B1727

Step 1: Perform visual inspection of driver's seat switch assembly and wiring harness for obvious damage, chafing, or signs of liquid intrusion. Check all connectors for corrosion, bent pins, or moisture contamination.

Step 2: Disconnect the driver seat adjustment switch connector and use a digital multimeter to measure voltage at the BCM/module side of the rear-up switch circuit wire. Should read 0V with ignition on; if battery voltage is present, wiring harness has short to power between module and switch.

Step 3: With switch still disconnected, measure resistance of the rear-up switch circuit to battery positive and to ground using multimeter. Resistance should be infinite (open circuit) in both directions; low resistance indicates short in wiring or switch.

Step 4: If wiring tests normal, reconnect harness and test the seat switch assembly itself by measuring resistance across rear-up switch terminals while activating switch. Compare readings to manufacturer specifications; replace switch if out of range or showing short to power.

Step 5: If all external components test normal, suspect seat control module internal fault. Check module connector for proper seating, corrosion, and pin integrity. Test module ground circuits for proper continuity.

Step 6: After repair, clear codes, cycle seat functions through full range of motion multiple times, and verify code does not return. Test all seat adjustment directions to confirm proper operation.