1997 MAZDA MX-5 wiring

AIR BAG RESTRAINT SYSTEM
1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
DESCRIPTION & OPERATION
The Supplemental Restraint System (SRS), when used in conjunction with seat belt, provides increased
protection for driver and front passenger in a frontal collision. The air bag restraint system consists of AIR BAG
warning light, driver-side air bag module, passenger-side air bag module, clockspring, SAS unit, and wiring
harness. See Fig. 1
. WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all WARNINGS and SERVICE PRECAUTIONS
.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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SYSTEM OPERATION CHECK
Turn ignition on. AIR BAG warning light in instrument cluster should glow for 6 seconds and then turn off. If
AIR BAG warning light does not function as described, a failure has occurred in Supplemental Restraint
System (SRS). Repair malfunctioning SRS. See DIAGNOSIS
. Also, see SERVICE PRECAUTIONS .
SERVICE PRECAUTIONS
The following precautions should be observed when working with air bag systems:
Disable air bag before servicing any air bag system/steering column component. See DISABLING &
ACTIVATING AIR BAG SYSTEM .
Because of critical system operating requirements, DO NOT service any air bag system component or
wiring harness. Corrections are made by replacement only.
DO NOT use an ohmmeter to check resistance of air bag module, as it may cause air bag deployment.
When carrying a live (undeployed) module, ensure trim cover is pointed away from your body. This
minimizes chance of injury in event of accidental air bag deployment.
When placing a live air bag module on any surface, always face trim cover upward to reduce motion of
module if it is accidentally deployed.
SAS unit must always be installed with arrow facing the front of the vehicle.
DO NOT disconnect SAS unit until unit is firmly mounted in vehicle.
Disconnecting or removing SAS unit with ignition switch in ON position can cause accidental
deployment and serious personal injury. Before disconnecting or removing SAS unit connector or
removing SAS unit, turn ignition to LOCK position.
Air bag system clockspring MUST be aligned in neutral position, since its rotation ability is limited. DO
NOT turn steering wheel or column after removal of steering gear.
A double-lock mechanism is used on clockspring connectors. DO NOT use excessive force when
disconnecting connectors, as damage to connector may occur.
ADJUSTMENTS
CLOCKSPRING CENTERING
Turn clockspring clockwise until it stops, then turn clockspring counterclockwise 2.75 turns. Align marks on
clocksprin
g with marks on outer housing. See Fig. 2.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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REMOVAL & INSTALLATION
DRIVER-SIDE AIR BAG MODULE
Removal
Before proceeding, see SERVICE PRECAUTIONS . Disable air bag system. See DISABLING &
ACTIVATING AIR BAG SYSTEM . Remove driver-side air bag module nuts. Disconnect driver-side air bag
module connector. Disconnect support rope. See Fig. 6
. Remove driver-side air bag module.
If Air Bag Did Not Deploy)Steering Column, Steering Wheel, Wiring Harness
CommentsDO NOT attempt wiring harness repairs. Replace
entire harness. Impact sensors must always be
installed with arrow on sensor facing front o
f
vehicle.
WARNING:Follow air bag service precautions to prevent accidental air bag
deployment and personal injury. See SERVICE PRECAUTIONS
.
WARNING:DO NOT install driver-side air bag module unless DTC 6 is set. This can
cause accidental deployment of the air bag. Verify DTC 6 is indicated
before installing driver-side air bag module.
NOTE: After replacing components, check system to ensure proper operation. See
SERVICE PRECAUTIONS
.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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1. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Remove meter
hood. Ensure instrument cluster 12 pin connector is securely connected and that terminal No. 1 E is not
damaged. Check continuity between terminal No. 1E of 12 pin cluster connector and terminal No. 2K of
print plate of instrument cluster. If there is continuity, go to next step. If there is no continuity, replace
print plate and then go to next step.
2. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Check if terminal
No. Q of 21 pin SAS unit connector is securely connected and is not damaged. If ok, go to next step. If
