ECU SUZUKI GRAND VITARA 2002 2.G Service Workshop Manual

YH4
GRAND
VITARA
: Shorting bar
: Air bag harness
1. SDM
2. Contact coil assembly
3. Driver air bag (inflator) module
10B-34 AIR BAG SYSTEM
CODE 22 ± DRIVER AIR BAG INITIATOR CIRCUIT RESISTANCE LOW (Page 1 of 2)
CAUTION:

When measurements are requested in this chart use specified digital multimeter with correct terminal
adapter from special tool (Connector test adapter kit).

When a check for proper connection is requested refer to ªIntermittent and Poor Connectionsº in this
section.

When an open in air bag wire harness, damaged wire harness, connector or terminal is found, replace
wire harness, connectors and terminals as an assembly.
DTC WILL SET WHEN:
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and connec-
tor terminal contact is below a specified value for specified time.
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, disconnect contact
coil connector located near the base of the
steering column.
2) Check proper connection to contact coil at
terminals in ªCº connector.
3) If OK then connect Special Tool (B) to contact
coil connector disconnected at step 1).
4) With ignition switch ON, is DTC 22 current?Go to step 2.Go to step 3 on the
next page.
21) With ignition switch OFF, disconnect SDM.
2) Check proper connection to SDM at terminals
ªA6º and ªA7º.
3) Release shorting bar in SDM connector,
referring to the figure below.
4) If OK then measure resistance between ªA6º
and ªA7º terminals with connected Special Tool
(B).
5) Is resistance 1.7
or more?Substitute a known-
good SDM and
recheck.Repair short from ªGº
wire circuit to ªG/Rº wire
circuit or from ªGº or
ªG/Rº wire circuit to
other wire circuit.

YH4
GRAND
VITARA
: Shorting bar
: Air bag harness
1. SDM
2. Contact coil assembly
3. Driver air bag (inflator) module
10B-36 AIR BAG SYSTEM
CODE 24 ±DRIVER AIR BAG INITIATOR CIRCUIT SHORT TO GROUND (Page 1 of 2)
CAUTION:

When measurements are requested in this chart use specified digital multimeter with correct terminal
adapter from special tool (Connector test adapter kit).

When a check for proper connection is requested refer to ªIntermittent and Poor Connectionsº in this
section.

When an open in air bag wire harness, damaged wire harness, connector or terminal is found, replace
wire harness, connectors and terminals as an assembly.
DTC WILL SET WHEN:
The voltage measured at driver air bag initiator circuit is below a specified value for specified time.
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, disconnect contact
coil connector located near the base of the
steering column.
2) Check proper connection to contact coil at
terminals in ªCº connector.
3) If OK then connect Special Tool (B) to contact
coil connector disconnected at step 1).
4) With ignition switch ON, is DTC 24 current?Go to step 2.Go to step 3 on the
next page.
21) With ignition switch OFF, disconnect Special
Tool (B) and SDM.
2) Measure resistance between ªA6º and ªA10º
terminals.
3) Is resistance 1 k
or more?Substitute a known-
good SDM and recheck.Repair short from ªGº or
ªG/Rº wire circuit to
ground.

YH4
GRAND
VITARA
: Shorting bar
: Air bag harness
1. From ignition switch
2. ªAIR BAGº fuse in ªAIR BAGº fuse box
3. SDM
4. Contact coil assembly
5. Driver air bag (inflator) module
10B-38 AIR BAG SYSTEM
CODE 25 ± DRIVER AIR BAG INITIATOR CIRCUIT SHORT TO POWER CIRCUIT (Page 1 of 2)
CAUTION:

When measurements are requested in this chart use specified digital multimeter with correct terminal
adapter from special tool (Connector test adapter kit).

When a check for proper connection is requested refer to ªIntermittent and Poor Connectionsº in this
section.

When an open in air bag wire harness, damaged wire harness, connector or terminal is found, replace
wire harness, connectors and terminals as an assembly.
DTC WILL SET WHEN:
The voltage measured at driver air bag initiator circuit is above a specified value for specified time.
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, disconnect contact
coil connector located near the base of the
steering column.
2) Check proper connection to contact coil at
terminals in ªCº connector.
3) If OK then connect Special Tool (B) to contact
coil connector disconnected at step 1).
4) With ignition switch ON, is DTC 25 current?Go to step 2.Go to step 3 on the
next page.
21) With ignition switch OFF, disconnect Special
Tool (B) and SDM.
2) Measure voltage from ªA7º terminal to body
ground.
3) With ignition switch ON, is voltage 1 V or less?Substitute a known-
good SDM and
recheck.Repair short from ªGº or
ªG/Rº wire circuit to
power circuit.

