Owner's Problem Description
The owner experienced trouble removing the ignition key, which was resolved by pressing the gearshift harder into park. Subsequently, the key had difficulty turning to the start position, temporarily fixed with WD-40. Additionally, the remote door locks stopped functioning, unlocking immediately after locking. The owner confirmed that manual locking works and both remotes have new batteries. They are unsure if the remotes need reprogramming or if a fuse issue might be causing the problem.
Professional Technical Analysis
The 1998 Volvo S70 exhibits intermittent issues with the remote door locking system, alongside ignition key removal difficulties. The vehicle features a 2.4L inline-5 engine, automatic transmission, and has an estimated mileage of 150,000 miles. The symptoms suggest possible electrical or programming issues with the remote locking system, especially since manual locking functions correctly. It's essential to assess the battery voltage and functionality of both remotes to rule out programming or signal transmission failures. Additionally, checking the dedicated fuse for the door lock system is crucial, as a blown fuse could disrupt the power supply to the locking actuators. The ignition key issues may also relate to the shift interlock mechanism, which could be affected by wear or misalignment. This condition poses a safety concern as it could lead to inadvertent unlocking while driving. Therefore, a thorough inspection of the door lock actuators, the key cylinder, and the remote programming procedure is necessary. The voltage across the door lock actuators should measure around 12V when activated, and the signal from the remote should be confirmed using a signal tester to ensure proper transmission.
Possible Causes
Most common causes (ordered by frequency):
- Remote Key Fob Programming Issue: The key fobs may require reprogramming due to a loss of signal or memory. This can occur after battery replacements or system resets. To reprogram, it typically involves specific sequences of button presses while the ignition is in the 'on' position. If the remote fails to respond, further inspection of the receiver module may be necessary. - Remote locks fail to respond, manual locks function properly, both fobs have new batteries.
- Blown Fuse in Door Lock Circuit: A blown fuse specific to the door lock system can prevent proper functioning of the remote locks. Checking the fuse box for a 10A or 15A fuse related to the door locks is critical. If the fuse is blown, replacing it should restore functionality. - Inspection of the fuse box reveals blown fuse, no power to door lock actuators.
- Ignition Lock Cylinder Wear: The key difficulty in turning to the start position may indicate wear in the ignition lock cylinder. This can lead to poor engagement of the key and may need replacement. If the cylinder is worn, it may also affect the shift interlock, contributing to the gear shift issue. - Key turns stiffly, difficulty engaging in park position, ignition lock feels rough.
Diagnostic Steps
Professional Diagnosis Process
Follow these systematic steps to accurately diagnose the issue. Each step builds on the previous one to ensure accurate diagnosis.
- STEP 1 - Key Fob Functionality Check: Start by testing the operation of both key fobs. Use a multimeter to measure battery voltage (should be around 3V) and check for continuity in the buttons. If the voltage is low or buttons are unresponsive, replace the batteries or the fob itself. Additionally, test the remote signal with a signal tester to confirm it is transmitting correctly.
- STEP 2 - Fuse Inspection: Check the vehicle's fuse box for any blown fuses related to the door lock system. Look for fuses typically labeled for door locks or central locking. Replace any blown fuses and recheck remote functionality. Document which fuse was replaced.
- STEP 3 - Key Cylinder Inspection: Inspect the ignition lock cylinder for wear or damage. This may involve removing the steering column cover to access the lock cylinder. Look for signs of wear such as rough operation or difficulty inserting/removing the key. If the cylinder is worn, replacement may be necessary to restore proper function.
- STEP 4 - Remote Reprogramming: If previous steps do not resolve the issue, proceed to reprogram the key fobs. Follow the manufacturer’s specific steps for programming, typically involving turning the ignition on and pressing the lock and unlock buttons in a certain sequence. After reprogramming, verify that both remotes function correctly.
