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DTC U1255: Serial Data Line Malfunction

  1. If referenced to this test from RKE SYSTEM CHECK, go to next step. If not referenced to this test from RKE SYSTEM CHECK, go to RKE SYSTEM CHECK  under TROUBLE SHOOTING.
  2. Turn ignition off. Install a scan tool to Data Link Connector (DLC). DLC is located under driver side of dashboard. Turn ignition on. Using scan tool, attempt to establish communications with other systems connected to same serial data line (PCM, BCM, IPC, etc.). If scan tool communicates with other systems, go to step 3). If scan tool does not communicate with other systems, repair serial data line as necessary. Further information on serial data line testing and repair is not available.
  3. Inspect serial data line for an intermittent open, short to ground or short to voltage between RFA system and IPC. Inspect splice pack 206 (instrument panel harness serial data line). Make sure bus bar is properly inserted. Inspect harness connectors for loose or damaged terminals. If a problem was found and repaired, go to step 6). If a problem was not found, go to next step.
  4. Turn ignition off. Ensure all components and connectors are connected and installed properly. Turn ignition on. Clear DTCs. See CLEARING CODES  under SELF-DIAGNOSTIC TESTING. Using scan tool, read RFA DTCs. If DTC U1255 is set, go to next step. If DTC U1255 is not set, system is okay.
  5. Replace remote control door lock receiver. See REMOTE CONTROL DOOR LOCK RECEIVER  under REMOVAL & INSTALLATION. Program both transmitters. See TRANSMITTER PROGRAMMING & SYNCHRONIZATION  under SYSTEM PROGRAMMING. Program all Tire Pressure Monitor (TPM) sensors. See TPM SENSOR PROGRAMMING  under SYSTEM PROGRAMMING. Go to next step.
  6. Turn ignition off. Ensure all components and connectors are connected and installed properly. Turn ignition on. Clear DTCs. See CLEARING CODES  under SELF-DIAGNOSTIC TESTING. Go to RKE SYSTEM CHECK under TROUBLE SHOOTING  .
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