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No RSS Data, Loss Of Serial Communication

  1. Turn ignition on, with engine off. Using DVOM, backprobe battery positive voltage circuit terminal (Orange wire) of RSS control module connector C3 to ground. See WIRING DIAGRAMS  . If voltage is not present, go to next step. If battery voltage is present, go to step 4).
  2. Check 20-amp RTD fuse in trunk compartment fuse block. If fuse is okay, repair open in Orange wire. If fuse is blown, go to next step.
  3. Check continuity of battery positive voltage circuit (Orange wire) at RSS control module harness connector C3 to ground. See WIRING DIAGRAMS  . If continuity exists, repair short to ground in Orange wire and replace fuse. If continuity does not exist, check other related systems for cause of blown fuse and replace fuse.
  4. Using DVOM, measure voltage between ignition circuit terminal (Light Blue wire) of RSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If voltage is not present, go to next step. If battery voltage is present, go to step 7).
  5. Check 10-amp RTD fuse in trunk compartment fuse block. If fuse is okay, repair open in Light Blue wire. If fuse is blown, go to next step.
  6. Turn ignition on, with engine off. Disconnect 24-pin RSS control module connector C2. Check continuity of ignition circuit (Light Blue wire) at RSS control module harness connector C2 to ground. See WIRING DIAGRAMS  . If continuity exists, repair short to ground in Light Blue wire and replace fuse. If continuity does not exist, check for intermittent short to ground in Light Blue wire and replace fuse.
  7. Turn ignition off. Check continuity of control module ground circuit (Black wire) at RSS control module harness connector C3 to ground. See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  8. Check if Code PZ2056 is set. If Code PZ2056 is set, go to next step. If Code PZ2056 is not set, problem no longer exists. Go to NOTES ON INTERMITTENTS  under SELF-DIAGNOSTICS.
  9. Check continuity of data input circuit (Tan wire) at RSS control module harness connector C1 to EBTCM harness connector. See WIRING DIAGRAMS  . Also, check continuity of data input circuit (Tan wire) at RSS control module harness connector C1 to Body Control Module (PZM) harness connector. If continuity exists on both circuits, go to next step. If continuity does not exist on either circuit, repair open in affected Tan wire.
  10. Disconnect Electronic Brake Traction Control Module (EBTCM) connector. If NO RSS DATA fault is still present, go to next step. If NO RSS DATA fault is no longer present, diagnose anti-lock brake/traction control system. See ANTI-LOCK BRAKE SYSTEM article in BRAKES.
  11. Reconnect EBTCM connector. Disconnect Sensing and Diagnostic Module (SDM) connectors. If NO RSS DATA fault is still present, go to next step. If NO RSS DATA fault is no longer present, diagnose air bag restraint system. See AIR BAG RESTRAINT SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section.
  12. If any other body control module loss of communication codes are present, go to BODY CONTROL MODULE article in ACCESSORIES/SAFETY EQUIPMENT section. If no other body control module loss of communication codes are present, replace RSS control module. Calibrate NEW RSS control module. See CALIBRATING RSS CONTROL MODULE  under ADJUSTMENTS.
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