Normal Operation

The Remote Keyless Entry (RKE) transmitter in the Intelligent Access (IA) key sends a radio signal to the Tire Pressure Monitor (TPM) module based on the user selected RKE  transmitter button. The TPM  module then communicates the command to the Remote Function Actuator (RFA) module, and the RFA  module carries out the selected action. The IA  keys and the RFA  module 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 RFA  module every time an IA  key button is pressed.

The TPM  module receives voltage at all times and has a dedicated ground circuit. The TPM  module sends Tire Pressure Monitoring System (TPMS) information over the Medium Speed Controller Area Network (MS-CAN) to the Body Control Module (BCM). The TPM  module sends all RKE  and IA  key information and requests to the RFA  module through a dedicated single circuit network.

• DTC B10AB:06 (Remote Keyless Entry Synchronization: Algorithm Based Failures) - a continuous DTC that sets when the RFA  module detects the rolling counter received from an RKE  transmitter is 1, 024 times greater than the rolling counter stored in the module.
• DTC U201F:31 (External Receiver: No Signal) - an on-demand DTC that sets when the RFA  module loses communication with the TPM  module.

This pinpoint test is intended to diagnose the following: 

• IA  key
• IA  key battery
• IA  key button pressed a substantial amount of times while outside the range of the vehicle
• TPM  module
• RFA  module