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419-10-8 Body Electronics Module (BEM) 419-10-8 DESCRIPTION AND OPERATION (Continued) teach, CTS calibration factor loading and PCM Acknowledgment of a successfully taught first key will parameter reset functions need to be performed. be by cycling the door locks once, twice for the second key and so on. BEM and PCM security status can be identified by the Acknowledgment will normally occur within 2.5 BEM’s mobilisation status and current status of the seconds of inserting the key and turning to the ignition PCM communications PID’s respectively. CTS on position. Turn the ignition to the off position and calibration factor can be read by the WDS. If a remove the key, immediately insert the next key to be calibration factor has not been loaded then DTC will taught and turn to the ignition on position. If a key be set on the BEM until a valid calibration factor is cannot be programmed then no acknowledgment will loaded. be received. Normal Operation — BEM Mobilisation Dealer teach mode will be terminated by the following conditions: With the ignition switch in the off position, the BEM will be in the armed state. Turning the ignition key to Interruption to the BEM power. the accessories, ignition or start position will cause Leaving the ignition in the off position for 10 seconds. the BEM to commence a challenge of the ignition Turning the ignition to the on position with a DST key key’s Digital Signature Transponder (DST). Each time that has been programmed; once more than two keys a new challenge is made the old challenges are have been taught. flagged as used. If the response is known by the BEM then it will mobilise. Failure of the challenge will result Once eight keys have been taught. in the mobilisation state changing to immobilised and Exiting the Dealer teach mode will be confirmed by a a transponder DTC will be logged to identify the type door lock cycle. of error. If an incorrect response is received a new challenge will begin, this will be repeated until a Customer Spare DST Key Teach Mode correct response is received or the ignition is turned The customer key teach mode allows the owner off. If an attempt is made to scan the BEM, it will shut limited teach and delete key function. To enter down for a set period, after this time the BEM will customer key teach mode, the owner must have two resume with a new random challenge. Once a valid valid keys that are already taught to the BEM. Insert response is received and the BEM mobilised then the one of the trained keys into the ignition lock and turn challenges will stop. to the accessories position, turn to off and remove the key. Within 5 seconds insert the second key and turn Normal Operation PCM Enabling to the ignition on position. At this point the door locks Once the ignition switch is in the accessories, ignition should cycle to indicate the teach mode has been or start position, the BEM will look for a pre-challenge entered. To teach additional keys to the BEM, insert request from the PCM, and respond with a challenge the new key and turn to the ignition position, if request message. Any challenges from the PCM will successful the door lock cycling will indicate the cause the BEM to respond with a not ready, reading number of keys taught. Once acknowledgment has transponder message. Once the BEM has mobilised, occurred turn the key to off and insert the next key to it will request a challenge from the PCM and wait for be taught. Up to additional 6 keys may be taught in the challenge message from the PCM to appear on this way. the CAN bus. The BEM will calculate a response from For key deletion only the keys that are not taught to information learnt from the PCM and transmit a the BEM will be deleted. The two known keys used to response code. A challenge acknowledgment enter teach mode plus any additional keys taught will message from the PCM shall indicate to the BEM that be valid, all other keys will be erased. To exit teach the response has been accepted. PCM mode leave the ignition on for longer than 10 communication status may be monitored using BEM seconds. An acknowledgment will be received when diagnostics. the BEM exits teach mode. Dealer DST Key Teach Mode PCM Parameter Reset This mode is used by dealers to teach new DST keys A PCM parameter reset will be required if either a to a replacement BEM. The mode can also erase DST BEM or a PCM are replaced in the field or a dealer keys. To enter this mode using the WDS tester ensure DST ignition key teach is performed. If PCM that the ignition is turned to the off position. Entry into parameter reset invoked by WDS it will also require the mode and deletion of the PCM ID is confirmed by the entry of a CTS calibration factor. a mode acknowledgment. The BEM must be mobilised by turning the ignition to Select the anti-theft status screen, and then select the on position using a taught DST Key. Using the Transponder Dealer Teach Mode. Insert DST key 1 WDS tester select PCM parameter reset function, into the ignition lock, then turn to the ignition on complete the steps indicated on the WDS screen. position. For each DST key, the BEM will record the DST unique identification number and program the DST with its own encryption code key. G43560 en |