Normal Operation

The Remote Keyless Entry (RKE) feature is controlled by the Tire Pressure Monitor (TPM) module and the Body Control Module (BCM). When a button is pressed on an Integrated Keyhead Transmitter (IKT) the Transmitter Identification Code (TIC) and RKE command is received by the internal TPM antenna. If the TPM module determines that it is a valid and programmed TIC, it sends the RKE command and TIC to the BCM over the Medium Speed Controller Area Network (MS-CAN). When the BCM receives the RKE command, it carries out the command by controlling the door locks or activating the horn and turn signals for the panic alarm.

The RKE transmitters and the BCM 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 the BCM every time an RKE transmitter button is pressed.

• DTC B10AB: 00 (Remote Keyless Entry Synchronization: No Sub Type Information) - sets when the BCM detects the rolling counter received from an RKE transmitter is out of synchronization with the rolling counter stored in the module.
• DTC B1218: 00 (Transmitter Identification Code: No Sub Type Information) - sets when the BCM detects an invalid TIC from an IKT.

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
• TPM module
• BCM