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IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-25
1 2
1. Immobilizer Control Module
coupler disconnected
2. Ohmmeter
Resistance Check
1) Disconnect Immobilizer Control Module couplers from Immobi-
lizer Control Module with ignition switch OFF.
CAUTION:
Never touch terminals of Immobilizer Control Module it-
self or connect voltmeter or ohmmeter.
2) Check resistance between each terminal of coupler discon-
nected.
CAUTION:
Be sure to connect ohmmeter probe from wire harness
side of coupler.
Be sure to turn OFF ignition switch for this check.
Resistance in table below represents that when parts
temperature is 20C (68F).
TERMINALCIRCUITNORMAL
RESISTANCECONDITION
A1 ± A2Coil antennaContinuity±
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8G-26 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
ON-VEHICLE SERVICE
PRECAUTIONS IN HANDLING IMMOBILIZER
CONTROL SYSTEM
Do not turn ON ignition switch with ignition key for immobilizer
control system put together with another one or placed quite close
to another one. Or the system may detect abnormal condition and
prevent engine from starting.
Do not turn ON ignition switch by using ignition key with any type
of metal wound around its grip or in contact with it. Or the system
may detect abnormal condition and prevent engine from starting.
Do not leave ignition key where high temperature is anticipated.
High temperature will cause transponder in ignition key to be ab-
normal or damaged.
Do not turn ON ignition switch with a radio antenna placed near
coil antenna or its harness to Immobilizer Control Module. Or the
system may detect abnormal condition and prevent engine from
starting.
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WIRE HARNESS COLOR
B : Black
B/W : Black/White
Bl : Blue
Bl/B : Blue/Black
Bl/R : Blue/Red
Br : BrownG : Green
Gr : Gray
G/R : Green/Red
Lg : Lightgreen
P : Pink
V : VioletY : Yellow
Y / G : Yellow/Green
Y/R : Yellow/Red
W : White
W/B : White/Black
1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B
4. ªAIR BAGº warning lamp in combination meter
5. ªAIR BAGº fuse in ªAIR BAGº fuse box
6. Connection detection pin
7. To ECM (or PCM), ICM (if equipped) and ABS
controller (if equipped)
8. To data link connector (DLC)
9. ªAIR BAGº monitor coupler
10. SDM
11. Contact coil assembly
12. Driver air bag (inflator) module
13. Driver seat belt pretensioner (if equipped)
14. Passenger air bag (inflator) module
15. Passenger seat belt pretensioner (if equipped)
16. Pretensioner harness (if equipped)
17. Ground for air bag system
TERMINAL
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A13 A11
A12
A14
A15
A16
Passenger air bag (inflator) moduleLow
High
CIRCUIT
Data link connector (DLC)
Low
High
Low
High
Low
High ªAIR BAGº warning lamp
Driver air bag (inflator) module
Diagnosis switch
±±±±±±±±±
Ground
Passenger pretensioner
Driver pretensioner
Ignition switch (power source)±±±±±±±±±
±±±±±±±±±
CONNECTOR ªAº (SDM connector) TERMINAL ARRANGEMENT OF SDM
(VIEWED FROM HARNESS SIDE)
L1
L2Connection detection pin
: Shorting bar
: Air bag harness
ªAº ªHº : Connector
AIR BAG SYSTEM 10B-5
SYSTEM WIRING DIAGRAM
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7. SDM
7-1. ªAIR BAGº warning lamp driver circuit 4. ªAIR BAGº warning lamp in combination meter
5. ªAIR BAGº fuse in ªAIR BAGº fuse box
6. Connection detection pin 1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B: Air bag harness
10B-16 AIR BAG SYSTEM
TABLE A ± ªAIR BAGº WARNING LAMP COMES ªONº STEADY (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.
STEPACTIONYESNO
11) Ignition switch OFF.
2) Remove and inspect ªAIR BAGº fuse.
3) Is fuse good?Go to step 2.ªBI/Rº wire short to ground.
After repair, replace
ªAIR BAGº fuse.
21) Disconnect SDM.
2) Check proper connection to SDM at
terminal ªA16º.
