1998 OPEL FRONTERA direction

SUPPLEMENTAL RESTRAINT SYSTEM 9J–40
3. Disconnect the yellow 2–pin connector located
behind the air bag assembly and remove air bag
assembly.Refer to “SRS Connectors” in this section
for removal and installation.
4. Disconnect horn lead connector.
827RT009
5. Remove the steering wheel attachment nut.
6. Apply a setting mark across the steering wheel and
shaft so parts can be reassembled in their original
position.
430RS004
7. Move the tires to the straight ahead position before
removing the steering wheel and remove wheel with
5–8521–0016–0.
430RT009
8. Feed wiring though the wheel and remove wheel.
9. Remove the steering lower cover and engine hood
opening lever.
10. Remove the driver knee bolster assembly.
11. Remove the steering column cover.
12. Remove air conditioning lower duct.
13. Disconnect the 12–pin wiring harness connectors
located at the base of steering column.
CAUTION: Never apply force to the steering wheel
in the direction of the shaft by using a hammer or
other impact tools in an attempt to remove the
steering wheel. The steering shaft is designed as an
energy absorbing unit.
14. Remove the combination switch assembly with SRS
coil.

SUPPLEMENTAL RESTRAINT SYSTEM9J–45
3. Disconnect the yellow 2–pin connector located
behind the air bag assembly and remove air bag
assembly.Refer to “SRS Connectors” in this section
for removal and installation.
827RT009
4. Disconnect horn lead connector.
5. Remove the steering wheel attachment nut.
6. Apply a setting mark across the steering wheel and
shaft so parts can be reassembled in their original
position.
430RS004
7. Move the tires to the straight ahead position before
removing the steering wheel and removing wheel with
5–8521–0016–0.
430RT009
8. Feed wiring though the wheel and remove wheel.
9. Remove the steering lower cover and engine hood
opening lever.
10. Remove the driver knee bolster assembly.
740RT015
11. Remove the steering column cover.
12. Remove air conditioning lower duct.
13. Disconnect the wiring harness connectors located at
the base of steering column.
CAUTION: Never apply force to the steering wheel
in direction of the shaft by using a hammer or other
impact tools in an attempt to remove the steering
wheel. The steering shaft is designed as an energy
absorbing unit.
14. Remove the combination switch assembly with SRS
coil.

RESTRAINT CONTROL SYSTEM 9J1–2
Diagnostic Information
CAUTION: When fasteners are removed, always
reinstall them at the same location from which they
were removed. if a fastener needs to be replaced, use
the correct part number fastener for that application.
if the correct part number fastener is not available, a
fastener of equal size and strength (or stronger) may
be used. fasteners that are not reused, and those
requiring thread locking compound will be called
out. the correct torque value must be used when
installing fasteners that require it. if the above
conditions are not followed, parts or system damage
could result.
Diagnostic Procedures
WARNING: TO AVOID DEPLOYMENT WHEN
TROUBLESHOOTING THE SRS, DO NOT USE
ELECTRICAL TEST EQUIPMENT SUCH AS A
BATTERY–POWERED OR AC–POWERED
VOLTMETER, OHMMETER, ETC., OR ANY TYPE OF
ELECTRICAL EQUIPMENT OTHER THAN THAT
SPECIFIED IN THIS MANUAL. DO NOT USE A NON
POWERED, PROBE–TYPE TESTER.
INSTRUCTIONS IN THIS MANUAL MUST BE
FOLLOWED CAREFULLY, OTHERWISE PERSONAL
INJURY MAY RESULT.
The diagnostic procedures used in this section are
designed to aid in finding and repairing SRS problems.
Outlined below are the steps to find and repair SRS
problems quickly and effectively. Failure to carefully
follow these procedures may result in extended
diagnostic time, incorrect diagnosis and incorrect parts
replacement.
1.Perform The “SRS Diagnostic System Check”.
The “SRS Diagnostic System Check” should always
be the starting point of any SRS diagnostics. The
“SRS Diagnostic System Check” checks for proper
“AIR BAG” warning lamp operation and checks for
SRS trouble codes using both “Flash Code” and
“Scan Tool” Methods.
2.Refer To The Proper Diagnostic Chart As Directed
By The “SRS Diagnostic System Check”.
The “SRS Diagnostic System Check” will lead you to
the correct chart to diagnose any SRS problems.
Bypassing these procedures may result in extended
diagnostic time, incorrect diagnosis and incorrect
parts replacement.
3.Repeat The “SRS Diagnostic System Check”
After Any Repair Or Diagnostic Procedures Have
Been Performed.
Preforming the “SRS Diagnostic System Check” after
all repair or diagnostic procedures will assure that the
repair has been made correctly and that no other
conditions exist.
Diagnostic Codes
The Sensing and Diagnostic Module (SDM) maintains a
history record of all diagnostic codes that have beendetected since the SRS codes were last cleared during
service.
1. Active Codes — Faults that are presently detected
this ignition cycle. Active codes are stored in RAM
(Random Access Memory).
2. History Codes — All faults detected since the last
time the history fault memory was cleared. History
codes are stored in EEPROM. (Electronically
Erasable Programmable Read only Memory)
How To Read Trouble Codes
All codes (Active and history) can be read (or cleared) by
using a scan tool or equivalent.
If a PDT is not available, have the vehicle serviced by
ISUZU dealer.
How To Clear Trouble Codes
Trouble codes can only be cleared by using a Scan Tool.
If a “scan tool” is not available then inform the owner of the
stored codes and suggest that the codes are cleared
upon the next visit to an Isuzu dealership.
Scan Tool Diagnostics
A scan tool can be used to read current and history codes
and to clear all history codes after a repair is complete.
The scan tool must be updated to communicate with the
SRS through a memory card or a manufacturer’s update
before it can be used for SRS diagnostics. To use the
scan tool, connect it to the DLC connector and turn the
ignition switch “ON”. Then follow the manufacturer’s
directions for communication with the SRS. The scan tool
reads serial data from the SDM “Serial Data” output
(terminal 24) to the DLC connector (terminal 9).
Basic Knowledge Required
Before using this section of the Service Manual, there is
some basic knowledge which will be required. Without
this knowledge, you will have trouble using the diagnostic
procedures in this section. Use care to prevent harm or
unwanted deployment. Read all cautions in the service
manual and on warning labels attached to SRS
components.
Basic Electrical Circuits
You should understand the basic theory of electricity
including series and parallel circuits, and understand the
voltage drops across series resistors. You should know
the meaning of voltage (volts), current (amps), and
resistance (ohms). You should understand what happens
in a circuit with an open or a shorted wire. You should be
able to read and understand a wiring diagram.
“Flash Code” Diagnostics
Flash code diagnostics can be used to read active codes
and to determine if history codes are present but cannot
be used to clear codes or read history codes. Flash code
diagnostics is enabled by grounding by terminal 4
shorting to terminal 13 of the DLC connector with the
ignition switch “ON”. Grounding terminal 4 of the DLC
connector pulls the “Diagnostics Request” input (Terminal
1) of the SDM low and signals the SDM to enter the flash
code diagnostic display mode.

