ClubLexus - Lexus Forum Discussion
0 2026/05/17 16:46:55
0 2026/05/17 16:46:52
Old orginal ECM had some kind of internal fault which didn't allow it to properly communicate with Techstream
Old orginal ECM had some kind of internal fault which didn't allow it to properly communicate with Techstream
0 2026/05/17 16:24:03
According to Google search the old ECM had internal failure
According to Google search the old ECM had internal failure
0 2026/05/17 16:21:05
0 2026/04/23 13:59:23
0 2026/04/23 13:56:47
The immobilizer ECU data list shows correct values that are within specifications. These data values have been consistently the same with the original "old" immo ECU as well as with replacement "used" immo ECU (after eeprom chip swap). I believe both immo ECU's are not the cause of my problem.
The immobilizer ECU data list shows correct values that are within specifications. These data values have been consistently the same with the original "old" immo ECU as well as with replacement "used" immo ECU (after eeprom chip swap). I believe both immo ECU's are not the cause of my problem.
0 2026/04/23 13:54:49
0 2026/04/23 13:51:29
The immobilizer ECU data list shows correct values that are within specifications. These data values have been consistently the same with the original "old" immo ECU as well as with replacement "used" immo ECU (after eeprom chip swap). I believe both immo ECU's are not the cause of my problem.
The immobilizer ECU data list shows correct values that are within specifications. These data values have been consistently the same with the original "old" immo ECU as well as with replacement "used" immo ECU (after eeprom chip swap). I believe both immo ECU's are not the cause of my problem.
0 2026/04/23 13:15:56
The immobilizer ECU shows no fault codes. All 3 keys work normally as in the red LED security light on the dash will stop blinking when key is inserted & blink when key is removed.
The immobilizer ECU shows no fault codes. All 3 keys work normally as in the red LED security light on the dash will stop blinking when key is inserted & blink when key is removed.
0 2026/04/23 13:15:53
I was able to use Techstream's VIN utility to successfully replace the VIN# of the donor car to my current VIN#.
I was able to use Techstream's VIN utility to successfully replace the VIN# of the donor car to my current VIN#.
0 2026/04/23 13:15:51
The Good news! No more having to manually select Year, Make, Model, VIn# on this screen. Appears this ECM has a functioning module that automatically relays this data into Techstream.
The Good news! No more having to manually select Year, Make, Model, VIn# on this screen. Appears this ECM has a functioning module that automatically relays this data into Techstream.
0 2026/04/23 13:15:49
Installed replacement "used" ECM with battery disconnected. Installed jumper between DLC pin 4/13 & let the dash blink for 1hr, turned off key, removed key from ignition, removed 4/13 jumper, inserted key and tried starting. Cranks, starts, cuts out after 1 sec., tried 2 more times but same. B2799 code is active in ECM. Cleared code but it comes back right away.
Installed replacement "used" ECM with battery disconnected. Installed jumper between DLC pin 4/13 & let the dash blink for 1hr, turned off key, removed key from ignition, removed 4/13 jumper, inserted key and tried starting. Cranks, starts, cuts out after 1 sec., tried 2 more times but same. B2799 code is active in ECM. Cleared code but it comes back right away.
0 2026/04/23 13:15:46
Took awhile but I found a matching 89661-0E042 ECM for an unbeatable price
Took awhile but I found a matching 89661-0E042 ECM for an unbeatable price
0 2026/04/23 13:15:44
Experienced Toyota tech posting solution to B2799 immo issue on diag.net
Experienced Toyota tech posting solution to B2799 immo issue on diag.net
0 2025/06/15 14:30:36
Experienced Toyota tech reporting B2799 immo issue on diag.net
Experienced Toyota tech reporting B2799 immo issue on diag.net
0 2025/06/15 14:30:31
Just this B2799 code that wont go away even when erasing code it comes right back. All 3 orginal factory keys work. Security light goes out when any key inserted and security light blinks when key removed
Just this B2799 code that wont go away even when erasing code it comes right back. All 3 orginal factory keys work. Security light goes out when any key inserted and security light blinks when key removed
0 2025/06/01 13:57:24
No DTC's stored in Transponder ECU
No DTC's stored in Transponder ECU
0 2025/06/01 13:57:22
All data list in Transponder ECU reads normal values
All data list in Transponder ECU reads normal values
0 2025/06/01 13:57:20
All modules accounted for and colored in "white"
All modules accounted for and colored in "white"
0 2025/06/01 13:57:18
Health check showed normal communication with all ECU's
Health check showed normal communication with all ECU's
0 2025/06/01 13:57:15
This is AllData. Mine is unset right now but unset means without key and set means Igniton switch on. This is the same as what is on Mitchell. Im trying to see what a running RX will show for this data list. Thanks!
