B2331

Step 1: Perform visual inspection of the steering column reach adjustment mechanism and associated wiring harness. Look for chafed, pinched, or damaged wires especially where the harness moves with column adjustment. Check for signs of water intrusion or corrosion at connectors.

Step 2: Disconnect the reach feedback potentiometer connector and measure resistance across the potentiometer terminals. Expected reading should be 1-10k ohms (varies by manufacturer) and should change smoothly as the column is manually moved through its range. A reading of 0 ohms or infinite resistance indicates potentiometer failure.

Step 3: With potentiometer disconnected, use a digital multimeter to measure resistance between each signal wire pin in the harness connector and ground. Reading should be greater than 10k ohms. A low resistance (less than 5 ohms) confirms wiring harness short to ground.

Step 4: If wiring is intact, check the reference voltage (typically 5V) at the potentiometer connector with ignition on. Verify signal wire shows approximately 0.5-4.5V depending on position when potentiometer is reconnected. Repair or replace faulty component and verify code clears after clearing DTCs and cycling ignition multiple times while operating reach adjustment.

Step 5: If all circuit tests pass, suspect BCM internal fault. Test BCM ground circuits for proper continuity and verify BCM power supply voltages are within specification before condemning the module.