SERVICE PRECAUTIONS


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
  • Front impact sensor
  • Side impact sensor

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
5, 6
 Instrument panel wiring harness → clock spring → driver’s air bag module (1st squib)
 Replace the clock spring, or repair or replace the instrument panel wiring harness.
7, 8
 Instrument panel wiring harness → passenger’s (front) air bag module (1st squib)
 Repair or replace the instrument panel wiring harness.
9, 10
 Instrument panel wiring harness → clock spring → driver’s air bag module (2nd squib)
 Replace the clock spring, or repair or replace the instrument panel wiring harness.
11, 12
 Instrument panel wiring harness → passenger’s (front) air bag module (2nd squib)
 Repair or replace the instrument panel wiring harness.
15, 16
 Instrument panel wiring harness → CAN bus line
17
 Instrument panel wiring harness → earth
18
 Instrument panel wiring harness → centre panel assembly
19, 20
 Instrument panel wiring harness → passenger’s air bag cut off switch
21, 22
 Instrument panel wiring harness → front wiring harness → front impact sensor (LH)
Repair or replace the wiring harnesses.
23, 24
 Instrument panel wiring harness → front wiring harness → front impact sensor (RH)
31, 32
 Floor wiring harness → side-airbag module (LH)
 Repair or replace the floor wiring harness.
33, 34
 Floor wiring harness → side-airbag module (RH)
35, 36
 Floor wiring harness → driver’s seat lap pre-tensioner
39, 40
 Floor wiring harness → curtain air bag wiring harness (RH) → curtain air bag module (RH)
 Repair or replace the wiring harnesses.
41, 42
 Floor wiring harness → curtain air bag wiring harness (LH) → curtain air bag module (LH)
43, 44
 Floor wiring harness → front passenger’s seat pre-tensioner
 Repair or replace the floor wiring harness.
45, 46
 Floor wiring harness → driver’s seat pre-tensioner
49, 50
 Floor wiring harness → side impact sensor (front, rear: LH)
51, 52
 Floor wiring harness → side impact sensor (front, rear: RH)
59
 Floor wiring harness → earth
 Repair or replace the floor wiring harness.
61
 Floor wiring harness → ETACS-ECU (fuse No. 18)
62
 Floor wiring harness → ETACS-ECU (fuse No. 12)

5.Before maintenance, wait for 60 seconds or more after the disconnection of the 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, 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 ).