SRS CONTROL SYSTEM 9C-3
Damaged SRS Connector (Case and Terminal)
If the connector or terminal of SRS harness (except lead
wire) is damaged, replace it.
Damaged Lead wire of SRS Part
If the lead wire of parts for SRS airbag, combination
switch assembly (including SRS coil assembly), etc. is
damaged, replace all the parts (including lead wire).
Procedure to stop the function of SRS
Removal
Turn the starter switch to “LOCK”, and remove the key.
1. Disconnect the SRS fuse from the fuse box on the
upper right portion of dashboard or disconnect ter-
minal of battery.
2. Remove the 2-pole connector (yellow) located in
the lower portion of steering column. (for SRS
airbag)
Caution:
When removing SRS fuse and turn starter switch to ON,
SRS warning lamp remains on. This is normal condition.
Procedure to Resume the Function of SRS
Installation
WARNING:
DO NOT USE SRS AIRBAG OF OTHER VEHICLE OR
MODEL. BE SURE TO CONFIRM THE PART NUM-
BER TO USE APPROPRIATE SRS AIRBAG.
Turn the starter switch to “LOCK”, and remove the key.
1. Connect the 2-pole connector (yellow) located in
the lower portion of steering column and confirm
that it is connected securely.
2. Install the “SRS fuse” to fuse box on the upper right
portion of dashboard.
Turn the starter switch to “ON”, and confirm that the
“SRS” warning lamp goes off after it blinks seven times.
If the “SRS” warning lamp does not operate in that way,
perform “Function check: SRS system check”.
Precautions on Handling/Installation/Diagnosis
1. Do not expose SRS airbag to temperature of 93
°C
(199
°F) or more.
2. If SRS airbag and SRS control unit are dropped
down with some sort of reason, do not use them.
3. If disconnecting connectors related to SRS airbag
and SRS control unit during repair, be sure to make
sure that they are connected completely during re-
assembly.
4. When replacing SRS control unit, install it to
mounting surface correctly. Be sure to make sure
there is no dust or other foreign matter on mounting
surface of SRS control unit.
5. When installing SRS airbag parts, be sure to tight-
en with specified tightening torque.
6. Do not energize the system unless all SRS system
parts are connected, or diagnosis chart requires
doing so. If energizing the system, unnecessary di-
agnostic trouble code will be set in SRS control
unit.
7. Never diagnose the circuit using other than speci-
fied tester.
8. At first, perform “SRS system check”.
“SRS system check” checks whether “SRS” warn-
ing lamp operates properly and proceeds to appro-
priate chart to judge the function fault of system.
Failure to perform this procedure leads to longer di-
agnosis period, wrong diagnosis or replacement of
wrong part.
About Terms
SRS airbag
This is expansion-type cloth cushion designed to be de-
ployed on frontal collision above a certain impact. SRS
airbag reduces an impact on occupant’s head and trunk
and supplements the protection by seat belts.
B+
Battery voltage (B+)
Warning lamp bulb check
When no function fault is detected after starter switch is
turned to “ON” position, “SRS” warning lamp blinks sev-
en times and goes off.
“Constant diagnosis”
Fault diagnosis is constantly performed by SRS control
unit as long as “Ignition A” voltage is within the range of
specified operating voltage of the unit.
Diagnostic connector (16-pin)
This is a connector to communicate with Tech 2.
Deployment
This means expansion of airbag.
Deployment circuit
This is a circuit which sends current to SRS airbag as-
sembly to deploy SRS airbag.
Diagnostic trouble code (DTC)
This is number used by SRS control unit to identify the
trouble in SRS function. (Self-diagnosis code)
Current supply for driver’s seat
This is output of SRS control unit to send current to driv-
er’s airbag assembly circuit during “Ignition device resis-
tance test”.
EEPROM
This is an electrically erasable programmable read only
memory. This is a memory which can store contents
without power on SRS control unit.