B1292

Step 1: Locate the battery power relay in the power distribution center or fuse box. Visually inspect the relay, socket, and surrounding wiring for corrosion, burnt contacts, melted plastic, or physical damage. Check all related fuses for continuity.

Step 2: Remove the battery power relay and test it directly using a multimeter. Measure coil resistance between control terminals (typically 50-200 ohms) and perform a bench test by applying 12V to coil terminals while checking for continuity across load terminals. Replace if relay fails bench test.

Step 3: With relay removed, inspect relay socket terminals for corrosion or damage. Using a multimeter, verify battery voltage is present at the power supply terminal of the socket. Check for proper ground at ground terminal (less than 0.5 ohms to battery negative).

Step 4: With ignition on, backprobe the BCM connector at the relay control wire terminal and measure voltage. Should see switching voltage (0V or 12V depending on relay commanded state). If no switching occurs, check control wire continuity between BCM and relay socket (should be less than 5 ohms).

Step 5: Check for short to ground or short to power on relay control circuit by disconnecting BCM connector and measuring resistance to ground and to battery voltage. Should show open circuit (infinite resistance) in both tests.

Step 6: After repairs, clear codes and perform functional test by cycling ignition on/off multiple times. Monitor live data for relay command status and verify proper system operation. Road test vehicle and confirm code does not return.