Tacoma Regular Cab 4WD L4-2.7L (3RZ-FE) (1999)
Air Bag(s) Arming and Disarming: Service and Repair
* Work must be started 90 seconds after the ignition switch is turned to the "LOCK" position and the negative (-) terminal cable is disconnected from
the battery. (The SRS is equipped with a back-up power source so that if work is started within 90 seconds of disconnecting the negative (-) terminal
cable of the battery, the SRS may be deployed.)
* When the negative (-) terminal cable is disconnected from the battery, the memory of the clock and audio system will be canceled. So before starting
work, make a record of the contents memorized in the audio memory system. When work is finished, reset the audio systems as before and adjust the
clock. To avoid erasing the memory of each memory system, never use a backup power supply from outside the vehicle.
* Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
* Do not expose the steering wheel pad, front passenger airbag assembly, airbag sensor assembly or front airbag sensor directly to hot air or flames.
AIR BAG SYSTEM DISARMING
The Air Bag/Supplemental Restraint System (SRS) incorporates a backup energy source that maintains sufficient deployment voltage for up to 90
seconds after the ignition is turned Off and the battery has been disconnected.
Before disconnecting battery, note radio station settings, since all vehicle memory will be lost. Never use a backup power source from outside the
Turn ignition to Lock, then disconnect battery ground cable.
Wait at least 90 seconds after disconnection before beginning service or diagnostic procedures.
AIR BAG SYSTEM ARMING
Ensure ignition is in Lock position.
Connect battery ground cable.
Wait at least 10 seconds before turning ignition from Lock position.
Turn ignition to ACC or On position and ensure SRS lamp lights, then goes off after approximately six seconds. If lamp remains lit, an SRS
condition is indicated. Refer to Diagnosis and Testing.