SRS SERVICE PRECAUTIONS


danger In order to avoid injury to yourself or others from accidental deployment of the air bag during servicing, read and carefully follow all the precautions and procedures described in this manual.
caution
  • Do not use any electrical test equipment on or near SRS components, except those specified on .
  • Never Attempt to Repair the Following Components:

    • SRS air bag control unit (SRS-ECU)
    • Clock spring
    • Driver’s and passenger’s (front) air bag modules
    • Side-airbag module
    • Curtain air bag module
    • Front impact sensor
    • Side impact sensors
    • Seat belt with pre-tensioner
note If any of these components are diagnosed as faulty, they should only be replaced, in accordance with the INDIVIDUAL COMPONENTS SERVICE procedures in this manual, starting at page .

caution Do not 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 below.
SRS-ECU terminal No.
 Destination of harness
 Remedy
5, 6
 Floor wiring harness (LH) → Curtain air bag module (LH)
 Correct or replace floor wiring harness.
7, 8
 Floor wiring harness (LH) → Seat belt pre-tensioner (LH)
 Correct or replace the floor wiring harness.
9, 10
 Floor wiring harness (LH) → Side-airbag module (LH)
 Correct or replace the floor wiring harness.
15, 16
 Floor wiring harness (LH) → Side impact sensor (rear) (LH)
 Correct or replace the floor wiring harness.
19, 20
 Floor wiring harness (LH) → Side impact sensor (front) (LH)
 Correct or replace the floor wiring harness.
23
 Instrument panel wiring harness → Junction block (fuse No.3)
 Correct or replace the instrument panel wiring harness.
24
 Instrument panel wiring harness → Junction block (fuse No.2)
 Correct or replace the instrument panel wiring harness.
27, 28
 Instrument panel wiring harness → Passenger’s (front) air bag module 1st squib side
 Correct or replace the instrument panel wiring harness.
30, 31
 Instrument panel wiring harness → Passenger’s (front) air bag module 2nd squib side
 Correct or replace the instrument panel wiring harness.
32
 Instrument panel wiring harness → Can_H line
 Correct or replace the can line.
33, 34
 Instrument panel wiring harness → Clock spring → Driver’s air bag module 2nd squib side
 Correct or replace instrument panel wiring harness. Replace the clock spring.
36, 37
 Instrument panel wiring harness → Clock spring → Driver’s air bag module 1st squib side
 Correct or replace instrument panel wiring harness. Replace the clock spring.
38, 39
 Instrument panel wiring harness → Front wiring harness → Front impact sensor (LH)
 Correct or replace each wiring harness.
40
 Instrument panel wiring harness→ Earth
 Correct or replace the instrument panel wiring harness.
43
 Instrument panel wiring harness → Can_L line
 Correct or replace the can line.
47, 48
 Instrument panel wiring harness → Control wiring harness → Front impact sensor (RH)
 Correct or replace each wiring harness.
57, 58
 Floor wiring harness (LH) → Floor wiring harness (RH) → Side-airbag module (RH)
 Correct or replace each wiring harness.
59, 60
 Floor wiring harness (LH) → Floor wiring harness (RH) → Seat belt pre-tensioner (RH)
 Correct or replace each wiring harness.
61, 62
 Floor wiring harness (LH) → Floor wiring harness (RH) → Curtain air bag module (RH)
 Correct or replace each wiring harness.
63, 64
 Floor wiring harness (LH) → Floor wiring harness (RH) → Side impact sensor (front) (RH)
 Correct or replace each wiring harness.
67, 68
 Floor wiring harness (LH) → Floor wiring harness (RH) → Side impact sensor (rear) (RH)
 Correct or replace each wiring harness.

danger After disconnecting the battery cable, wait 60 seconds or more before proceeding with the following work. In addition, insulate the negative battery terminal with a tape. The condenser inside the SRS-ECU is designed to retain enough voltage to deploy the air bag for a short time even after the battery has been disconnected, so serious injury may result from unintended air bag deployment if work is done on the SRS system immediately after the battery cables are disconnected.

caution
  • The SRS components and seat belt with pre-tensioner should not be subjected to heat, so remove the SRS-ECU, driver’s and passenger’s (front) air bag modules, clock spring, side-airbag modules, impact sensor and seat belt pre-tensioner before drying or baking the vehicle after painting.

    • SRS-ECU, air bag modules, clock spring, impact sensors: 93°C or more
    • Seat belt with pre-tensioner: 90°C or more
  • Whenever you finish servicing the SRS, always erase the diagnosis code and check warning lamp operation to make sure that the system functions properly.
  • 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.