Service Precautions
- 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 service information.
- Be sure to use the tester and special tools specified in this service information (Special tool: refer to SPECIAL TOOLS tester: refer to TEST EQUIPMENT ) .
- 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
- 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 3, 4 Instrument panel wiring harness → Clock spring → Driver's air bag module 2nd squib side Correct or replace the instrument panel wiring harness. Replace the clock spring. 5, 6 Instrument panel wiring harness → Clock spring → Driver's air bag module 1st squib side 7, 8 Instrument panel wiring harness → Passenger's (front) air bag module 1st squib side Correct or replace the instrument panel wiring harness. 9, 10 Instrument panel wiring harness → Passenger's (front) air bag module 2nd squib side 13 Instrument panel wiring harness → Passenger's air bag OFF indicator light 16 Floor wiring harness → EV-ECU 17, 27 Instrument panel wiring harness → Front wiring harness → Front impact sensor (LH) Correct or replace each wiring harness. 18, 28 Instrument panel wiring harness → Front wiring harness → Front impact sensor (RH) 21 Floor wiring harness → Junction block (fuse No. 21) Correct or replace the floor wiring harness. 22 Floor wiring harness → Junction block (fuse No. 15) 24 Instrument panel wiring harness → Ground Correct or replace the instrument panel wiring harness. 29, 30 Instrument panel wiring harness → CAN bus line 31, 32 Floor wiring harness → Front passenger's seat belt pre-tensioner Correct or replace the floor wiring harness. 36, 37 Floor wiring harness → Curtain air bag module (LH) 39, 40 Floor wiring harness → Side-airbag module (LH) 41, 42 Floor wiring harness → Side impact sensor (LH) 53, 58 Floor wiring harness → Seat slide sensor 54, 55 Floor wiring harness → Driver's seat belt pre-tensioner 56, 57 Floor wiring harness → Side-airbag module (RH) 59, 60 Floor wiring harness → Curtain air bag module (RH) 64, 65 Floor wiring harness → Side impact sensor (RH) - Before maintenance, wait for 60 seconds or more after the disconnection of the auxiliary/starter 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 electric motor switch power is turned OFF. Therefore, if any operation is performed before the period elapses, it may cause serious damage.
- If the influence of heat is suspected during painting work, remove the following parts:
- 93°C (199 °F) or higher: SRS-ECU, air bag module, clock spring, front impact sensor, side impact sensor, rear detect sensor
- 90 °C (194 °F) or higher: Seat belt with pre-tensioner
- After the maintenance of the SRS air bag and seat belt with pre-tensioner is completed, be sure to delete the diagnostic trouble code and check whether the SRS warning lights up (refer to SRS WARNING LIGHT CHECK )
. 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.