Immobilizer Unit Removal/Installation

Disconnect the negative battery cable.
Remove in the order indicated in Fig 1.

Fig 1: Immobilizer Unit
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.

CAUTION:

After replacing the immobilizer unit with a new one, the engine cannot be started without reprogramming the ID number of the keys and the code word of the new immobilizer unit. Input the ID number and code word. (See IMMOBILIZER SYSTEM REPROGRAM PROCEDURE [CALIFORNIA EMISSION REGULATION APPLICABLE MODELS ] and IMMOBILIZER SYSTEM REPROGRAM PROCEDURE [FEDERAL EMISSION REGULATION APPLICABLE MODELS ].)