SERVICE PRECAUTIONS


caution Never heat or incinerate the air bag modules and the seat belt pre-tensioners.
1.In order to avoid injury to yourself or others from accidental deployment of the SRS air bag during servicing, read and carefully follow all the precautions and procedures described in this manual.
2.Be sure to use the tester and special tools specified in this manual (Special tool: refer to , tester: refer to ).
3.Never attempt to repair the following components:

  • SRS-ECU
  • Driver’s air bag module
  • Clock spring
  • Passenger’s (front) air bag module
  • Curtain air bag module
  • Front seat assembly incorporating side-airbag module
  • Seat belt with pre-tensioner and lap pre-tensioner
  • Front impact sensor
  • Side impact sensor
  • Knee air bag module

4.Never attempt to repair the wiring harness connectors of the SRS. If a defective wiring harness is found, repair or replace it by referring to the table follows.
SRS-ECU terminal No.
 Destination of wiring harness
 Measures
1, 2
 Floor wiring harness → side-airbag module (LH)
 Repair or replace the floor wiring harness.
3, 10
 Floor wiring harness → side impact sensor (LH)
4, 5
 Floor wiring harness → side-airbag module (RH)
6, 7
 Floor wiring harness → side impact sensor (RH)
11, 12
 Floor wiring harness → driver’s seat belt pre-tensioner
13, 14
 Floor wiring harness → driver’s seat belt lap pre-tensioner
17, 18
 Floor wiring harness → passenger’s (front) seat belt lap pre-tensioner
19, 20
 Floor wiring harness → passenger’s (front) seat belt pre-tensioner
21
 Instrument panel wiring harness → ETACS-ECU (fuse No. 21)
 Repair or replace the instrument panel wiring harness.
22, 23
 Instrument panel wiring harness → front wiring harness → front impact sensor (LH)
 Repair or replace the wiring harnesses.
27
 Instrument panel wiring harness → ETACS-ECU (fuse No. 15)
 Repair or replace the instrument panel wiring harness.
28
 Instrument panel wiring harness → diagnosis connector
30
 Instrument panel wiring harness → earth
33, 34
 Instrument panel wiring harness → CAN bus line
36, 37
 Instrument panel wiring harness → front wiring harness → front impact sensor (RH)
 Repair or replace the wiring harnesses.
38, 39
 Instrument panel wiring harness → clock spring → driver’s air bag module (squib)
 Replace the clock spring, or repair or replace the instrument panel wiring harness.
40, 41
 Instrument panel wiring harness → passenger’s (front) air bag module (squib)
 Repair or replace the instrument panel wiring harness.
42, 43
 Instrument panel wiring harness → driver’s knee air bag module
44, 45
 Instrument panel wiring harness→ roof wiring harness → curtain air bag module (RH)
 Repair or replace the wiring harness.
46, 47
 Instrument panel wiring harness→ roof wiring harness → curtain air bag module (LH)

5.Before maintenance, wait for 60 seconds or more after disconnecting the negative battery terminal. Wrap the disconnected terminal with tape for insulation. The condenser inside SRS-ECU keeps a voltage necessary to expand the air bag for a certain period even after the IG power is turned OFF. Therefore, if any operation is performed before the period elapses, it may cause serious damage.
6.If the influence of heat is suspected during painting work, remove the following parts:

  • 93°C or higher: SRS-ECU, air bag module, clock spring, front impact sensor, and side impact sensor
  • 90 °C or higher: Seat belt with pre-tensioner
7.After the maintenance of the SRS air bag and seat belt with pre-tensioner is completed, be sure to delete the diagnosis code and check whether the SRS warning lamp lights up (refer to ).