2002 ISUZU AXIOM display

SUPPLEMENTAL RESTRAINT SYSTEM 9J±4
SRS Component and Wiring Location
View
060R200036
Legend
(1) Battery
(2) Relay & Fuse Box
(3) Passenger Air Bag Assembly
(4) SDM
(5) Meter Assembly
(6) SRS Coil Assembly
(7) Driver Air Bag Assembly
(8) Starter Switch
(9) Fuse Box, SRS±1
Component Description
SDM (Sensing and Diagnostic Module)
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 POINTED TOWARD THE
FRONT OF THE VEHICLE TO ENSURE PROPER
OPERATION OF THE SRS. THE SDM COULD BE
ACTIVATED WHEN POWERED WHILE NOT RIGIDLYATTACHED TO THE VEHICLE WHICH COULD CAUSE
DEPLOYMENT AND RESULT IN PERSONAL INJURY.
The Sensing and Diagnostic Module (SDM) is designed
to perform the following functions in the SRS:
1. Energy Reserve Ð The SDM maintains 24±Volt Loop
Reserve (24VLR) energy supply to provide
deployment energy when ignition voltage is lost in a
frontal crash.
2. Frontal Crash Detection Ð The SDM monitors
vehicle velocity changes to detect frontal crashes
which are severe enough to warrant deployment.
3. Air Bag Deployment Ð When a frontal crash of
sufficient force is detected, the SDM will cause
enough current to flow through the air bag assembly
to deploy the air bag.
4. Malfunction Detection Ð The SDM performs
diagnostic monitoring of SRS electrical components
and sets a diagnostic trouble code when a
malfunction is detected.
5. Frontal Crash Recording Ð The SDM records
information regarding SRS status during frontal
crash.
6. Malfunction Diagnosis Ð The SDM displays SRS
diagnostic trouble codes and system status
information through the use of a scan tool.
7. Driver Notification Ð The SDM warns the vehicle
driver of SRS malfunctions by controlling the ªAir
Bagº warning lamp.
The SDM is connected to the SRS wiring harness by a
24±pin connector. This harness connector uses a
shorting clip across certain terminals in the contact area.
This shorting clip connects the ªAIR BAGº warning lamp
to ground when the SDM harness connector is
disconnected or CPA (Connector Position Assurance) is
not inserted even if completely connected. This will
cause the ªAIR BAGº warning lamp to come ªONº steady
whenever the ignition switch is at the ON or START
positions with the SDM disconnected.
827RW023

SUPPLEMENTAL RESTRAINT SYSTEM 9J±22
Getting Started

Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. The Isuzu System PCMCIA card (1) inserts into the
Tech 2 (5).
2. Connect the SAE 16/19 adapter (3) to the DLC cable
(4).
3. Connect the DLC cable to the Tech 2 (5)
4. Make sure the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the vehicle
DLC.
060R200039
6. The vehicle ignition turns on.
7. Verify the Tech 2 power up display.
060RW009
NOTE: The RS232 loop back connector is only to use for
diagnosis of Tech 2 and refer to user guide of the Tech 2.Operating Procedure
The power up screen is displayed when you power up the
tester with the Isuzu systems PCMCIA card. Follow the
operating procedure below.
060R100102

9J1±3
RESTRAINT CONTROL SYSTEM
ªFlash Codeº Diagnostics
Flash code diagnostics can be used to read current 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 13
shorting to terminal 4 of the DLC with the ignition switch
ªONº. Grounding terminal 13 of the DLC pulls the
ªDiagnostics Requestº input (Terminal 1) of the SDM low
and signals the SDM to enter the flash code diagnostic
display mode.
The SDM displays the trouble codes by flashing the
warning lamp. Each code that is displayed will consist of a
number of flashes which represents the tens digit, a 1.2
second pause, following by a number of flashes which
represents the ones digit of the code. Each code isdisplayed one time before moving on to the next code.
After all of the codes have been displayed, the entire code
sequence will continually by repeated until ground is
removed from terminal 13 of the DLC.
Two special codes exist when reading in the flash code
mode (Flash Code 12 and Flash Code 13). ªFlash Code
12º will always be the first code displayed when the flash
code mode is enabled Code 12 is not an indication of a
SRS problem but an indication that the flash code mode
has been enabled. If there are no current or history codes
present, the SDM will display code 12 until ground is
removed from the DLC at terminal 13. ªFlash Code 13º
will be displayed if there are history codes. To read the
history codes, a scan tool must be used.
System Schematic
D09R200001

