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How to reprogram a immobilizer on a lexus gs 400 1998?

Posted by paula marlowe on


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S. M. Nizam

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In my lexus gs300 i checked the immobilizer coil it dsnt get any voltage from the transponder key amplifier but the amplifier itself has 5 inputs and 2 outputs.
The outputs goes to coil which shows no voltage but among the 5 inputs 3 inputs has 12v and remaining 2 no voltages... I thought it might be key amplifier problem so i changed with new one... But it also gave the same voltages... So i don't know what next... Do u hv any idea how much the coil should get as a supply voltage and the 5 inputs for amplifier where does it come from.. If possible share block diagram for key amplifier..

Posted on Dec 31, 2020



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Hi Paula, I looked on YouTube and programing a Key to a lexus immobilizer looks fairly easy, The link below is that YouTube video,Also there's other lexus videos down the right side of the link that may help as well........CHEERS..
Lexus Remote Immobilizer Key Programming

Posted on May 01, 2016


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steve golladay

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SOURCE: The immobilizer for my 2001 Audi A3 needs to be reprogramed. How

This will require factory VAG software to complete. Local repair facility may be able to help if not then you will have to go to the dealer.

Posted on Apr 03, 2009

Rene J Solis

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SOURCE: what do I have to

Here are some things you should check to find out what the problem is:

  • Check transponder key coil. See TRANSPONDER KEY COIL TEST. If transponder key coil is okay, go to next step. Replace transponder key coil if necessary, and retest system operation.
TRANSPONDER KEY COIL TEST Check continuity between terminal No. 1 and No. 2. If continuity does not exist, replace transponder key coil.
  • Check circuits for faults between transponder key amplifier and ECM. See WIRING DIAGRAMS . If circuits are okay, go to next step. Repair or replace wiring as necessary, and retest system operation.
  • Replace transponder key amplifier. Check system operation. If system operates normally after replacing original transponder key amplifier, no further testing is required at this time.
  • If system still does not operate normally after replacing original transponder key amplifier, check ECM. See PIN VOLTAGE TESTS . If found to be defective, replace ECM and retest system operation.
  • Ensure ignition is on. Using a voltmeter, check voltage between ECM connector terminals.
  • If voltage is not as specified, repair wire harness or replace components as necessary.
  • If voltages are as specified, ECM may be faulty. See VOLTAGE TEST (GS300) table.
BETWEEN TERMINALS VOLTAGE E16-9 & E13-17 4.5 - 5.5 E16-10 & E13-17 10 - 14 E16-21 & E13-17 10 - 14 E16-22 & E13-17 10 - 14 E16-23 & E13-17 10 - 14
Related problems with vehicles equipped w/engine immobilizer system.

DTC B2797 sets when there is a signal being emitted from key but not being processed by transponder key amplifier. DTC indicates that problem is not w/key, but signal from key is not getting to PCM. Suspect harness, transponder amp or PCM.

Good Luck!! Keep me posted!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

Posted on Nov 19, 2010

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