Normal Operation

Remote locking and unlocking of the doors, releasing the liftgate window, and activating the panic alarm is accomplished by the Smart Junction Box (SJB) receiving a command message from the RKE  Integrated Keyhead Transmitter (IKT). The IKT  and SJB  also utilize a rolling code to prevent the code from being "captured" by a code grabber. The system advances the counter in the RKE  transmitter and SJB  every time an IKT  button is pressed.

• DTC B1139 (Invalid Transmitter Identification Code) - a continuous DTC that sets when the Instrument Cluster (IC) detects an invalid Transmitter Identification Code (TIC) from an IKT  .
• DTC B2425 (Remote Keyless Entry Out of Synchronization) - a continuous DTC that sets when the SJB detects the rolling counter received from an RKE  transmitter is 1,024 times greater than the rolling counter stored in the module.

This pinpoint test is intended to diagnose the following: 

• IKT 
• IKT  battery
• IKT  button pressed a substantial amount of times while outside the range of the vehicle
• IKT  programming
• SJB