B1771

Step 1: Perform a visual inspection of the driver's seat wiring harness, particularly where it flexes under the seat rails. Look for pinched, chafed, or damaged wires that may be contacting metal seat frame or exposed to battery voltage. Check all connectors for corrosion, bent pins, or moisture intrusion.

Step 2: Disconnect the driver's seat motor connector and use a digital multimeter to check for battery voltage (12V+) on the backward motor circuit wire at the harness side with ignition on. If voltage is present with the switch not activated, the short is between the BCM and the motor connector.

Step 3: With the motor disconnected, operate the seat switch in the backward direction and measure voltage at the motor connector harness side. If no voltage is present or voltage remains constant regardless of switch position, test the seat switch by checking continuity and resistance through each position using the wiring diagram specifications.

Step 4: If wiring and switch test good, reconnect the seat motor and measure current draw during backward operation using an inductive ammeter. Compare readings to manufacturer specifications (typically 8-15 amps). Excessive current indicates internal motor short or mechanical binding.

Step 5: Clear the code and perform a functional test of all seat movement directions. Monitor live data from the BCM for seat motor command signals and actual circuit voltage/current. If the code returns immediately without switch input, suspect BCM internal fault or remaining wiring issue.

Step 6: After repairs, cycle the seat through full range of motion in all directions, clear codes, and road test vehicle. Verify code does not return and seat memory functions operate properly if equipped.