YH4
GRAND
VITARA
(A)
AIR BAG SYSTEM 10B-41
CODE 31 ± POWER SOURCE VOLTAGE HIGH (Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, disconnect SDM.
2) Check proper connection to SDM at
ªA16º terminal.
3) If OK then ignition switch ON, and then check
voltage from ªA16º terminal on SDM harness
connector to body ground.
4) Is voltage 14 V or less?Go to step 2.Check Charging System
and repair as necessary.
(Refer to SECTION 6H
ªChanging Systemº)
21) With ignition switch OFF, reconnect SDM
2) With ignition switch ON, is DTC 31 current?Substitute a known-
good SDM and recheck.Check Charging System
and repair as necessary.
(Refer to SECTION 6H
ªChanging Systemº)
Fig. for STEP 1
Special Tool
(A): 09932-76010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA
(A)
AIR BAG SYSTEM 10B-43
CODE 32 ± POWER SOURCE VOLTAGE LOW (Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) Measure voltage on battery.
2) Is voltage 11 V or more?Go to step 2.Check Charging System
and repair as necessary.
(Refer to SECTION 6H
ªChanging Systemº)
21) With ignition switch OFF, disconnect SDM.
2) Check proper connection to SDM at ªA16º
terminal.
3) If OK then ignition switch ON, and then check
voltage from ªA16º terminal on SDM harness
connector to body ground.
4) Is voltage 8 V or more?Go to step 4.Go to step 3.
31) With ignition switch OFF, disconnect ignition
connector (ªFº connector) in air bag harness.
2) Check proper connection at terminal in ªFº
connector.
3) If OK then ignition switch ON, and then check
voltage from terminal in ªFº connector on main
harness to body ground.
4) Is voltage 8 V or more?Repair poor connec-
tion, high resistance
in ªBI/Rº or ªBI/Bº
circuit of air bag
harness or
ªAIR BAGº fuse.Possibly faulty points are
as follows. Check each of
them and repair as
necessary.

