Tire Pressure Warning Light Circuit: Procedure

1. Turn the ignition switch off.
2. Connect Techstream to the DLC3.
3. Turn the ignition switch on (IG) and turn the tester on.
4. Enter the following menus: Body / Combination Meter / Active Test.
5. Check the condition of the tire pressure warning light by operating the tester.
   COMBINATION METER
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Indicat. Tire Pressure Warning System	Tire Pressure Warning Light	Tire pressure warning light is OFF/ON	Confirm that the vehicle is stopped, engine idling

   OK

   The warning light turns on or off according to tester operation.

NG → See step   3 

OK: Go to next step 

1. Disconnect the D33 ECU connector.
   Fig 1: Checking Harness And Connector (Combination Meter - ECU And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E1 meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D33-5 (IND) - E1-33 (TIRE)	Always	Below 1 Ω
   D33-5 (IND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4