Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

Suspension & Axle. Lexus Gs430, Gs300. Uzs190 Grs190
Tire And Wheel. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK TIRE PRESSURE WARNING LIGHT

CLEAR DTC

CHECK DTC

CHECK DTC

CHECK DTC

CHECK TIRE PRESSURE WARNING SWITCH MAIN POSITION

INSPECT TIRE PRESSURE MONITOR ECU

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TIRE SELECT SWITCH))

INSPECT TIRE SELECT SWITCH

CHECK HARNESS AND CONNECTOR (TIRE MONITOR RECEIVER ASSEMBLY - TIRE MONITOR ECU)

INSPECT TIRE PRESSURE MONITOR ECU

CHECK DTC

CHECK TIRE SELECT SWITCH 2ND POSITION

INSPECT TIRE PRESSURE MONITOR ECU

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TIRE SELECT SWITCH)

INSPECT TIRE SELECT SWITCH

CHECK HARNESS AND CONNECTOR (TIRE MONITOR RECEIVER ASSEMBLY - TIRE MONITOR ECU)

INSPECT TIRE PRESSURE MONITOR ECU

SET TIRE PRESSURE TO NORMAL VALUE

IDENTIFY TRANSMITTER CORRESPONDING TO DTC

INTERCHANGE TIRES

SET TIRE PRESSURE TO NORMAL VALUE

PERFORM FORCED TRANSMISSION OF TRANSMITTER ID

CHECK DTC AGAIN

DTC C2121/21 No Signal from Transmitter ID1 in Main Mode

DTC C2122/22 No Signal from Transmitter ID2 in Main Mode

DTC C2123/23 No Signal from Transmitter ID3 in Main Mode

DTC C2124/24 No Signal from Transmitter ID4 in Main Mode

DTC C2131/31 No Signal from Transmitter ID1 in 2nd Mode

DTC C2132/32 No Signal from Transmitter ID2 in 2nd Mode

DTC C2133/33 No Signal from Transmitter ID3 in 2nd Mode

DTC C2134/34 No Signal from Transmitter ID4 in 2nd Mode

DTC C2181/81 Transmitter ID1 not Received (Test Mode DTC)

DTC C2182/82 Transmitter ID2 not Received (Test Mode DTC)

DTC C2183/83 Transmitter ID3 not Received (Test Mode DTC)

DTC C2184/84 Transmitter ID4 not Received (Test Mode DTC)


DESCRIPTION

The tire pressure monitor valve sub-assembly constantly sends radio waves to the tire pressure monitor receiver assembly. If the battery for the tire pressure monitor valve sub-assembly is depleted, or if the tire pressure monitor receiver assembly is defective or comes off, the DTC will be output. DTCs C2121/21 to C2124/24 and C2131/31 to C2134/34 can only be deleted by the tester. DTCs C2181/81 to C2184/84 can be deleted when the transmitter sends a force transmission signal or the test mode ends. DTCs C2181/81 to C2184/84 are output only in the test mode.

DTC No.
DTC Detecting Condition
Trouble Area
C2121/21
C2122/22
C2123/23
C2124/24
C2131/31
C2132/32
C2133/33
C2134/34
These DTCs are detected when no signals are received for 51 minutes or more, after a vehicle speed of 5 mph (8 km/h) or more is detected and no signals are still received for 12 minutes or more.
  1. Tire pressure monitor receiver assembly
  2. Tire pressure monitor valve sub-assembly
  3. Tire select switch
  4. Tire pressure monitor ECU
  5. Wire harness
C2181/81
C2182/82
C2183/83
C2184/84
Malfunction in the transmitting/receiving circuit
  1. Tire pressure monitor receiver assembly
  2. Tire pressure monitor valve sub-assembly
  3. Tire select switch
  4. Tire pressure monitor ECU
  5. Wire harness
HINT:
It is necessary to perform the procedure to identify the tire pressure monitor valve sub-assembly that is malfunctioning because it cannot be identified by the output DTC.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode


INSPECTION PROCEDURE

NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub-assembly and/or the tire pressure monitor ECU (Click here ).
HINT:
Set the tire pressure to the specified value.
1.CHECK TIRE PRESSURE WARNING LIGHT

  1. Turn the engine switch on (IG).

  1. Check the tire pressure warning light.

    Result:

    Proceed to
    		Condition
    A
    		Does not blink
    B
    		Comes on and goes off repeatedly at 0.5 second intervals


B
Go to step 4
A


2.CLEAR DTC

NEXT


3.CHECK DTC

  1. Check for DTC.

    OK:
    DTC is not output.


