TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

1. 

   Text in Illustration

   *A	except GRL10R-BEZQHQ and GRL11R-BETQHQ
   *B	for GRL10R-BEZQHQ and GRL11R-BETQHQ
   *a	Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

   Disconnect the tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.

   except GRL10R-BEZQHQ and GRL11R-BETQHQ

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   T32-1 (IG) - T32-12 (GND)	LG - W-B	IG power source	Engine switch on (IG)	10 to 16 V
   T32-7 (+B) - T32-12 (GND)	W - W-B	Power supply (from battery)	Always	10 to 16 V
   T32-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   for GRL10R-BEZQHQ and GRL11R-BETQHQ

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   U22-1 (IG) - U22-12 (GND)	L - W-B	IG power source	Engine switch on (IG)	10 to 16 V
   U22-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

2. Connect the tire pressure warning ECU and receiver connector.

3. Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may have a malfunction.

   Tech Tips

   Inspect the connectors from the back side while the connectors are connected.

   

   Text in Illustration

   *A	except GRL10R-BEZQHQ and GRL11R-BETQHQ	*B	for GRL10R-BEZQHQ and GRL11R-BETQHQ
   *a	Component with harness connected (Tire Pressure Warning ECU and Receiver)	-	-

   except GRL10R-BEZQHQ and GRL11R-BETQHQ

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   T32-3 (CLSW) - T32-12 (GND)	Y - W-B	Tire pressure warning reset switch	Engine switch on (IG) Tire pressure warning reset switch ON	Below 1.5 V
   			Engine switch on (IG) Tire pressure warning reset switch OFF	8 to 15 V
   T32-4 (RDA) - T32-12 (GND)	GR - W-B	Output signals	Engine switch on (IG)	Pulse generation (see waveform 1)
   T32-5 (PRG) - T32-12 (GND)	L - W-B	Input signals	Engine switch on (IG)	Pulse generation (see waveform 1)
   T32-8 (ALSI) - T32-12 (GND) (*)	V - W-B	Tire pressure monitor initiator driver	Engine switch on (IG)	Pulse generation (see waveform 1)

   
   

   • *: w/ Tire Inflation Pressure Display Function

   for GRL10R-BEZQHQ and GRL11R-BETQHQ

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   U22-3 (CLSW) - U22-12 (GND)	Y - W-B	Tire pressure warning reset switch	Engine switch on (IG) Tire pressure warning reset switch ON	Below 1.5 V
   			Engine switch on (IG) Tire pressure warning reset switch OFF	8 to 15 V
   U22-4 (RDA2) - U22-12 (GND)	GR - W-B	Output signals	Engine switch on (IG)	Pulse generation (see waveform 1)
   U22-5 (PRG2) - U22-12 (GND)	L - W-B	Input signals	Engine switch on (IG)	Pulse generation (see waveform 1)

4. 

   Text in Illustration

   *a	Example
   *b	GND

   Using an oscilloscope, check waveform 1.

   Waveform 1:

   Item	Contents
   Terminal	T32-4 (RDA) - T32-12 (GND)*1 T32-5 (PRG) - T32-12 (GND)*1 T32-8 (ALSI) - T32-12 (GND)*1 U22-4 (RDA2) - U22-12 (GND)*2 U22-5 (PRG2) - U22-12 (GND)*2
   Tool setting	5 V/DIV, 5 ms./DIV.
   Vehicle condition	Engine switch on (IG)

   
   

   • *1: except GRL10R-BEZQHQ and GRL11R-BETQHQ

   • *2: for GRL10R-BEZQHQ and GRL11R-BETQHQ

   Tech Tips

   The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.