C1004 — Power grid - right unfolding

Diagnostic algorithm

1. Connect a diagnostic scan tool, read and record C1004 and any related codes. Note freeze-frame data and system state when fault occurred.
2. Attempt normal unfolding operation while observing live data and commands. Confirm whether command is issued by control module and whether actuator provides feedback.
3. Visually inspect right-side harness, connectors and actuator for damage, corrosion or poor mating. Wiggle harness while commanding to check for intermittent faults.
4. Verify battery/resting voltage and check supply fuse/relay for the right unfolding circuit. Replace if blown or faulty.
5. Back-probe the actuator connector during a commanded cycle: confirm presence of supply voltage, ground switching/PWM and any feedback signal. Compare to the left/right known-good side if available.
6. Measure actuator resistance with ignition off; check for near-zero short or very high open-circuit resistance indicating motor/actuator fault.
7. Use a clamp ammeter to measure current during operation or when applying bench power. Excessive current suggests mechanical jam or seized motor; no current suggests open circuit.
8. If wiring and supply are good, apply controlled bench power to the actuator to verify movement and detect mechanical binding. Use suitable workshop support and safety procedures when powering actuators.
9. Repair or replace faulty wiring, connector, fuse/relay, actuator or sensor as indicated by tests. If control module communication or internal fault is suspected, follow manufacturer procedures for module reprogramming or replacement.
10. After repairs clear codes and re-test cycles several times to confirm correct operation and no recurrence of C1004.