3) If OK then check voltage between ªA16º
terminal of SDM connector and body
ground with ignition switch ON.
4) Is it 8 V or more?Go to step 3.ªBI/Rº wire (between
ªAIR BAGº fuse and SDM
connector) open ªBI/Bº wire
(between ignition switch and
ªAIR BAGº fuse) open or short
to ground.
31) Disconnect 16p connector from
combination meter, referring to Section
8C.
2) Check resistance between ªA5º terminal
of SDM connector and body ground.
3) Is resistance 1 k or more?Substitute a known-
good SDM and
recheck.ªBIº wire (between combina-
tion meter and SDM connec-
tor) short to ground.
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7. SDM
7-1. ªAIR BAGº warning lamp driver circuit 4. ªAIR BAGº warning lamp in combination meter
5. ªAIR BAGº fuse in ªAIR BAGº fuse box
6. Connection detection pin 1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B: Air bag harness
10B-18 AIR BAG SYSTEM
TABLE B ± ªAIR BAGº WARNING LAMP DOES NOT COME ªONº (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.
STEPACTIONYESNO
11) Set parking brake.
2) Note combination meter as ignition switch
is turned ON.
3) Does the ªBRAKEº indicator (warning lamp)
come ON?Go to step 2.ªB/Wº wire, ªIG.COIL
METERº fuse or J/B
(between ignition
switch and combination
meter) open or short to
ground.
21) With ignition switch OFF, disconnect SDM.
2) Check electrical connection check
mechanism (connection detection pin).
3) Is it in good condition?Go to step 3.Repair electrical
connection check
mechanism.
31) Disconnect SDM.
2) Check proper connection to SDM at
terminal ªA5º.
3) If OK then check voltage from ªA5º terminal of
SDM connector to body ground with ignition
switch ON.
4) Is it 9 V or more?Substitute a known-good
SDM and recheck.Go to step 4 on the
next page.
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1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B
4. ªAIR BAGº warning lamp in combination meter7. Connection detection pin
8. SDM
8-1. ªAIR BAGº warning lamp driver circuit -5. ªAIR BAGº fuse in ªAIR BAGº fuse box
-6. ªAIR BAGº monitor coupler
6-1. Diagnosis switch terminal : Air bag harness
6±1 6
10B-20 AIR BAG SYSTEM
TABLE C ± ªAIR BAGº WARNING LAMP FLASHES (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.
STEPACTIONYESNO
11) Check ªAIR BAGº monitor coupler.
2) Is it connected diagnosis switch terminal and
ground terminal in ªAIR BAGº monitor coupler
by service wire?Remove service wire.Go to step 2.
21) With ignition switch OFF, disconnect SDM.
2) Measure resistance between ªA8º terminal of
SDM connector and body ground.
3) Is resistance 1 k or more?Substitute a known-good
SDM and recheck.Repair short from ªVº
wire circuit to ground.
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1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B
4. ªAIR BAGº warning lamp in combination lamp
5. ªAIR BAGº fuse in ªAIR BAGº fuse box6. DLC
7. To, ICM (if equipped)
8. Connection detection pin
9. SDM
9-1. ªAIR BAGº warning lamp driver circuit : Air bag harness
10B-22 AIR BAG SYSTEM
TABLE D ± SDM CANNOT COMMUNICATE THROUGH THE SERIAL DATA 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.
STEPACTIONYESNO
11) Make sure that scan tool (Tech 1) is free
from malfunction and correct cartridge for
air bag system is used.
2) Ignition switch OFF.
3) Check proper connection of scan tool
(Tech 1) to DLC.
4) Is connection in good condition?Go to step 2 on
next page.Properly connect scan
tool to DLC.
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: Shorting bar
: Air bag harness
1. SDM
2. Contact coil assembly
3. Driver air bag (inflator) module
10B-32 AIR BAG SYSTEM
CODE 21 ± DRIVER AIR BAG INITIATOR CIRCUIT RESISTANCE HIGH (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 ªIntermittents 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 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 21 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 3.5 or less?Substitute a known-
good SDM and
recheck.Repair high resistance
or open in ªGº or ªG/Rº
wire circuit.