9J1–5
RESTRAINT CONTROL SYSTEM
diagnostic trouble codes in the order specified may result in extended diagnostic time, incorrect diagnosis and
incorrect parts replacement.
SRS Diagnostic System Check
StepActionYe sNo
1Note the “Air Bag” warning lamp as ignition switch is turned “ON.”
Does the “AIR BAG” warning lamp turn on 3.5 seconds?
Go to Step 2Go to Step 3
2Note the “AIR BAG” warning lamp after it turn on 3.5 seconds.
Does the “AIR BAG” warning lamp go “OFF”?
Go to Step 4Go to Step 5
3Note the “AIR BAG” warning lamp as ignition switch is turned
“ON”.
Does the “AIR BAG” warning lamp come “ON” steady?
Go to Chart BGo to Chart C
41. Note the “AIR BAG” warning lamp as that ignition switch is
turned “ON.”
Ignition switch “OFF.”
2. Connect a scan tool to data link connector.
3. Follow direction given in the scan tool instruction manual.
Ignition switch “ON.”
4. Request the SRS diagnostic trouble code display, recode all
history diagnostic trouble code(s). specify as such, on repair
order
Is (are) diagnostic trouble code(s) displayed?Ignition switch
“OFF”
When DTC 71 is
set, go to DTC 71
Chart
For all other
history codes
refer to
“Diagnostic Aids”
For that specific
DTC
A history DTC
indicates the
malfunction has
been repaired or
is intermittent
SRS is functional
and free of
malfuncitons, no
further diagnosis
is required
If scan tool
indicated “NO
DATA
RECEIVED,”
refer to chassis
electrical section8
51. Ignition switch “OFF.”
2. Connect a scan tool to data link connector.
3. Follow directions as given in the scan tool instruction manual.
4. Ignition switch “ON.”
5. Request the SRS diagnostic trouble code display, Recode all
diagnostic trouble code(s), specifying as current or history on
repair order.
Is (are) diagnostic trouble code (s) displayed?Ignition switch
“OFF”
When DTC 53 is
set, go to DTC 53
chart
When DTC 51 is
set, go to DTC 51
chart
When DTC 19 is
set, go to DTC 19
chart
When DTC 25 is
set, go to DTC 25
chart
Diagnose
remaining current
DTCs from
lowest to highest
When only history
DTCs exist, refer
to “Diagnostics
Aids” for that
specific DTC
A history DTC
indicates the
malfunction has
been repaired or
is intermittent
If scan tool
indicates “No
Data Received,”
refer to chassis
electrical section8

