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 seatback frame (with side-airbag module)
  • Seat belt with pre-tensioner
  • Front impact sensor
  • Side impact sensor
  • Rear detect 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
1, 2
 Floor wiring harness → Curtain air bag wiring harness → Curtain air bag module (LH)
 Repair or replace each wiring harness.
3, 4
 Floor wiring harness → Side-airbag module (LH)
 Repair or replace the floor wiring harness.
5, 6
 Floor wiring harness → Seat belt pre-tensioner (passenger’s side)
11, 12
 Floor wiring harness → Rear detect sensor
15, 16
 Floor wiring harness → Side impact sensor (LH)
21, 22
 Floor wiring harness → Passenger’s (front) air bag module
24, 25
 Floor wiring harness → Passenger’s air bag cut off switch
27, 28
 Floor wiring harness → Clock spring → Driver’s air bag module
 Replace the clock spring, or repair or replace the floor wiring harness.
29, 30
 Floor wiring harness → Front wiring harness → Front impact sensor (LH)
Repair or replace each wiring harness.
33
 Floor wiring harness → Passenger’s air bag OFF indicator lamp
 Repair or replace the floor wiring harness.
35, 36
 Floor wiring harness → Front wiring harness → Front impact sensor (RH)
Repair or replace each wiring harness.
37
 Floor wiring harness → J/C (fuse No. 15)
Repair or replace the floor wiring harness.
38
 Floor wiring harness → Diagnosis connector
39
 Floor wiring harness → Instrument panel wiring harness → Combination meter → SRS warning lamp
 Replace the combination meter, or repair or replace the floor wiring harness.
40, 42
 Floor wiring harness → EV-ECU
 Repair or replace the floor wiring harness.
41
 Floor wiring harness → Earth
43
 Floor wiring harness → J/C (fuse No. 21)
51, 52
 Floor wiring harness → Seat belt pre-tensioner (driver’s side)
53, 54
 Floor wiring harness → Side-airbag module (RH)
55, 56
 Floor wiring harness → Curtain air bag wiring harness → Curtain air bag module (RH)
 Repair or replace each wiring harness.
61, 62
 Floor wiring harness → Side impact sensor (RH)
Repair or replace the floor wiring harness.

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

8.
caution If checks are carried out by using the SRS-ECU harness connector, observe the following procedures: Insert the special tool extra fine probe (MB992006) into connector from harness side (rear side), and connect the tester to this probe. If any tool than special tool is used, damage to the harness and other components will result. Never insert the probe directly to the terminals from the front of the connector. The terminals are plated to increase their conductivity, so that if they are touched directly by the probe, the plating may break, which will cause drops in reliability.