1998 OPEL FRONTERA ignition

RESTRAINT CONTROL SYSTEM 9J1–32
DTC 25 Driver Deployment Loop Short To B+
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 B+ condition 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”
21. When measurements are requested in this chart use
5–8840–0285–0 DVM with correct terminal adapter from
5–8840–0385–0.
2. Ignition switch “OFF.”
3. Connect scan tool data link connector. follow directions as
given in the scan tool operator’s manual.
4. Ignition switch “ON.”
5. Read driver bag sense LO .
Is driver bag sense LO more than 3.5 volts?
Go to Step 3Go to Chart A
31. 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 5–8840–2421–0 and
appropriate adapter to SRS coil assembly harness connector.
4. Ignition switch “ON.”
Is driver bag sense LO more than 3.5 volts?
Go to Step 4Go to Step 6
41. 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 5–8840–0285–0 display “OL” (infinite)?
Go to Step 5
Replace SRS
harness
Go to Step 7
5Measure resistance on SDM harness connector from terminal “4”
to terminal “12” (ignition).
Does 5–8840–0285–0 display “OL” (infinite)?
Go to Chart A
Replace SRS
harness
Go to Step 7
61. Ignition switch “OFF”
2. Connect SRS driver / passenger load tool 5–8840–2421–0
and appropriate adapter 5–8840–0385–0 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 bag sense LO more than 3.5 volts?
Ignition switch
“OFF”
Replace SRS coil
assembly
Go to Step 7Ignition switch
“OFF”
Replace driver air
bag assembly
Go to Step 7
71. Reconnect all components, ensure all component are properly
mounted.
2. Ignition switch “ON.”
Is driver bag senslo less than 3.5 volts?Ignition switch
“OFF”
Replace SDM
Go to Step 8
Go to Chart A
81. 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

9J1–33
RESTRAINT CONTROL SYSTEM
DTC 26 Driver Deployment Loop Open
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
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 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 aspecified 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 IB05–YEL and IB06–YEL/BLK.

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

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”

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.