9J1–9
RESTRAINT CONTROL SYSTEM
Chart B “AIR BAG” warning lamp comes “ON” Steady
StepActionYe sNo
11. 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 to data link connector, follow directions as
given in the scan tool instruction MANUAL.
4. Ignition switch “ON.”
5. Request SRS diagnostic trouble code display.
Dose scan tool indicate “No Data Received”?
Go to Step 2Go to Step 3
21. Ignition switch “OFF”.
2. Inspect SDM harness connector connection to SDM.
Is it securely connected to the SDM?
Ignition switch
“OFF”
Replace SDM
Go to Step 5
Connect SDM
securely to
de–activate
shorting clip in
SDM harness
connector
Go to Step 5
3Using scan tool, request SRS data list.
Is “ignition” less than 9 volts?
Go to Step 4
Ignition switch
“OFF”
Replace SDM
Go to Step 5
41. Ignition switch “OFF.”
2. Disconnect SRS coil and passenger air bag assemblies.
yellow 2–pin connector located at base of steering column and
behind the glove box assembly.
Disconnect SDM.
3. Disconnect the connector of “SRS Warning Lamp” of
instrument cluster.
4. Measure resistance from SDM harness connector terminal “7”
to ground “6”.
Does 5–8840–0285–0 display “OL” (Infinite)?
Go to Chart A
Replace SRS
harness
Go to Step 5
5Reconnect all SRS components, ensure all components are
properly mounted.
Was this step finished?Repeat the “SRS
Diagnostic
System Check”
Go to Step 5

RESTRAINT CONTROL SYSTEM 9J1–20
DTC 18 Passenger Deployment Loop Short To Ground
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. 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 passenger bag sense LO.
Is passenger bag sense LO less than 1.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch “OFF.”
2. Disconnect passenger air bag assembly yellow 2–pin
connector behind the glove box assembly.
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 “ON.”
Is DTC 18 current?
Go to Step 4
Ignition switch
“OFF”
Replace
passenger air
bag assembly
Go to Step 6
41. Ignition switch “OFF”.
2. Disconnect SRS driver / passenger load tool
3. Measure resistance on SDM harness connector from terminal
“15” to terminal “16” (ground).
Does 5–8840–0285–0 display “OL” (Infinite)?
Go to Step 5
Replace SRS
Harness
Go to Step 6
5Measure resistance on SDM harness connector from terminal
“16” to terminal “6” (ground).
Does 5–8840–0285–0 display “OL” (Infinite)?
Go to Chart A
Replace SRS
Harness.
Go to Step 6
61. Reconnect all components and 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 6

RESTRAINT CONTROL SYSTEM 9J1–22
DTC 19 Passenger Deployment Loop Short To B+
CAUTION: When DTC 19 has been set, it is necessary to replace the SDM. Setting DTC 19 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
ActionYe sNo
1Perform the “SRS Diagnostic System Check”
Was the “SRS Diagnostic System Check” performed?
Go to Step 2
Repeat 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 passenger bag sense LO.
Is passenger bag sense LO more than 3.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch “OFF”.
2. Disconnect passenger air bag assembly yellow 2–pin
connector behind the glove box assembly.
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 “ON.”
Is passenger bag sense LO more than 3.5 volts?
Go to Step 4
Ignition switch
“OFF”
Replace
passenger air
bag assembly
Go to Step 6
41. Ignition switch “OFF.”
2. Disconnect SDM.
3. Disconnect SRS driver / passenger load tool.
4. Measure resistance on SDM harness connector from terminal
“15” to terminal “12” (ignition).
Does 5–8840–0285–0 display “OL” (infinite)?
Go to Step 5
Replace SRS
harness
Go to Step 6.
5Measure resistance on SDM harness connector from terminal
“16” and terminal “12” (ignition).
Does 5–8840–0285–0 display “OL” (infinite)?
Go to Chart A
replace SRS
harness
Go to Step 6
61. Reconnect all components ensure all component are properly
mounted.
2. Ignition switch “ON”.
Is passenger bag senslo less than 3.5 volts?Ignition switch
“OFF”
Replace SDM
Go to Step 7
Go to Chart A
71. 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 7

RESTRAINT CONTROL SYSTEM 9J1–30
DTC 24 Driver Deployment Loop Short To Ground
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. 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 less than 1.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch “OFF.”
2. Disconnect SRS coil assembly yellow 2–pin connector located
at 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 DTC 24 current?
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
“6” (ground).
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 “6” (ground).
Does 5–8840–0285–0 display “OL” (infinite)?
Go to Chart A
Replace SRS
harness
Go to Step 7
61. Ignition switch “OFF.”
2. Disconnect SRS driver / passenger load tool 5–8840–2421–0
from SRS coil assembly harness connector.
3. Connect SRS driver / passenger load tool 5–8840–2421–0
and appropriate adapter 5–8840–0385–0 to driver air bag
assembly harness connector. located top of the steering
column 2–pin connector.
4. Reconnect SRS coil assembly harness connector as the base
of steering column.
5. Ignition switch “ON.”
Is DTC 24 current?
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. Clear diagnostic trouble codes.
Was this step finished?
Go to the “SRS
Diagnostic
System Check”
Go to Step 7