B1314

Step 1: Locate the battery saver relay (typically in main fuse box or power distribution center). Visually inspect relay and socket for corrosion, bent pins, or damage. Remove relay and inspect terminals for burning or discoloration.

Step 2: Using a digital multimeter, measure resistance across the relay coil terminals (typically pins 85 and 86). Normal reading should be 50-120 ohms depending on relay type. Infinite resistance indicates open coil; replace relay if faulty.

Step 3: With relay removed, check for battery voltage at the relay socket power supply terminal using multimeter. Then verify the BCM control circuit has continuity to ground when BCM commands relay on (may require service manual wiring diagram and back-probing BCM connector).

Step 4: Inspect wiring harness between BCM and relay socket for cuts, chafing, or damage. Pay special attention to areas where harness passes through firewall, near sharp edges, or moving components. Repair or replace damaged wiring as needed.

Step 5: Check BCM connector terminals for corrosion, pushed-back pins, or moisture intrusion. Clean connectors with electrical contact cleaner and ensure proper terminal tension. Verify BCM ground connections are clean and tight.

Step 6: After repairs, clear codes and command relay operation using scan tool active tests (if available). Verify relay clicks when commanded and code does not return. Monitor system for proper battery saver operation after vehicle sits for extended period.