B009D

Step 1: Perform a visual inspection of the right side sensor 4 location (typically mounted in B-pillar, C-pillar, or rocker panel area). Check for physical damage, corrosion, water intrusion, or loose mounting. Verify sensor connector is fully seated and inspect pins for corrosion or pushed-back terminals.

Step 2: Using a digital multimeter, measure resistance and continuity of the wiring harness between the sensor connector and the RCM connector. Check both power and ground circuits against manufacturer specifications (typically 0-5 ohms for good continuity). Also check for shorts to ground or power.

Step 3: Measure voltage supply at the sensor connector with ignition on. Most restraint sensors receive 5V or 12V reference voltage from the RCM. Verify voltage matches specifications and is stable without fluctuations.

Step 4: If wiring and power supply are verified good, disconnect the sensor and measure its internal resistance. Compare readings to specifications (typically 500-5000 ohms depending on sensor type). Replace sensor if out of specification.

Step 5: Clear codes and perform a test drive including moderate turns and typical driving conditions to see if the code returns. Monitor live data from the sensor if available through advanced scan tool functions.

Step 6: If all previous tests pass but code persists, suspect RCM internal fault. Verify RCM has correct software version and consider RCM replacement or reprogramming if available.