NG
Go to step 4
OK

REFER TO PROBLEM SYMPTOMS TABLE

4.CHECK DTC

  1. Is DTC C2121/21, C2122/22, C2123/23 and C2124/24 output?



NO
Go to step 12
YES


5.CHECK DTC

  1. Are DTCs C2121/21, C2122/22, C2123 and C2124 all output?



NO
Go to step 19
YES


6.CHECK TIRE PRESSURE WARNING SWITCH MAIN POSITION
OK:
Tire pressure warning switch is set to "MAIN".
HINT:
If the tire pressure warning switch is not set to "MAIN", set the tire pressure to the specified value and set the tire pressure warning switch to the "MAIN". Afterwards, perform forced transmission of transmitter ID by rapidly reducing the all tire pressure and go to step 1.


NG
Go to step 1
OK


7.INSPECT TIRE PRESSURE MONITOR ECU


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Connect the tire pressure monitor ECU K45 connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K45-10 (RF5V) - K45-4 ((GND2)
    		Engine Switch on (IG)
    		4.5 to 5.5 V


OK
Go to step 10
NG


8.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TIRE SELECT SWITCH))


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect the tire pressure monitor ECU K45 connector and tire select switch K50 connector.



    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Specified Condition
    K45-3 (IDSW) - K50-2
    		Below 1 Ω
    K45-3 (IDSW) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.INSPECT TIRE SELECT SWITCH


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect tire select switch K50 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Switch Position
    		Tester Connection
    		Specified Condition
    MAIN
    		2 (INT) - 1 (E)
    		10 kΩ or higher
    2nd
    		2 (INT) - 1 (E)
    		Below 1 Ω


NG
REPLACE TIRE SELECT SWITCH
OK

REPLACE TIRE PRESSURE MONITOR ECU

10.CHECK HARNESS AND CONNECTOR (TIRE MONITOR RECEIVER ASSEMBLY - TIRE MONITOR ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect the tire pressure monitor receiver assembly W34 connector and tire pressure monitor ECU K45 connector.



    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Specified Condition
    K45-9 (RDA) - W34-1 (RDA)
    		Below 1Ω
    K45-10 (RF5V) - W34-5 (+5V)
    		Below 1Ω
    K45-4 (GND2) - W34-4 (GND)
    		Below 1Ω
    K45-9 (RDA) - Body ground
    		10 kΩ or higher
    K45-10 (RF5V) - Body ground
    		10 kΩ or higher
    K45-4 (GND2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.INSPECT TIRE PRESSURE MONITOR ECU
Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Connect the tire pressure monitor ECU K45 connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K45-10 (RF5V) - K45-4 (GND2)
    		Engine Switch on (IG)
    		4.5 to 5.5 V


NG
CHECK POWER SOURCE CIRCUIT
OK

REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY

12.CHECK DTC

  1. Are DTCs C2131/31, C2132/32, C2133/33 and C2134/34 all output?



NO
Go to step 19
YES


13.CHECK TIRE SELECT SWITCH 2ND POSITION
OK:
Tire select switch is set to "2nd".
HINT:
If the tire select switch is not set "2nd", set the tire pressure to the specified value and set the tire pressure warning switch to the "2nd". Afterward, perform forced transmission of transmitter ID by rapidly reducing the 4 tires pressure and go to step 1.


NG
Go to step 1
OK


14.INSPECT TIRE PRESSURE MONITOR ECU


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Connect the tire pressure monitor ECU K45 connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K45-10 (RF5V) - K45-4 (GND2)
    		Engine Switch on (IG)
    		4.5 to 5.5 V


OK
Go to step 17
NG


15.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TIRE SELECT SWITCH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect the tire pressure monitor ECU K45 connector and tire select switch K50 connector.



    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Specified Condition
    K45-3 (IDSW) - K50-2
    		Below 1Ω
    K45-3 (IDSW) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


16.INSPECT TIRE SELECT SWITCH


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect tire select switch K50 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Switch Position
    		Tester Connection
    		Specified Condition
    MAIN
    		2 (INT) -1 (E)
    		10 kΩ or higher
    2nd
    		2 (INT) -1 (E)
    		Below 1Ω


NG
REPLACE TIRE SELECT SWITCH
OK

REPLACE TIRE PRESSURE MONITOR ECU

17.CHECK HARNESS AND CONNECTOR (TIRE MONITOR RECEIVER ASSEMBLY - TIRE MONITOR ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect the tire pressure monitor receiver assembly W34 connector and tire pressure monitor ECU K45 connector.