terminal Q is not securely connected or is damaged, replace air bag harness, then go to next step.
3. Disconnect 21 pin SAS unit connector and 12 pin instrument cluster connector. Check continuity between
terminal No. Q of SAS unit connector and terminal No. 1 E of instrument cluster connector. If there is
continuity, replace SAS unit and then go to next step. See SAS UNIT
under REMOVAL &
INSTALLATION. If there is no continuity, go to next step.
4. Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Check AIR BAG
warning light for proper system function. See SYSTEM OPERATION CHECK
.
WARNING LIGHT DOES NOT COME ON
Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Remove meter hood.
Ensure instrument cluster 12 pin connector is securely connected and that terminal No. 1 E is not damaged.
Check continuity between terminal No. 1E of 12 pin cluster connector and terminal No. 2K of print plate of
instrument cluster. If there is continuity, go to next step. If there is no continuity, replace print plate and then go
to next step.
WARNING LIGHT REMAINS ON
1. Measure battery voltage. If voltage is more than 9 volts, go to next step. If voltage is not more than 9
volts, check charging system.
2. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Remove dashboard.
Remove heater unit. Check if SAS unit connector is securely connected. Check short bar between SAS
unit terminal No. Q and terminal No. S. If short bar is bent, replace wiring harness and then go to next
step. If short bar is OK, go to next step.
3. Check short bar hook on SAS unit. If hook is OK, go to next step. If hook is damaged, replace SAS unit.
See SAS UNIT
under REMOVAL & INSTALLATION.
4. Disconnect SAS unit 21 pin connector and instrument panel 12 pin connector. Carefully insert an
insulation material between terminal No. Q and terminal No. S of SAS unit so short bar cannot move. NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: Use care not to damage short bar when inserting insulation material.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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5. Check continuity between terminal No. Q and ground. If continuity exists, replace or repair wiring
harness between instrument cluster and SAS unit. If no continuity exists, replace SAS unit. See SAS
UNIT under REMOVAL & INSTALLATION.
6. Activate air bag system and perform SYSTEM OPERATION CHECK
. Check that AIR BAG warning
light is operating properly. If not, reconfirm malfunction symptoms.
DTC 0 - SAS UNIT
1. Disable system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Remove dashboard.
Remove heater unit. Check if SAS unit connector is securely connected. If not, reconnect connector and
go next step. If ok, go to next step.
2. Disconnect SAS unit connector and check for continuity between terminal No. V and terminal No. Y of
SAS unit connector. If there is continuity, replace SAS unit. If there is no continuity, replace wiring
harness. Perform SYSTEM OPERATION CHECK
.
DTC 3 - BATTERY
1. Check that battery voltage is at least 8 volts. If not, check battery and/or charging system. Turn ignition
on and check voltage at joint connector terminals A or E (X-33).
2. If voltage is over 8 volts, replace SAS unit. See SAS UNIT
under REMOVAL & INSTALLATION. If
voltage is not over 8 volts, replace wiring harness from battery to fuse box. Perform SYSTEM
OPERATION CHECK .
DTC 6 - DRIVER-SIDE AIR BAG MODULE
1. Disable air ba
g system. See procedures under DISABLING & ACTIVATING AIR BAG SYSTEM. NOTE: When air bag warning light remains on, it can indicate a DTC 0 caused by no
continuity between terminal No. V and terminal No. Y of SAS unit This can be
due to a damaged SAS unit, an open or short circuit in wiring harness or poor
connections.
NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: When voltage supplied to SAS unit is less than 1 volt due to weak battery, open
or short in wiring harness, poor connection of connector or damaged SAS unit,
DTC 3 will set
NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: When resistance Is detected between terminals M-O of SAS unit is NOT 2 ohms,
DTC 6 will set.
NOTE: For connector terminal identification, see WIRING DIAGRAM
.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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Sunday, July 05, 2009 1:40:48 PMPage 17 © 2005 Mitchell Repair Information Company, LLC.