9J1±5
RESTRAINT CONTROL SYSTEM
SRS Diagnostic System Check
StepActionYe sNo
1Confirm the ªAIR BAGº warning lamp when ignition switch is
turned ªON.º
Does the ªAIR BAGº warning lamp flash seven (7) times?
Go to Step 2 Go to Step 3
2Confirm the ªAIR BAGº warning lamp after it flashed 7 times.
Does the ªAIR BAGº warning lamp go ªOFFº?
Go to Step 4 Go to Step 5
3Confirm the ªAIR BAGº warning lamp when ignition switch is
turned ªON.º
Does the ªAIR BAGº warning lamp come ªONº steady?
Go to Chart B.Go to Chart C.
41. Ignition switch ªOFF.º
2. Connect a scan tool to data link connector.
3. Follow direction given in the scan tool instruction manual.
4. Ignition switch ªON.º
5. Request the SRS diagnostic trouble code display recode all
history diagnostic trouble code(s) specify as such, on repair
order.
Is diagnostic trouble code(s) displayed?Ignition switch
ªOFF.º
When DTC 71 is
set, go to
DTC 71
chart.
For all other
history codes
refer to
ªDiagnostics
Aidsº for that
specific DTC.
A history DTC
indicates the
malfunction has
been repaired or
is intermittent.
SRS is functional
and free of
malfunctions, no
further diagnosis
is required.
If scan tool
indicates ªNo
Data Received,º
refer to chassis
electrical section.
51. Ignition switch ªOFF.º
2. Connect a scan tool to data link connector.
3. Follow directions as given in the scan tool instruction manual.
4. Ignition switch ªON.º
5. Request the SRS diagnostic trouble code display, recode all
diagnostic trouble code(s), specifying as current or history on
repair order.
Is diagnostic trouble code(s) displayed?Ignition switch
ªOFF.º
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
ªDiagnostics
Aidsº for that
specific DTC.
A history DTC
indicates the
malfunction has
been repaired or
is intermittent.
If scan tool
indicates ªNo
Data Received,º
refer to chassis
electrical section.

9J1±7
RESTRAINT CONTROL SYSTEM
Chart A SDM Integrity Check
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
11. This chart assumes that the ªSRS Diagnostic System Checkº
and either a symptom chart or a diagnostic trouble code chart
diagnosis have been performed When all circuitry outside the
SDM has been found to operate properly, as indicated by the
appropriate diagnostic chart, and the symptom or DTC
remains current, the following diagnostic procedures must be
performed to verify the need for SDM Replacement.
2. Ignition switch ªOFF.º
3. Reconnect all SRS components, ensure all components are
properly mounted.
4. Ensure the ignition switch has been ªOFFº for at least 15
seconds.
5. Confirm ªAIR BAGº warning lamp as ignition switch is turned
ªON.º
Does warning lamp flash 7 times then go ªOFFº?
The symptom or
DTC is no longer
occurring.
Clear SRS
diagnostic trouble
codes.
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 2
2Using a scan tool, request diagnostic trouble code display.
Is the same symptom or DTC occurring as was when the ªSRS
Diagnostic System Check º was first performed?Ignition switch
ªOFF.º
Go to the
appropriate chart
for the indicated
malfunction.
Go to Step 3
31. Clear ªSRS Diagnostic Trouble Codes.º
2. Ignition switch ªOFFº for at least two minutes.
3. Confirm ªAIR BAGº warning lamp as ignition switch is turned
ªON.º
Does warning lamp flash 7 times then go ªOFFº?SRS is functional
and free of
malfunctions.
No further
diagnosis is
required.
Go to
Step 4
Ignition switch
ªOFF.º
Replace SDM.
Go to
Step 4
4Reconnect all SRS components, ensure all components are
properly mounted.
Was this step finished?Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 4