Circuit from battery to
ªFº connector

Charging System
(Refer to SECTION
6H ªChanging Systemº)
41) With ignition switch OFF, reconnect SDM
2) With ignition switch ON, is DTC 32 current?Substitute a known-
good SDM and
recheck.Check Charging System
and repair as necessary.
(Refer to SECTION 6H
ªChanging Systemº)
Fig. for STEP 2
Special Tool
(A): 09932-76010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA (A)
For DTC 45
ªA11º
ªA12º
(A)
For DTC 41
STEERING WHEEL 1. Pretensioner
harness
EXAMPLE: For driver side
AIR BAG SYSTEM 10B-45
CODE 41 ± DRIVER PRETENSIONER INITIATOR CIRCUIT RESISTANCE HIGH
CODE 45 ± PASSENGER PRETENSIONER INITIATOR CIRCUIT RESISTANCE HIGH
(Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, remove front
pillar lower trim of applicable side then
disconnect seat belt pretensioner
connector.
2) Check proper connection to applicable
seat belt pretensioner at terminals in ªGº
or ªHº connector.
3) If OK then connect Special Tool (B) to
seat belt pretensioner connector
disconnected at the step 1).
4) With ignition switch ON, is DTC 41 or
45 still current?Go to step 2.1) Ignition switch OFF.
2) Replace seat belt preten-
sioner (Refer to
SECTION 10A).
21) With ignition switch OFF, disconnect
SDM.
2) Check proper connection to SDM at
terminals ªA13º and ªA14º or ªA11º
and ªA12º.
3) If OK then measure resistance between
ªA13º and ªA14º terminals or ªA11º and
ªA12º terminals with connected Special
Tool (B).
4) Is resistance 2.9
or less?Substitute a known-
good SDM and recheck.DTC41:
Repair high resistance or
open in ªPº or ªWº wire
circuit.
DTC45:
Repair high resistance or
open in ªLgº or ªBrº wire
circuit.
Fig. for STEP 1 and 2 Fig. for STEP 2
Special Tool
(A): 09932-76010
(B): 09932-75010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA (A)
For DTC 46
ªA11º
ªA12º
(A)
For DTC 42
2. Pretensioner
harnessSTEERING WHEEL
EXAMPLE: For driver side
AIR BAG SYSTEM 10B-47
CODE 42 ± DRIVER PRETENSIONER INITIATOR CIRCUIT RESISTANCE LOW
CODE 46 ± PASSENGER PRETENSIONER INITIATOR CIRCUIT RESISTANCE LOW
(Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, remove front
pillar lower trim of applicable side then
disconnect seat belt pretensioner
connector.
2) Check proper connection to applicable
seat belt pretensioner at terminals in ªGº
or ªHº connector.
3) If OK then connect Special Tool (B) to
seat belt pretensioner connector
disconnected at the step 1).
4) With ignition switch ON, is DTC 42 or
46 still current?Go to step 2.1) Ignition switch OFF.
2) Replace seat belt preten-
sioner (Refer to
SECTION 10A).
21) With ignition switch OFF, disconnect
SDM.
2) Check proper connection to SDM at
terminals ªA13º and ªA14º or ªA11º
and ªA12º.
3) If OK then measure resistance between
ªA13º and ªA14º terminals or ªA11º and
ªA12º terminals with connected Special
Tool (B).
4) Is resistance 1.7
or more?Substitute a known-
good SDM and recheck.DTC42:
Repair short from ªPº wire
circuit to ªWº wire circuit or
from ªPº or ªWº wire circuit to
other wire circuit.
DTC46:
Repair short from ªLgº wire
circuit to ªBrº wire circuit or
from ªLgº or ªBrº wire circuit
to other wire circuit.
Fig. for STEP 1 and 2 Fig. for STEP 2
Special Tool
(A): 09932-76010
(B): 09932-75010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA (A)
ªA11º
(A)
1. Pretensioner
harness
For DTC 43
For DTC 47
STEERING WHEEL
EXAMPLE: For driver side
AIR BAG SYSTEM 10B-49
CODE 43 ± DRIVER PRETENSIONER INITIATOR CIRCUIT SHORT TO GROUND
CODE 47 ± PASSENGER PRETENSIONER INITIATOR CIRCUIT SHORT TO GROUND
(Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, remove front
pillar lower trim of applicable side then
disconnect seat belt pretensioner
connector.
2) Check proper connection to applicable
seat belt pretensioner at terminals in ªGº
or ªHº connector.
3) If OK then connect Special Tool (B) to
seat belt pretensioner connector
disconnected at the step 1).
4) With ignition switch ON, is DTC 43 or 47
still current?Go to step 2.1) Ignition switch OFF.
2) Replace seat belt preten-
sioner (Refer to
SECTION 10A).
21) With ignition switch OFF, disconnect
Special Tool (B) and SDM.
2) Measure resistance between ªA13º or
ªA11º and ªA10º terminals.
3) Is resistance 1 k
or more?Substitute a known-
good SDM and recheck.DTC43:
Repair short ªPº or ªWº wire
circuit to ground.
DTC47:
Repair short from ªLgº or ªBrº
wire circuit to ground.
Fig. for STEP 1 and 2 Fig. for STEP 2
Special Tool
(A): 09932-76010
(B): 09932-75010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA (A)
(A)1. Pretensioner
harness
For DTC 44
For DTC 48
STEERING WHEEL
EXAMPLE: For driver side
AIR BAG SYSTEM 10B-51
CODE 44 ± DRIVER PRETENSIONER INITIATOR CIRCUIT SHORT TO POWER CIRCUIT
CODE 48 ± PASSENGER PRETENSIONER INITIATOR CIRCUIT SHORT TO POWER CIRCUIT
(Page 2 of 2)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) With ignition switch OFF, remove front pillar
lower trim of applicable side then
disconnect seat belt pretensioner connector.
2) Check proper connection to applicable
seat belt pretensioner at terminals in ªGº or
ªHº connector.
3) If OK then connect Special Tool (B) to
seat belt pretensioner connector
disconnected at the step 1).
4) With ignition switch ON, is DTC 44 or 48
still current?Go to step 2.1) Ignition switch OFF.
2) Replace seat belt
pretensioner (Refer
to SECTION 10A).
21) With ignition switch OFF, disconnect Special
Tool (B) and SDM.
2) Measure voltage from ªA14º or ªA12º
terminal to body ground.
3) With ignition switch ON, is voltage 1 V or
less?Substitute a known-
good SDM and recheck.DTC44:
Repair short ªPº or ªWº
wire circuit to power
circuit.
DTC48:
Repair short from ªLgº or
ªBrº wire circuit to power
circuit.
Fig. for STEP 1 and 2 Fig. for STEP 2
Special Tool
(A): 09932-76010
(B): 09932-75010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Clear diagnostic trouble codes (refer to ªDiagnostic Trouble Code (DTC) Clearanceº), if any.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.

YH4
GRAND
VITARA
10B-52 AIR BAG SYSTEM
CODE 51 ± FRONTAL CRASH DETECTED (SYSTEM ACTIVATION COMMAND IS OUT-
PUTTED)
DTC WILL SET WHEN:
The SDM detects a frontal crash of sufficient force to warrant activation of the air bag system. (SDM outputs a de-
ployment/activation command.)
NOTE:
Before executing items in this table, be sure to perform ªAir Bag Diagnostic Check Flow Tableº.
STEP
ACTIONYESNO
11) Ignition switch OFF.
2) Has air bag system deployed?Replace components and
perform inspections as
directed in ªRepairs and
Inspections Required after
an Accidentº in this section.Go to step 2.
21) Inspect front of vehicle and
undercarriage for signs of impact.
2) Are there signs of impact?Replace components and
perform inspections as
directed in ªRepairs and
Inspections Required after
an Accidentº in this section.Substitute a known-good
SDM and recheck.
NOTE:

CODE 51 can never be cleared once it has been set.

Upon completion of inspection and repair work, perform following items.
1) Replace SDM.
2) Reconnect all air bag system components, ensure all components are properly mounted.
3) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the
trouble has been corrected.