Technician Safety Information
CAUTION:
Failure to carry out service operations in the correct sequence could cause the airbag system to unexpectedly deploy during servicing, possibly leading to a serious accident.
Further, if a mistake is made in servicing the airbag system, it is possible the airbag may fail to operate when required. Before performing servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the correct procedure described in the repair manual.
1. Work must be started after approx. 30 seconds or longer from the time the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery. (The airbag system is equipped with a back-up power source so that if work is started within 30 seconds of disconnecting the negative (-) terminal cable of the battery, the airbag may be deployed.)
2. When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio systems will be canceled. So before starting work, make a record of the contents memorized by the audio memory system. When the work is finished, reset the audio system and adjust the clock.
3. Malfunction symptoms of the airbag system are difficult to confirm, so the diagnostic codes become the most important source of information when troubleshooting.
4. When troubleshooting the airbag system, always inspect the diagnostic codes before disconnecting the battery.
5. Never use airbag parts from another vehicle. When replacing parts, replace them with new parts.
6. Never attempt to disassemble and repair the airbag modules, SRSCM, clock spring, and wiring in order to reuse it.
7. If the center airbag sensor assembly or air-bag module have been dropped, or if there are cracks, dents or other defects in the case, bracket, or connector, replace them with new ones.
8. After work on the airbag system is completed, perform the SRS SRI check. The airbag indicator lamp can be interrupted by other circuit fault.
If it is occurred, be sure to erase the DTC code using Scan Tool after repairing or replacing the troubled parts including fuse.
SRSCM Independent Lamp Activation
There are certain fault conditions in which the SRSCM (SRS Control Module) cannot function and thus cannot control the operation of the lamp. In these cases, the lamp is directly activated by appropriate circuitry that operates independently of the SPSCM, as follows:
1. Loss of ignition voltage supply to the SRSCM: lamp turned on continuously.
2. Loss of internal operating voltage: lamp turned on continuously.
3. Loss of SRSCM operation: lamp turned on continuously.
4. SRSCM not connected: lamp turned on through shorting bar in wiring harness connector
Clock Spring (In Multi-Function Switch)
The steering wheel must be fitted correctly to the steering column with the clock spring at the neutral position, otherwise cable disconnection and other troubles may result.
Air-bag Module (With Airbag)
1. When removing the air-bag module or handling a new airbag module, it should be placed with the pad top surface facing up. In this case, the twin-lock type connector lock lever should be in the lock state and care should be taken to place it so the connector will not be damaged. Do not store a steering wheel pad on top of another one. (Storing the pad with its metallic surface up may lead to a serious accident if the airbag should inflate for some reason.)
2. Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is very dangerous.)
3. Store the air-bag module where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.
4. When using electric welding, disconnect the airbag connector under the steering column near the MULTI-FUNCTION SWITCH connector before starting work.
SRSCM (SRS Control Module)
Install the SRSCM with the arrow on the SRSCM facing toward the front of the vehicle.