B1725

Step 1: Perform a visual inspection of the driver seat adjustment switch assembly for physical damage, worn buttons, or signs of liquid intrusion. Test the switch operation manually by pressing the rear up function and listening/feeling for actuation.

Step 2: Using a digital multimeter, backprobe the switch connector (do not disconnect yet) and measure voltage on the rear up switch circuit while activating the switch. Verify that voltage changes between approximately 0V and 5-12V (depending on manufacturer) when the switch is pressed and released.

Step 3: Disconnect the seat switch connector and inspect both male and female terminals for corrosion, bent pins, or pushed-back terminals. Check for continuity through the switch by measuring resistance across the rear up switch terminals while pressing the button (should show low resistance when pressed, infinite resistance when released).

Step 4: Trace the wiring harness from the seat switch to the BCM connection, checking for chafed insulation, breaks, or damage particularly where the harness passes under the seat tracks. Measure continuity and resistance through the entire circuit with both ends disconnected.

Step 5: If all wiring and connections test normal, use a multimeter to verify the BCM is providing proper reference voltage (typically 5V or 12V) to the switch circuit at the BCM connector. Compare readings to manufacturer specifications.

Step 6: After repairs, clear the code, cycle the seat rear up function multiple times through its full range, and verify the code does not return. Confirm proper seat operation and BCM communication.