Why isn't there a Keyless entry FAQ!!!! - ClubLexus - Lexus Forum Discussion

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Why isn't there a Keyless entry FAQ!!!!

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Old 02-28-10, 07:10 PM   #1
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Default Why isn't there a Keyless entry FAQ!!!!

I have many questions and after reading many threads with tons of different info I think we should have this all together somewhere.

Alright, so since i have my panels off i was looking at the box to see what my code would be for my car to get another keyless entry remote. i didnt see a code when i glanced im going to look again but online I found this:

Registaration of recognition code:

Follow the flow chart on the following page to register the transmitter recognition code with the wireless door lock ECU.

- If the prescribed conditions are not enetered while registering the transmitter code, the wireless door lock ECU returns to normal operation.
- There are 4 modes: add mode, rewrite mode, confirmation mode, and erase mode; the mode to use is decided after the recognition code is registered.
- If a maximum of 4 recognition codes can be registered

- The add mode is used to retain codes already registered while you register new recognition codes. However, if the number of registered codes exceeds 4 codes, previous registered codes are correspondingly erased in order, starting from the first registered code.
- The rewrite mode is used to erase all previous registered codes before registering new recognition codes. This mode is used when replacing the transmitter or wireless door lock ECU.
- The confirmation mode is for confirming how many recognition codes are already registered before you register additioned recognition codes.
- The erase mode is used to erase all registered modes and cancels the wireless door lock operates. Use this mode when the transmitter is lost.

Here's the actual process, it's complicated and it took me a couple of tries to do it right.

To begin with, the vehicle should be as follows
- The key is not inserted in the ignition key cylinder
- Driver's door is OPEN (other doors are CLOSED)
- Driver's door is UNLOCKED

1. Insert the key into the ignition key cylinder, then remove it.

2. Within 40 seconds: Using the door control switch (for manual operation) move the switch 5 times to LOCK/UNLOCK at approximately 1 second intervals (so in this step, hit the lock button on the driver's door, then the unlock button a second later, and repeat 5 times)

3. Close the driver's door, then open it

4. Repeat step 2, again within 40 seconds

5. Insert the key into the ignition cylinder

6. Turn the ignition switch (the key) from ON to LOCK at approximately 1 second intervals for 1 - 5 times, depending on which mode..

Add mode - 1 time
Rewrite mode - 2 times
Confirmation mode - 3 times
Erase mode - 5 times

7. Remove the key from the ignition key cylinder

8a. If add, rewrite, or erase mode have been selected:

The car should now lock and unlock the door itself, the number of times depending on which mode you selected. The number will be the same number you used to select the mode. So if you chose add, then the car will lock and unlock once, if you chose rewrite, then the car will lock and unlock twice...

8b. The car will lock/unlock itself at 2 second intervals for each set of code programmed into the car.

9. Press the transmitter switch for at least 1 second

10. The wireless door lock ECU automatically performs LOCK-UNLOCK once at a 1 second interval to inform the technician that it has received the signal from the transmitter

11. Close the driver's door, then open it.

12. Press the transmitter switch for at least 1 second

13. The car will LOCK-UNLOCK one or twice at 1 second intervals. If it LOCK-UNLOCK's once, then the it is completed. If it LOCK-UNLOCK's twice, then it has not been completed because the ECU didn't receive the same code from steps 9 and 12 or when selecting add mode, a recognition code indicating registration completed was already received.

In case it lock-unlock's twice, just go back to step 9 and keep trying

So I cannot find any keyless pads that arent for 95+ sc's. There are some on ebay that are 'universal' will these work with this method? What if i bought a used cut key and swapped out my blade and then programmed it with this method?

Looking to spend under $100 on this!
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Old 03-01-10, 09:38 AM   #2
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Unfortunately the 92-94 SC's don't allow you to simply program a new remote. You have to purchase a set of two keys with remotes built in as well as a chip that is installed in the wireless door lock controller module. The remotes are locked to the frequency of the receiver chip in the door lock module, so if you buy another used remote it will not work without the corresponding receiver chip.

The part number is: 8970550944 which normally sells for anywhere from $200-300 for the set of remote keys and the receiver chip.

I found this one on eBay :http://cgi.ebay.com/ebaymotors/1990-...item3caaabb35a

There's no universal remote that I'm aware of that will work and those programming instructions are only for newer Lexus vehicles.

Was also discussed in this thread: https://www.clublexus.com/forums/sc-...y-92-sc-3.html

Last edited by Scotty; 03-01-10 at 09:51 AM.
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