If the speedometer is not working, it is likely that the cable is damaged or disconnected. This is a relatively simple fix that can be done by yourself or by a mechanic.
If the HICAS dummy light is always on, it is likely that there is a problem with the HICAS system itself. This is a more complex issue that will require diagnosis by a mechanic.
Here are some things you can do to troubleshoot the problem:
1. Check the speedometer cable. Make sure that it is properly connected at both ends and that it is not damaged.
2. Check the HICAS fluid level. If the fluid is low, it can cause the dummy light to come on.
3. Check the HICAS fuses and relays. If a fuse or relay is blown, it can cause the dummy light to come on.
4. Have the HICAS system diagnosed by a mechanic. If you are unable to fix the problem yourself, you will need to take your car to a mechanic to have the HICAS system diagnosed.
In the meantime, you should avoid driving your car at high speeds. If you are caught speeding, you could be ticketed and your license could be suspended.
