Key Cannot be Registered [02/2019 - 10/2022]: Procedure

1. Check that the system enters registration mode.

   OK

   System enters registration mode.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. In registration mode, insert the door control transmitter assembly into the ignition key cylinder and check the combination meter assembly (security indicator light).

   HINT: 

   If the new key ID code registration fails, code 2-1 will be output through the security light. Trying to re-register an already registered door control transmitter assembly will cause code 2-2 to be output when the door control transmitter assembly is inserted. If the number of registered key ID codes exceeds the maximum limit, code 2-3 will be output through the combination meter assembly (security indicator light). The output details are shown in the following illustration.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Combination Meter Assembly (Security Indicator Light)	*b	Normal (Immobiliser system is operating normally)
   *c	Code 2-1	*d	Code 2-2
   *e	Code 2-3	*f	0.12 seconds
   *g	1.88 seconds	*h	0.25 seconds
   *i	0.5 seconds	*j	1 second

   Result

   Result	Proceed to
   Code 2-1 or Code 2-3 is output	A
   Code 2-2 is output	B

Result: 

B 

END (REGISTERED DOOR CONTROL TRANSMITTER ASSEMBLY WAS USED) 

Result: 

A 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Immobiliser / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Immobiliser > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Transponder M-code	Number of registered master keys	Min.: 0, Max.: 15	Number of registered master keys displayed	-

   Body Electrical > Immobiliser > Data List 

   Tester Display
   Transponder M-code

   Result

   Result	Proceed to
   5 is displayed for "Transponder M-code"	A
   Values are other than above	B

Result: 

A 

MAXIMUM NUMBER OF DOOR CONTROL TRANSMITTER ASSEMBLIES ALREADY REGISTERED 

Result: 

B 

See step  4

1. Refer to the table below to determine if additional door control transmitter assemblies can be registered.

   Number of Door Control Transmitter Assemblies Registered	Proceed to
   0	New key ID code registration
   1 to 4	Additional key ID code registration

2. Check if an additional door control transmitter assembly can be registered.

   OK

   Additional door control transmitter assembly can be registered.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (DOOR CONTROL TRANSMITTER ASSEMBLY MALFUNCTION) 

Result: 

NG 

REPLACE TRANSPONDER KEY ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022] 

1. Remove the unlock warning switch assembly.

   Refer to REMOVAL [11/2018 - ]

2. Inspect the unlock warning switch assembly.

   Refer to INSPECTION [11/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE UNLOCK WARNING SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  6

1. Disconnect the G52 transponder key ECU assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G29-1 - G52-5 (KSW)	Always	Below 1 Ω
   G29-2 - Body ground	Always	Below 1 Ω
   G29-1 or G52-5 (KSW) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSPONDER KEY ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR