Normal Operation

Remote locking and unlocking of the doors, opening the power liftgate (if equipped), and activating the panic alarm is accomplished by the Smart Junction Box (SJB) receiving a command message from the Remote Keyless Entry (RKE) (Integrated Keyhead Transmitter (IKT)). The IKTs  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 SJB  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 SJB  .

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