    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Measure the resistance according to the value(s) in the table below.

    Tester Connection
    		Specified Condition
    K45-9 (RDA) - W34-1 (RDA)
    		Below 1Ω
    K45-10 (RF5V) - W34-5 (+5V)
    		Below 1Ω
    K45-4 (GND2) - W34-4 (GND)
    		Below 1Ω
    K45-9 (RDA) - Body ground
    		10 kΩ or higher
    K45-10 (RF5V) - Body ground
    		10 kΩ or higher
    K45-4 (GND2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


18.INSPECT TIRE PRESSURE MONITOR ECU


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Connect the tire pressure monitor ECU K45 connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K45-10 (RF5V) - K45-4 (GND2)
    		Engine Switch on (IG)
    		4.5 to 5.5 V


NG
CHECK POWER SOURCE CIRCUIT
OK

REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY

19.SET TIRE PRESSURE TO NORMAL VALUE

  1. Set the tire pressure of 4 wheels to the specified value.

    Tire Size
    		Front
    kPa (kgf/cm2, psi)
    		Rear
    kPa (kgf/cm2, psi)
    For driving at speeds under 160 km/h (100 mph)
    		For driving at speeds of 160 km/h (100 mph) or over
    		For driving at speeds under 160 km/h (100 mph)
    		For driving at speeds of 160 km/h (100 mph) or over
    245/40R 18
    		230 (2.3, 33)
    		260 (2.6. 38)
    270 (2.7, 39)*
    		230 (2.3, 33)
    260 (2.6. 38)*
    		270 (2.7, 39)
    310 (3.1, 45)*
    225/50R 17
    		230 (2.3, 33)
    		260 (2.6. 38)
    270 (2.7, 39)*
    		230 (2.3, 33)
    260 (2.6. 38)*
    		270 (2.7, 39)
    320 (3.2, 46)*
    *: When at least 4 people are in the vehicle.

NEXT


20.IDENTIFY TRANSMITTER CORRESPONDING TO DTC

NEXT


21.INTERCHANGE TIRES
HINT:
When "A" (left front) is identified at step 20:


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Interchange tire "A" with normal tire "B".


NEXT


22.SET TIRE PRESSURE TO NORMAL VALUE

  1. Set the tire pressure of 4 wheels to the specified value.

    Tire Size
    		Front
    kPa (kgf/cm2, psi)
    		Rear
    kPa (kgf/cm2, psi)
    For driving at speeds under 160 km/h (100 mph)
    		For driving at speeds of 160 km/h (100 mph) or over
    		For driving at speeds under 160 km/h (100 mph)
    		For driving at speeds of 160 km/h (100 mph) or over
    245/40R 18
    		230 (2.3, 33)
    		260 (2.6. 38)
    270 (2.7, 39)*
    		230 (2.3, 33)
    260 (2.6. 38)*
    		270 (2.7, 39)
    310 (3.1, 45)*
    225/50R 17
    		230 (2.3, 33)
    		260 (2.6. 38)
    270 (2.7, 39)*
    		230 (2.3, 33)
    260 (2.6. 38)*
    		270 (2.7, 39)
    320 (3.2, 46)*
    *: When at least 4 people are in the vehicle.

NEXT


23.PERFORM FORCED TRANSMISSION OF TRANSMITTER ID


    Lexus Gs430, Gs300. Uzs190 Grs190.Tire And Wheel.Tire And Wheel System. Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Remove the valve core of tire "A", rapidly reduce the tire pressure, and perform forced transmission of the transmitter ID of the tire pressure monitor valve sub-assembly.


NEXT


24.CHECK DTC AGAIN

  1. Check for DTC.

    OK:
    DTC is not output.
    HINT:
    1. If a DTC is output, replace the identified tire pressure monitor valve sub-assembly.
    2. Before installing a new tire pressure monitor valve sub-assembly, read and write down its transmitter ID.
    3. Register the transmitter ID after replacement, and then set the tire pressure to the specified value.


NG
REPLACE TIRE PRESSURE MONITOR VALVE SUB-ASSEMBLY
OK

REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY