Last Modified: 4-30-2014 6.6 C Doc ID: RM0000018L9001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2121/21,...,C2185/85; No Signal from Transmitter ID1 in Main Mode; 2006 MY LX470 [05/2005 -        ]

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

C2125/25

No Signal from Transmitter ID5 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

C2135/35

No Signal from Transmitter ID5 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)

DTC

C2185/85

Transmitter ID5 not Received (Test Mode DTC)

DESCRIPTION

The tire pressure monitor valve sub-assembly constantly sends radio waves to the tire pressure monitor ECU. If the battery for the tire pressure monitor valve sub-assembly is depleted, or if the tire pressure antenna is defective or comes off, a DTC will be output. DTCs C2121/21 to C2125/25 and C2131/31 to C2135/35 can only be deleted by the tester. DTCs C2181/81 to C2185/85 can be deleted when the transmitter sends a forced transmission signal or the test mode ends. DTCs C2181/81 to C2185/85 are output only in the test mode.

DTC No.

DTC Detecting Condition

Trouble Area

C2121/21

C2122/22

C2123/23

C2124/24

C2125/25

C2131/31

C2132/32

C2133/33

C2134/34

C2135/35

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 received for 12 minutes or more.
  • Tire pressure monitor antenna
  • Tire pressure monitor valve sub-assembly
  • Tire pressure warning select switch
  • Tire pressure monitor ECU
  • Wire harness

C2181/81

C2182/82

C2183/83

C2184/84

C2185/85

Malfunction in the transmitting/receiving circuit
  • Tire pressure monitor antenna
  • Tire pressure monitor valve sub-assembly
  • Tire pressure warning select switch
  • Tire pressure monitor ECU
  • 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

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 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: REGISTRATION .

HINT:

Set the tire pressure to the specified value.

PROCEDURE

1.

CHECK TIRE PRESSURE WARNING LIGHT*1

(a) Turn the ignition switch ON.

(b) Check the tire pressure warning light.

Result

Condition

Proceed to

Does not blink

A

Comes on and goes off repeatedly at 0.5 second intervals

B
B

GO TO STEP 3

A

2.

CLEAR DTC

(a) Clear the DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

NEXT

3.

CHECK DTC

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

Result

Proceed to

DTCs C2121/21, C2122/22, C2123/23, C2124/24 and C2125/25 are all output

A

DTCs C2131/31, C2132/32, C2133/33, C2134/34 and C2135/35 are all output

B

DTC C2121/21, C2122/22, C2123/23, C2124/24 or C2125/25 is output

C

DTCs C2131/31, C2132/32, C2133/33, C2134/34 or C2135/35 is output

D

DTC is not output

E
B

GO TO STEP 19

C

GO TO STEP 13

D

GO TO STEP 13

E

END (Initial output was malfunction due to interference)

A

4.

CHECK TIRE PRESSURE WARNING SELECT SWITCH (MAIN POSITION)

OK:

Tire pressure warning select switch is set to "MAIN".

HINT:

If the tire pressure warning select switch is not set to "MAIN", set the tire pressure to the specified value and set the tire pressure warning select switch to "MAIN". Afterwards, perform forced transmission of the transmitter ID by rapidly reducing the pressure of all the tires and go to step *1.
NG

GO TO STEP 1

OK

5.

CHECK TEST MODE DTC

(a) Check for test mode DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: TEST MODE PROCEDURE .

Result

Result

Proceed to

C2195/95 output

A

C2195/95 not output

B
B

GO TO STEP 9

A

6.

CHECK WIRE HARNESS (ECU - ANTENNA)

(a) Disconnect the T36 ECU connector.

(b) Disconnect the T40 and T41 antenna connectors.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

T36-3 (ANTL) - T40-1

Below 1 Ω

T36-2 (ANTR) - T41-1

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

7.

REPLACE OUTER MIRROR RETRACTOR (TIRE PRESSURE ANTENNA)
NEXT

8.

CHECK DTC

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

OK:

DTC is not output.

OK

END

NG

9.

CHECK WIRE HARNESS (ECU - SELECT SWITCH)

(a) Disconnect the T35 ECU connector.

(b) Disconnect the T38switch connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

T35-7 (IDSW) - T38-2

Below 1 Ω

T35-7 (IDSW) - Body ground

10 kΩ or higher

T38-1 - Body ground

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

10.

INSPECT TIRE PRESSURE WARNING SELECT SWITCH

(a) Remove the select switch.

(b) Measure the resistance of the switch.

Standard resistance:

Tester Connection

Switch Position

Specified Condition

1 - 2

MAIN

10 kΩ or higher

1 - 2

2nd

Below 1 Ω
NG

REPLACE TIRE PRESSURE WARNING SELECT SWITCH

OK

11.

REPLACE TIRE PRESSURE MONITOR ECU
NEXT

12.

CHECK DTC

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

OK:

DTC is not output.

NG

REPLACE TIRE PRESSURE MONITOR VALVE SUB-ASSEMBLY

OK

13.

SET TIRE PRESSURE TO NORMAL VALUE

(a) Set the tire pressure of all wheels (including the spare tire) to the specified value.

Standard pressure

Front

Rear

Spare

200 kPa (2.0 kgf/cm 2 , 29 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

240 kPa (2.4 kgf/cm 2 , 35 psi)

240 kPa (2.4 kgf/cm 2 , 35 psi)

NEXT

14.

IDENTIFY TRANSMITTER CORRESPONDING TO DTC*2

(a) Identify transmitter corresponding to DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: Error in Present While Identifying Transmitter .

NEXT

15.

INTERCHANGE TIRES

(a) Interchange tire "A" (with a defective tire pressure monitor valve sub-assembly) with tire "B" (with a normal one).

HINT:

Perform this step if tire "A" (left front) is identified in step *2 above.

NEXT

16.

SET TIRE PRESSURE TO NORMAL VALUE

(a) Set the tire pressure of all wheels (including the spare tire) to the specified value.

Standard pressure

Front

Rear

Spare

200 kPa (2.0 kgf/cm 2 , 29 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

Trailer Towing

220 kPa (2.2 kgf/cm 2 , 32 psi)

240 kPa (2.4 kgf/cm 2 , 35 psi)

240 kPa (2.4 kgf/cm 2 , 35 psi)

NEXT

17.

FORCIBLY TRANSMISSION OF TRANSMITTER ID

(a) 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

18.

CHECK DTC AGAIN

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

OK:

DTC is not output.

HINT:

  • If a DTC is output, replace the identified tire pressure monitor valve sub-assembly.
  • Before installing a new tire pressure monitor valve sub-assembly, read and write down its transmitter ID.
  • 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 ECU

19.

CHECK TIRE PRESSURE WARNING SELECT SWITCH (2ND POSITION)

OK:

Tire pressure warning select switch is set to "2nd".

HINT:

If the tire pressure warning select switch is not set to "2nd", set the tire pressure to the specified value and set the tire pressure warning switch to "2nd". Afterward, perform forced transmission of the transmitter ID by rapidly reducing the pressure of all the tires (including the spare tire) and go to step *1.
OK

GO TO STEP 5

NG

GO TO STEP 1