Hey guys, I got a 99 LX470 4 months ago with 241k miles on it. Since I bought it, the Key Fob does not work, the automatic door locks are defective, and electrical power is not delivered some systems when the car is off, such as the dome lights. More detail below:
For the Key Fob, the battery for both the main and spare key have been replaced, and the red light blinks when the buttons are pressed with no effect on unlocking/locking/alarming the car. I attempted reprogramming both Key Fobs with no luck, since it seems that no electrical power is delivered when the key is inserted in the ignition on the "LOCK" position.
This is indicated by the door open indicatior not chiming when the door is open, the dome lights remain off when the doors are open, and the radio's clock resets everytime the car is started. However, electrical power is still delivered to some components like the car horn and hazard lights without the key.
For the automatic door locks, they do not work without the key turned to "ACC" or "ON". The unlock function works flawlessly, however there is a frequent problem with locking the doors. When pressed for the first time, all doors lock. But any other time after the lock button is pressed once, the door locks switch to lock then a half second later, unlock. When repeating the attempt to lock the doors, the door locks lock with weaker and weaker force to the point of not locking anymore despite it "clicking". Additionally, the rear tailgate does not unlock with the key, only with the auto door locks. Not sure if that's an electrical issue or mechanical.
I am completely lost with this. I checked all the fuses and am fairly certain they are still good. I tried to reprogram but cannot since no power is delivered to the car when off as seen by the lack of dome lights and open door indicator chime with the key in "LOCK", yet power is still in the system as the horn and hazards work with the car off, possibly indicating a faulty fuse or relay. The battery seems good, and had no problems starting the car. Keyfob battery is brand new as well. OBD2 scantools doesn't mention anything either. Could be a faulty ECU but no other symptoms show for that.
Only thing I can think of is a busted relay or fuse that stops the alarm system and keyfob from working at all times, and the lack of electrical power that keeps the door locks and dome lights from working when powered off.
I'd like to hear what everyone thinks before I bite the bullet and take it to a shop or worse, a local lexus dealer. Any advice would be greatly appreciated!
For the Key Fob, the battery for both the main and spare key have been replaced, and the red light blinks when the buttons are pressed with no effect on unlocking/locking/alarming the car. I attempted reprogramming both Key Fobs with no luck, since it seems that no electrical power is delivered when the key is inserted in the ignition on the "LOCK" position.
This is indicated by the door open indicatior not chiming when the door is open, the dome lights remain off when the doors are open, and the radio's clock resets everytime the car is started. However, electrical power is still delivered to some components like the car horn and hazard lights without the key.
For the automatic door locks, they do not work without the key turned to "ACC" or "ON". The unlock function works flawlessly, however there is a frequent problem with locking the doors. When pressed for the first time, all doors lock. But any other time after the lock button is pressed once, the door locks switch to lock then a half second later, unlock. When repeating the attempt to lock the doors, the door locks lock with weaker and weaker force to the point of not locking anymore despite it "clicking". Additionally, the rear tailgate does not unlock with the key, only with the auto door locks. Not sure if that's an electrical issue or mechanical.
I am completely lost with this. I checked all the fuses and am fairly certain they are still good. I tried to reprogram but cannot since no power is delivered to the car when off as seen by the lack of dome lights and open door indicator chime with the key in "LOCK", yet power is still in the system as the horn and hazards work with the car off, possibly indicating a faulty fuse or relay. The battery seems good, and had no problems starting the car. Keyfob battery is brand new as well. OBD2 scantools doesn't mention anything either. Could be a faulty ECU but no other symptoms show for that.
Only thing I can think of is a busted relay or fuse that stops the alarm system and keyfob from working at all times, and the lack of electrical power that keeps the door locks and dome lights from working when powered off.
I'd like to hear what everyone thinks before I bite the bullet and take it to a shop or worse, a local lexus dealer. Any advice would be greatly appreciated!
