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SRS SERVICE PRECAUTIONS



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.

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.

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 and .
Never Attempt to Repair the Following Components: air bag module, front Impact Sensor, SRS-ECU, clock spring, 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 manual, starting on .

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 NO. DESTINATION OF HARNESS CORRECTIVE ACTION
1, 2 Body wiring harness ► Front wiring harness ► Front impact sensor (RH) Sensor cable* installation procedures (Refer to .)
3, 4 Body wiring harness ► Front wiring harness ► Front impact sensor (LH) Sensor cable* installation procedures (Refer to .)
5, 6 - -
7 Body wiring harness ► Ground Repair or replace the body wiring harness.
8 Body wiring harness ► SRS warning light Repair or replace each wiring harness.
9 Body wiring harness ► Air bag module (Front passenger's side) Repair or replace each wiring harness.
10
11 Body wiring harness ► Clock spring ► Air bag module (Driver's side) Repair or replace each wiring harness replace the clock spring.
12
13 Body wiring harness ► Junction block (Fuse No. 8) Repair or replace each wiring harness.
14, 15 - -
16 Body wiring harness ► Junction block (Fuse No. 7) Repair or replace each wiring harness.
17 to 19 - -
20 Body wiring harness ► Data link connector Repair or replace each wiring harness.
21 to 28 - -
29, 30 Body wiring harness ► Floor wiring harness ► Driver's side seat belt pre-tensioner Repair or replace each wiring harness.
31 to 42 - -


NOTE: *: The sensor cable is available as service part.




Inspection of the SRS-ECU harness connector should be carried out by the following procedure. Insert the special tool MB991222 (narrow probe in the harness set) into connector from harness side (rear side), and connect the tester to this probe. If any to other than the special tool MB991222 is used, it may cause damage to the harness and other components. Furthermore, measurement should not be carried out by touching the probe directly against 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 decrease reliability.





If heat damage may occur during paint work, remove the SRS-ECU, the air bag module, clock spring, the front impact sensor, the seat belt pre-tensioner.
SRS-ECU, air bag module, clock spring, front impact sensor: 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 .)
Make certain that the ignition switch is "OFF" (LOCK) position when the scan tool is connected or disconnected.
If you have any questions about the SRS system, please contact the MMNA Tech Line.