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Tire Monitor System - Lamp Flashing/ON/DTC's Set

SUSPENSION
SU008-07

Title:
TIRE PRESSURE WARNING LIGHT
INTERMITTENTLY FLASHING OR "ON"

Models:
'07 Sienna

August 29, 2007

Introduction
Some 2007 model year Sienna vehicle customers may complain of an intermittently flashing Tire Pressure Warning System (TPWS) light that then turns "ON" with one or more of the following DTCs stored in the TPWS ECU:

^ C2121 Transmitter ID1

^ C2122 Transmitter ID2

^ C2123 Transmitter ID3

^ C2124 Transmitter ID4

The TPWS Receiver/Antenna and ECU Assemblies have been modified to correct this condition. Follow the appropriate repair procedures provided in this TSB.

Applicable Vehicles

^ 2007 model year Sienna vehicles produced BEFORE the Production Change Effective VINs shown below.





Production Change Information





Warranty Information

Applicable Warranty*:
This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date.

* Warranty application is limited to correction of a problem based upon a customer's specific complaint.





Parts Information





Required Tools & Equipment

Repair Procedure No. 1

NOTE:
BEFORE performing Repair Procedure No. 1, ensure that the VIN falls BEFORE the Production Change Effective VINs listed for Repair Procedure No. 1 in the Production Change Information table in this TSB.

1. Using TIS Techstream, confirm the condition by checking DTCs C2121 - C2124. System Select/Tire Pressure Monitor/Trouble Codes

^ If one or more DTCs C2121 - C2124 are present, go to step 2.

^ If other DTCs are present, refer to the Technical Information System (TIS), 2007 model year Sienna Repair Manual, Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning System: Diagnostic Trouble Code Chart".

2. Remove and replace the Tire Pressure Warning System Receiver/Antenna and ECU Assemblies (replace with NEW P/N 89760-08010 & 89769-08011).

Before removing the ECU, record all four Tire Pressure Warning Valve/Sensor ID numbers from the Tire Pressure Warning System ECU Data List using TIS Techstream.

Refer to TIS, 2007 model year Sienna Repair Manual:

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning Receiver (w/Antenna): Removal"

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning Receiver (w/Antenna): Installation"

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning ECU: Removal"

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning ECU: Installation"

3. Re-initialize any affected power systems.

Refer to TSB No. PD010-07, Power System Initialization During PDS".

4. Road test the vehicle for 20 minutes above 5 mph (8 km/h) to confirm that the Tire Pressure Warning Light does NOT come "ON". If the Tire Pressure Warning Light does come "ON" after 20 minutes of driving, repeat step 1.

NOTE:
If one or more DTCs C2121 - C2124 (Tire Pressure Warning Valve/Sensor ID Numbers Not Found) are stored in the ECU after replacing the Tire Pressure Warning System Receiver/Antenna and ECU Assembly, make sure that the tire pressure warning valve/sensor ID number(s) match the ID number(s) that are registered in the ECU. Refer to TSB No. PG004-06, "Direct-Type Tire Pressure Warning System Diagnostic Tips".

Repair Procedure No. 2

NOTE:
BEFORE performing Repair Procedure No. 2, ensure that the VIN falls BEFORE the Production Change Effective VINs listed for Repair Procedure No. 2 in the Production Change Information table in this TSB.

1. Using TIS Techstream, confirm the condition by checking DTCs C2121 - C2124. System Select/Tire Pressure Monitor/Trouble Codes

^ If all DTCs C2121 - C2124 are present, go to step 2.

^ If other DTCs are present, refer to TIS, 2007 model year Sienna Repair Manual, Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning System: Diagnostic Trouble Code Chart".

2. Remove and replace the Tire Pressure Warning System ECU Assembly (replace with NEW P/N 89769-08011).

Before removing the ECU, record all four Tire Pressure Warning Valve/Sensor ID numbers from the Tire Pressure Warning System ECU Data List using TIS Techstream.

Refer to TIS, 2007 model year Sienna Repair Manual:

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning ECU: Removal"

^ Suspension - Tire Pressure Monitoring - "Tire And Wheel: Tire Pressure Warning ECU: Installation"

3. Re-initialize any affected power systems.

Refer to TSB No. PD010-07, Power System Initialization During PDS".

4. Road test the vehicle for 20 minutes above 3 mph (5 km/h) to confirm that the Tire Pressure Warning Light does NOT come "ON". If the Tire Pressure Warning Light does come "ON" after 20 minutes of driving, repeat step 1.

If one or more DTCs C2121 - C2124 (Tire Pressure Warning Valve/Sensor ID Numbers Not Found) are stored in the ECU after replacing the Tire Pressure Warning System ECU Assembly, make sure that the tire pressure warning valve/sensor ID number(s) match the ID number(s) that are registered in the ECU. Refer to TSB No. PG004-06, "Direct-Type Tire Pressure Warning System Diagnostic Tips".
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