This is AllData. Mine is unset right now but unset means without key and set means Igniton switch on. This is the same as what is on Mitchell. Im trying to see what a running RX will show for this data list. Thanks!
0 2025/05/14 14:53:29
0 2025/05/14 10:18:04
Strangly ECM isnt even mentioned as to how to diagnose and when to replace on this brief list of diag instructions. This is Mitchell and not Lexus repair manual
Strangly ECM isnt even mentioned as to how to diagnose and when to replace on this brief list of diag instructions. This is Mitchell and not Lexus repair manual
0 2025/05/14 09:46:01
Pin locations labeled
Pin locations labeled
0 2025/05/14 09:45:59
Test wiring between ECM and immo box
Test wiring between ECM and immo box
0 2025/05/14 09:45:57
Faulty ECM is the last on the list
Faulty ECM is the last on the list
0 2025/05/14 09:45:54
Immo box data stream. At the bottom there is zero DTC's. Going thru the data the immo is "UNSET" which is good. SET would mean security is actively preventing start up. Also permit start shows "OK". B+ shows "OK". Antenna coil status is "OK". Keys programmed shows 3 which is correct. All looks good as far so why the B2799 code
Immo box data stream. At the bottom there is zero DTC's. Going thru the data the immo is "UNSET" which is good. SET would mean security is actively preventing start up. Also permit start shows "OK". B+ shows "OK". Antenna coil status is "OK". Keys programmed shows 3 which is correct. All looks good as far so why the B2799 code
0 2025/05/13 18:29:05
89780-0E010 immo box is the original box that came with the vehicle as brand new. This board was easy to slide out of the black case so you can see the board by iteself. The 89780-48021 newer board is glued into the black case so i had to split the case.
89780-0E010 immo box is the original box that came with the vehicle as brand new. This board was easy to slide out of the black case so you can see the board by iteself. The 89780-48021 newer board is glued into the black case so i had to split the case.
0 2025/05/13 18:12:07
89780-48021 immo box looks very similar to the other immo box. The eeprom chips are both 93LC66A I/SN. Only difference i can see is at the bottom left of the board. It has a little extra component on bottom left.
89780-48021 immo box looks very similar to the other immo box. The eeprom chips are both 93LC66A I/SN. Only difference i can see is at the bottom left of the board. It has a little extra component on bottom left.
0 2025/05/13 18:12:04
Probing Transponder ECU CODE terminal #10 (LGT GRN)
Probing Transponder ECU CODE terminal #10 (LGT GRN)
0 2025/03/15 12:03:06
Probing Transponder ECU TXCT terminal #12 (BRN)
Probing Transponder ECU TXCT terminal #12 (BRN)
0 2025/03/15 12:00:13
This is probing Transponder ECU EFII terminal #7 (BLU)
This is probing Transponder ECU EFII terminal #7 (BLU)
0 2025/03/15 11:45:59
This is when probing Transponder ECU EFIO terminals #6 (GRY)
This is when probing Transponder ECU EFIO terminals #6 (GRY)
0 2025/03/15 11:43:35
0 2025/03/14 16:31:08
0 2025/03/14 16:31:04
0 2025/03/12 14:04:27
0 2025/03/12 14:04:25
0 2025/03/12 14:04:24
0 2025/03/12 14:04:22