LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2000 >> Eldorado ESC >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC B2477: Reverse Light Relay Shorted To Ground >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B2477: Reverse Light Relay Shorted To Ground: Testing

  1. If lighting system diagnostic system check has been performed, go to next step. If lighting system has not been performed, go to LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Ensure transmission is in Park position. Remove REVERSE relay from rear compartment relay center No. 4. See Figure . Using DVOM, measure resistance between ground and REVERSE relay terminal C3 (Dark Green wire). See BACK-UP LIGHTS article. If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step  4 .
  3. Repair short to ground in Dark Green wire between rear compartment relay center No. 4 and PZM. After repairs, go to step  5 .
  4. Replace PZM. See PLATFORM ZONE MODULE (PZM)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  5. Use scan tool to clear DTCs. Recheck system operation. Recheck for DTCs. If DTC resets, go to step  2 . If DTC does not reset, repair is complete.
scientia non olet · About LEMON Manuals