B2857

Step 1: Perform a visual inspection of the steering column area, checking for obvious damage to wiring harness, connectors, or switch assembly. Look for pinched wires, worn insulation, or signs of previous repairs near the column adjustment mechanism.

Step 2: Disconnect the telescoping column switch connector and use a digital multimeter to measure resistance between the 'out' switch signal wire terminal (on the harness side) and chassis ground. Should read infinite resistance (open circuit); any continuity confirms a short to ground in the wiring harness.

Step 3: With the switch connector still disconnected, measure resistance across the switch terminals (on the switch side) while activating the 'out' switch. Should read open circuit when not pressed and low resistance (typically less than 5 ohms) when pressed. If switch shows continuity to ground terminal when released, replace the switch assembly.

Step 4: Inspect the steering column wiring harness carefully along its length, particularly where it flexes during tilt/telescope adjustment. Use a test light or multimeter to perform a wiggle test on suspect areas while monitoring for intermittent shorts to ground.

Step 5: If all wiring and switch test good, reconnect all components and monitor the circuit voltage at the BCM connector (if accessible) using a multimeter. The circuit should show battery voltage or a specific reference voltage when switch is not activated. A constant ground reading indicates a BCM internal fault.

Step 6: Clear the code, cycle the telescoping column function through its full range, and verify repair by checking for code return and proper operation of the telescoping feature in both directions.