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  module 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 Transmitter Identification Code (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