B1293

Step 1: Perform visual inspection of the battery power relay location in the power distribution center. Check for obvious damage, corrosion, burned contacts, or loose connections. Remove and inspect the relay for physical damage or burned pins.

Step 2: Using a digital multimeter, test the relay coil resistance by measuring across the relay control terminals (typically pins 85 and 86). Expect 70-100 ohms for a good coil. Infinite resistance indicates an open coil and failed relay.

Step 3: Check for battery voltage at the relay power supply terminal (typically pin 30) with ignition on. Then backprobe the relay control circuit at the BCM connector while commanding relay activation with the scan tool (if available). Expect 12V when inactive and 0V (ground) when BCM commands relay on. No voltage change indicates BCM driver failure.

Step 4: Inspect and test continuity of the wiring harness between the BCM and relay socket. Check for opens, shorts to ground, or high resistance (should be less than 1 ohm). Pay special attention to connector terminals for corrosion, bent pins, or poor contact.

Step 5: Verify all related fuses in the power distribution center are intact using a test light or multimeter. Check both relay control circuit fuses and main power supply fuses.

Step 6: After repairs, clear codes, cycle ignition, and verify proper relay operation by listening for relay click and confirming affected systems now function properly. Road test if necessary and rescan for code return.