Service Precautions
WARNING:
- 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 article.
- After disconnecting the battery cable, wait 60 seconds or more before proceeding with the following work. The SRS system 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.
WARNING:
- Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.
- Do not use any electrical test equipment on or near the SRS components, except those specified on TEST EQUIPMENT .
- Never Attempt to Repair the Following Components: SRS-ECU, Clock Spring, Air Bag Module, Side Impact Sensor, Seat Belt with Pre-tensioner. If any of these components are diagnosed as faulty, they should only be replaced, in accordance with the INDIVIDUAL COMPONENT SERVICE procedures in this article, starting on INDIVIDUAL COMPONENT SERVICE .
- Do not attempt to repair the wiring harness connectors of the SRS. If any of the connectors are diagnosed as faulty, replace the wiring harness. If the wires are diagnosed as faulty, replace or repair the wiring harness according to the following table.
SRS-ECU TERMINAL SPECIFICATION
| SRS-ECU TERMINAL NO. | DESTINATION OF HARNESS | CORRECTIVE ACTION |
|---|---|---|
| 1, 2 | Instrument panel wiring harness ° Front wiring harness ° Front impact sensor (RH) | Correct or replace each wiring harness. |
| 3, 4 | Instrument panel wiring harness ° Front wiring harness ° Front impact sensor (LH) | Correct or replace each wiring harness. |
| 7 | Instrument panel wiring harness --> Ground | Correct or replace the body wiring harness. |
| 8 | Instrument panel wiring harness --> SRS warning light | Correct or replace each wiring harness. |
| 9, 10 | Instrument panel wiring harness --> Air bag module (Front passenger's side) | Correct or replace the body wiring harness. |
| 11, 12 | Instrument panel wiring harness ° Clock spring --> Air bag module (Driver's side) | Correct or replace each wiring harness. Replace the clock spring. |
| 13 | Instrument panel wiring harness --> Junction block (fuse No.3) | Correct or replace the body wiring harness. |
| 16 | Instrument panel wiring harness --> Junction block (fuse No.2) | Correct or replace the body wiring harness. |
| 20 | Instrument panel wiring harness --> Data link connector | Correct or replace the body wiring harness. |
| 27, 28 | Floor wiring harness (RH) --> Seat belt pre-tensioner (RH) | Connector or replace each wiring harness. |
| 29, 30 | Floor wiring harness (LH) --> Seat belt pre-tensioner (LH) | Connector or replace each wiring harness. |
WARNING:
- Inspection of the SRS-ECU connector harness should be carried out by the following procedure. Insert the backprobing tool into connector from harness side (rear side), and connect the tester to backprobing tool. If any tool other than backprobing tool is used, it may cause damage to the harness and other components. Furthermore, measurement should not be carried out by touching the backprobing tool directly against the terminals from the front of the connector. The terminals are plated to increase their conductivity, so if they are touched directly by the backprobing tool, the plating may break, which will decrease reliability.
- The SRS components and seat belt with pre-tensioner should not be subjected to heat, so removed the front impact sensor, SRS-ECU, air bag modules, clock spring, and seat belt pre-tensioner before drying or baking the vehicle after painting.
- Front impact sensor, SRS-ECU, air bag module, clock spring: 93° C (200°F) or more
- Seat belt with pre-tensioner 90° C (194°F) or more
- After servicing the SRS system, check the warning light operation to make sure that the system functions properly (Refer to GENERAL DESCRIPTION ).
- Make certain that the ignition switch is "LOCK" (OFF) position when the scan tool is connected or disconnected.