Remove driver-side air bag module. See DRIVER-SIDE AIR BAG MODULE under REMOVAL &
INSTALLATION.
2. Inspect clockspring connectors for damage. If connectors are okay, go to next step. If connectors are
damaged, replace clockspring. Perform SYSTEM OPERATION CHECK
.
3. Connect Special Service Tool (49 0839 285) to terminal No. 3B and terminal No. 3C of clockspring. Set
SST resistance to 2 ohms. Connect clockspring connector. Connect negative battery cable. Turn ignition
switch to ON position and cheek for codes. If CODE 6 is displayed, go to next step. If CODE 6 is not
present, replace driver-side air bag module. Perform SYSTEM OPERATION CHECK
.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait for 1 minute.
Disconnect clockspring connector and inspect. If pins are ok go next step. If pins are damaged, replace
wiring harness from clockspring to SAS unit.
5. Connect Special Service Tool (49 0839 285) to terminal No. A and terminal No. B of clockspring
connector. Set SST resistance to 2 ohms. Connect clockspring connector and connect negative battery
cable. Turn ignition switch to ON position and cheek for codes. If CODE 6 is displayed, go to next step.
If CODE 6 is not present, replace clockspring. See CLOCKSPRING
under REMOVAL &
INSTALLATION. Perform SYSTEM OPERATION CHECK
.
6. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait for 1 minute. Remove
dashboard and heater unit. Disconnect SAS unit connector.
7. Check wiring harness between terminal No. O of SAS unit connector and between terminal No. A of
clockspring connector. Also check between terminal No. M of SAS unit connector and terminal No. B of
clockspring connector. Check for short to ground, short to power or open circuit. If wiring is OK, replace
SAS unit. See SAS UNIT
under REMOVAL & INSTALLATION.If wiring is not OK, replace wiring
harness from clockspring to SAS unit. Perform SYSTEM OPERATION CHECK
.
DTC 7 - PASSENGER-SIDE AIR BAG MODULE
1. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM
. Inspect passenger-
side air bag module connectors for damage. If connectors are okay, go to next step. If connectors are
damaged, replace wiring harness from passenger-side air bag module to SAS unit. Perform SYSTEM
OPERATION CHECK .
2. Connect Special Service Tool (49 0839 285) to terminal No A and terminal No. B of passenger-side air
bag module connector. Set Special Service Tool resistance to 2 ohms. Connect clockspring connector.
Connect negative battery cable. Turn ignition switch to ON position and check for codes. If DTC 7 is
displayed, go to next step. If CODE 7 is not present replace passenger-side air bag module. See
PASSENGER
-SIDE AIR BAG MODULE under REMOVAL & INSTALLATION. Perform SYSTEM
OPERATION CHECK .
3. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait 1 minute. Disconnect
clocksprin
g connector. Remove dashboard and heater unit. NOTE: For connector terminal identification, see WIRING DIAGRAM
.
NOTE: When resistance is detected between terminals l-K of SAS unit is NOT 2 ohms
and/or there is no continuity between terminal No. E of SAS unit and ground,
DTC 7 will set

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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4. Disconnect SAS unit connector. Check wiring between terminal K of SAS unit connector and terminal C
of passenger-side air bag module connector for short to ground, short to power or open circuit. If wiring
is OK, replace SAS unit. See SAS UNIT
under REMOVAL & INSTALLATION. If wiring is not OK,
replace wiring harness between passenger-side air bag module and SAS unit. Perform SYSTEM
OPERATION CHECK .
WIRE REPAIR
DO NOT repair air bag system wiring. If a problem is found with air bag system wiring, replace faulty wiring.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
WIRING DIAGRAM
ApplicationFt. Lbs. (N.m)
Passenger-Side Air Bag Module Retaining Bolts13-20 (18-27)
Steering Wheel Nut29-36 (39-49)
INCH Lbs. (N.m)
Driver-Side Air Bag Module Retaining Nuts35-52 (4.0-5.8)
SAS Unit Retaining Nuts61-86 (6.7-9.8)

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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Sunday, July 05, 2009 1:40:48 PMPage 19 © 2005 Mitchell Repair Information Company, LLC.

Fig. 10: SRS Wiring Diagram

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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Sunday, July 05, 2009 1:40:48 PMPage 21 © 2005 Mitchell Repair Information Company, LLC.