DTC U1255: Serial Data Line Malfunction: Testing
- If referenced to this test from REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK, go to next step. If not referenced to this test from REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK, go to REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.
- Turn ignition off. Install a scan tool to Data Link Connector (DLC). DLC is located under driver's 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. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
- Inspect serial data line for an intermittent open, short to ground or short to voltage between RFA system and IPC. Inspect splice pack No. 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.
- Turn ignition off. Ensure all components and connectors are connected and installed properly. Turn ignition on. Clear DTCs. See CLEARING CODES . Using scan tool, read RFA DTCs. If DTC U1255 is set, go to next step. If DTC U1255 is not set, system is okay.
- 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 TIRE PRESSURE MONITOR (TPM) SENSOR PROGRAMMING under SYSTEM PROGRAMMING. Go to next step.
- Turn ignition off. Ensure all components and connectors are connected and installed properly. Turn ignition on. Clear DTCs. See CLEARING CODES . Go to REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.