9J1±9
RESTRAINT CONTROL SYSTEM
Chart B ªAIR BAGº Warning Lamp Comes ªONº Steady
StepActionYe sNo
11. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Ignition switch ªOFF.º
3. Connect scan tool to data link connector, Follow directions as
given in the scan tool instruction manual.
4. Ignition switch ªON.º
5. Request SRS diagnostic trouble code display.
Does scan tool indicate ªNo Data Receivedº?
Go to Step 2 Go to Step 3
21. Ignition switch ªOFF.º
2. Inspect SDM harness connector connection to SDM.
Is it securely connected to the SDM?
Ignition switch
ªOFF.º
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 ªignitionº more than 9 volts?
Go to Step 4
Ignition switch
ªOFF.º
Replace SDM.
Go to
Step 5
41. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assemblies.
Yellow 2±pin connectors located at base of steering column
and behind the glove box assembly.
3. Disconnect SDM.
4. Measure resistance from SDM harness connector terminal ª6º
to ground.
Does J±39200 display ª0Lº (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 ªSRS
Diagnostic
System Check.º
Go to Step 5

RESTRAINT CONTROL SYSTEM 9J1±22
5. This test determines whether the malfunction is in
CKT IB08±YEL/RED.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to ground in the passenger air bag assembly circuit.Inspect CKTs IB07±YEL/GRN and IB08±YEL/RED
carefully for cutting or chafing. If the wiring pigtail of the
passenger air bag assembly is damaged, the component
must be replaced.
DTC 18 Passenger Deployment Loop Short To Ground
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Ignition switch ªOFF.º
3. Connect scan tool data link connector. Follow directions as
given in the scan tool operator's manual.
4. Ignition switch ªON.º
5. Read passenger sense LO.
Is passenger sense LO less than 1.5 volts?
Go to Step 3 Go to Chart A .
31. Ignition switch ªOFF.º
2. Disconnect passenger air bag assembly yellow 2±pin
connector behind the glove box assembly..
3. Leave driver air bag assembly connected.
Connect SRS driver / passenger load tool J±41433 and
appropriate adapter to passenger air bag assembly harness
connector.
4. Ignition switch ªON.º
Is DTC 18 current?
Go to Step 4
Ignition switch
ªOFF.º
Replace
passenger air
bag assembly.
Go to
Step 6
41. Ignition switch ªOFF.º
2. Disconnect SRS driver / passenger load tool.
3. Measure resistance on SDM harness connector from terminal
ª15º to terminal ª6º (ground).
Does J±39200 display ª0Lº (infinite)?
Go to Step 5
Replace SRS
harness.
Go to
Step 6
5Measure resistance on SDM harness connector from terminal ª6º
ª16º to terminal (ground).
Does J±39200 display ª0Lº (infinite)?
Go to Chart A .
Replace SRS
harness.
Go to
Step 6
61. Reconnect all components, ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 6

RESTRAINT CONTROL SYSTEM 9J1±24
5. This test determines whether the malfunction is in
CKT IB08±YEL/RED.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to B+ in the passenger air bag assembly circuit. Inspect
CKTs IB07±YEL/GRN and IB08±YEL/RED carefully forcutting or chafing. If the wiring pigtail of the passenger air
bag assembly is damaged, the component must be
replaced. A careful inspection of CKT IB07±YEL/GRN
and IB08±YEL/RED, including the passenger air bag
assembly pigtail is essential to ensure that the
replacement SDM will not be damaged.
DTC 19 Passenger Deployment Loop Short To Voltage
CAUTION: When DTC 19 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 ªCLEAR CODESº 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
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Ignition switch ªOFF.º
3. Connect scan tool data link connector. Follow directions as
given in the scan tool operator's manual.
4. Ignition switch ªON.º
5. Read passenger sense LO.
Is passenger sense LO more than 3.5 volts?
Go to Step 3 Go to Chart A .
31. Ignition switch ªOFF.º
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 J±41433 and
appropriate adapter to passenger air bag assembly harness
connector.
5. Ignition switch ªON.º
Is passenger sense LO more than 3.5 volts?
Go to Step 4
Ignition switch
ªOFF.º
Replace
passenger air
bag assembly.
Go to
Step 6
41. Ignition switch ªOFF.º
2. Disconnect SDM.
3. Disconnect SRS driver / passenger load tool.
4. Measure resistance on SDM harness connector from terminal
ª15º to terminal ª12º (IGNITION 1).
Does J±39200 display ª0Lº (infinite)?
Go to Step 5
Replace SRS
harness.
Go to
Step 6
5Measure resistance on SDM harness connector from terminal
ª16º to terminal ª12º (IGNITION 1).
Does J±39200 display ª0Lº (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 ªON.º
Is passenger sense LO less than 3.5 volts?Ignition switch
ªOFF.ºReplace
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 ªSRS
Diagnostic
System Check.º
Go to Step 7