM failure.
5) Calibration check sum failure.
6) Deployment switch faults.
7) Accelerometer fault.
8) Arming sensor fault.
9) Diagnostic current faults.
10) DTC 19
11 ) D T C 2 5
12) DTC 51
13) DTC 53
DTC Will Set When:
Any of the above indicated malfunctions are detected by
the SDM. The malfunctions described above are tested
mainly during “Continuous Monitoring” and some ones
run each ignition cycle.
Action Taken:
SDM turns “ON” the “AIR BAG” warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
A scan tool “Clear Codes” commanded is received by the
SDM. Some of the indicated malfunctions will only allow
the “AIR BAG” warning lamp to go out.
But when DTC 19, 25, 51, 53 are also set, SDM is
replaced.

RESTRAINT CONTROL SYSTEM 9J1–42
DTC 71 Internal SDM Fault
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 WHEN THE
SDM IS NOT RIGIDLY ATTACHED TO 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 COULD BE ACTIVATED WHEN POWERED WHILE
NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN
PERSONAL INJURY.
CAUTION: When DTC 19 or 25 has been set, it is necessary to replace the SDM. Setting DTC 19 and 25 or 51
or 53 will also cause DTC 71 to set. When a scan tool “CLEAR CODES” command is issued and the
malfunction is no longer present, DTC 51 or 53 and DTC 71 will remain current. Ensure that the short to voltage
condition DTC 19, 25 is repaired prior to installing a replacement SDM to avoid damaging the SDM.
Step
ActionYe sNo
1Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Go to the “SRS
Diagnostic
System Check”
2Note SRS “Diagnostic System Check.”
IS DTC 19 OR 25 OR 51 OR 53 ALSO SET (CURRENT OR
HISTORY)? (REFER TO NOTICE ABOVE.)Go to DTC 19 if
DTC 19 is set
Go to DTC 25 if
DTC 25 is set
Go to DTC 51 if
DTC 51 is set
Go to DTC 53 if
DTC 53 is set
Ignition switch
“OFF”
Replace SDM
Repeat the “SRS
Diagnostic
System Check”

9J1–43
RESTRAINT CONTROL SYSTEM
DTC 29 Passenger Pretensioner Loop Short To Ground
D09RW014
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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltages at “Driver Belt Low”
terminal “10” and “Passenger Belt Low” terminal “22” to
detect short to ground in the pretensioner assembly
circuits.
DTC Will Set When:
Neither of the air bag and the pretensioner belt are open.
“Ignition 1” is within the normal operating voltage range.
Once these conditions are met and the voltage at
“Passenger Belt Low” is below a specified value, DTC 29
will set. This test is run once each ignition cycle and
“Continuous Monitoring”.
Action Taken:
SDM turns “ON” the “AIR BAG” warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
This malfunction is no longer occurring and the ignition
switch is turned “OFF”.
DTC Chart Test Description:
Number(s) below refer to circled number(s) on the
diagnostic chart.
2. This test determines whether the SDM is
malfunctioning.
3. This test isolates the malfunction to one side of the
passenger pretensioner assembly yellow 2–pin
connector at the base of the passenger seat.
4. This test determines whether the malfunction is in
IB15–BLU/BLK.
5. This test determines whether the malfunction is in
IB16–BLU/ORG.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to ground in the passenger pretensioner assembly circuit.
Inspect IB15–BLU/BLK and IB16–BLU/ORG carefully for
cutting or chafing. If the wiring pigtail of the passenger
pretensioner assembly is damaged, the component must
be replaced.