Theft Deterrent Keyless Entry. Engine Immobiliser System (W/O Entry And Start System) Key Cannot Be Registered

When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

1.CHECK REGISTRATION MODE

Check that the system enters registration mode.
OK:
System enters registration mode.

Go to step 5

OK

2.CHECK SECURITY INDICATOR LIGHT OPERATION

In registration mode, insert the key into the ignition key cylinder and check the 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 key will cause code 2-2 to be output when the key is inserted. If the number of registered key ID codes exceeds the maximum limit, code 2-3 will be output through the security indicator light. The output details are shown in the following illustration.

Text in Illustration
*1
Security Indicator Light
*2
Normal (Immobiliser system is operating normally)
*3
Code 2-1
*4
Code 2-2
*5
Code 2-3
-
-
Result
Result
Proceed to
Code 2-1 or code 2-3 is output
A
Code 2-2 is output
B

Text in Illustration
*1	Security Indicator Light	*2	Normal (Immobiliser system is operating normally)
*3	Code 2-1	*4	Code 2-2
*5	Code 2-3	-	-

END (REGISTERED KEY WAS USED)

A

3.READ VALUE USING GTS (TRANSPONDER S-CODE, TRANSPONDER M-CODE)

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Body Electrical / Immobiliser / Data List.

Read the Data List according to the display on the GTS.

Immobiliser
Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
Transponder S-code	Number of registered sub key / min. 0, max. 15	Number of registered sub key	-
Transponder M-code	Number of registered master key / min. 0, max. 15	Number of registered master key	-

Result
Result	Proceed to
5 is displayed for "Transponder M-code" and 0 is displayed for "Transponder S-code"	A
0 is displayed for "Transponder M-code" and 3 is displayed for "Transponder S-code"	B
5 is displayed for "Transponder M-code" and 3 is displayed for "Transponder S-code"	C
Values are other than above	D

KEY REGISTRATION (MASTER KEY)

MAXIMUM NUMBER OF KEYS ALREADY REGISTERED

Go to step 4

KEY REGISTRATION (SUB-KEY)

4.KEY REGISTRATION

Refer to the table below to determine if additional keys can be registered.
Number of Keys Registered (Master and Sub)
Proceed to
0
New key ID code registration
1 to 7
Additional key ID code registration

Check if an additional key can be registered.
OK:
Additional key can be registered.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

END (KEY MALFUNCTION)

5.INSPECT UNLOCK WARNING SWITCH ASSEMBLY

Remove the unlock warning switch assembly (LandCruiser RM000002ZQ604SX.html).

Inspect the unlock warning switch assembly (LandCruiser RM000002ZQ4034X.html).

REPLACE UNLOCK WARNING SWITCH ASSEMBLY (LandCruiser RM000002ZQ604SX.html)

OK

6.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - UNLOCK WARNING SWITCH ASSEMBLY AND BODY GROUND)

Disconnect the G3 unlock warning switch assembly connector.

Disconnect the G74 transponder key ECU assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
G3-1 - G74-3 (KSW)
Always
Below 1 Ω
G3-2 - Body ground
Always
Below 1 Ω
G3-1 - Body ground
Always
10 kΩ or higher
G74-3 (KSW) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (FOR DRIVER SIDE)

Remove the front door courtesy light switch assembly (for Driver Side) (LandCruiser RM000003YNE01PX.html).

Inspect the front door courtesy light switch assembly (for Driver Side) (LandCruiser RM000003YNC01XX.html).

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (FOR DRIVER SIDE) (LandCruiser RM000003YNE01PX.html)

OK

8.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY)

for LHD:
1. Disconnect the R7 front door courtesy light switch assembly LH connector.
2. Disconnect the G74 transponder key ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  G74-7 (CTY) - R7-1
  Always
  Below 1 Ω
  R7-1 - Body ground
  Always
  10 kΩ or higher
  G74-7 (CTY) - Body ground
  Always
  10 kΩ or higher

for RHD:
1. Disconnect the Q8 front door courtesy light switch assembly RH connector.
2. Disconnect the G74 transponder key ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  G74-7 (CTY) - Q8-1
  Always
  Below 1 Ω
  Q8-1 - Body ground
  Always
  10 kΩ or higher
  G74-7 (CTY) - Body ground
  Always
  10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TRANSPONDER KEY ECU ASSEMBLY

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

Number of Keys Registered (Master and Sub)	Proceed to
0	New key ID code registration
1 to 7	Additional key ID code registration

Tester Connection	Condition	Specified Condition
G3-1 - G74-3 (KSW)	Always	Below 1 Ω
G3-2 - Body ground	Always	Below 1 Ω
G3-1 - Body ground	Always	10 kΩ or higher
G74-3 (KSW) - Body ground	Always	10 kΩ or higher