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RTD Diagnostic System Check

  1. Ensure Tech 1 scan tool is equipped with the latest version of chassis application program. Turn ignition off. Connect Tech 1 scan tool to Data Link Connector (DLC) located at left side of center of instrument panel, below steering column. Turn ignition on, engine off. Attempt to establish communications with RTD system. If scan tool communicates with RTD system, go to step  4 . If scan tool does not communicate with RTD system, go to next step.
  2. Using scan tool, attempt to establish communications with Body Control Module (BCM). If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Using scan tool, attempt to establish communications with Anti-Lock Brake System (ABS) module. If scan tool communicates with ABS module, go to step  6 . If scan tool does not communicate with ABS module, see appropriate ANTI-LOCK article in BRAKES.
  4. Using scan tool, select chassis menu, and then RTD menu display. Retrieve DTCs. If DTCs are present, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. If no DTCs are present, go to next step.
  5. Using scan tool, clear DTCs. Road test vehicle, avoiding smooth road surfaces. Drive equal amounts of time in each ride control switch position. Using scan tool, retrieve DTCs. If any DTCs are set, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. If no DTCs are set, system is functioning properly.
  6. Using scan tool, attempt to establish communications with other systems (PCM, IPC, etc.) connected to serial data line. If scan tool communicates with other systems, go to next step. If scan tool does not communicate with other systems, diagnose serial data line malfunction. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  7. Turn ignition on. Using test light, probe ABS/RTD (20-amp), ABS TRANS (10-amp) and RTD (10-amp) fuses located in underhood electrical center. If test light illuminates on all fuse circuits, go to next step. If test light does not illuminate on all fuse circuits, go to step  12 .
  8. Turn ignition off. Disconnect RTD module connectors. Turn ignition on. At harness side of RTD module connectors, measure voltage on all RTD module power circuits. See WIRING DIAGRAMS  . If more than 10 volts is present, go to next step. If less than 10 volts is present, go to step  14 .
  9. Turn ignition off. At harness side of RTD module connectors, check for continuity between all RTD module ground circuits and chassis ground. See WIRING DIAGRAMS. If continuity exists, go to next step. If continuity does not exist, go to step  15 .
  10. At harness side of RTD module connector C2, check for continuity between terminal D4 (Dark Blue/White wire) and DLC terminal No. 2 (Purple wire). If continuity exists, go to next step. If continuity does not exist, go to step  13 .
  11. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs go to step  16 .
  12. Repair open in ignition feed to RTD fuse. If fuse is open, locate and repair short to ground in circuit connected to fuse. See WIRING DIAGRAMS  . When repair is complete, go to step  16 .
  13. Locate and repair open in serial data line (circuit No. 1126). See WIRING DIAGRAMS. When repair is complete, go to step  16 .
  14. Locate and repair open in RTD module power circuit. See WIRING DIAGRAMS. When repair is complete, go to step  16 .
  15. Locate and repair open in RTD module ground circuit. See WIRING DIAGRAMS  . When repair is complete, go to next step.
  16. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs and retest system. If no DTCs are set, system is functioning properly. If DTCs are set, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table under SELF-DIAGNOSTICS.
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