TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

1. Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   O33-1 (IG) - O33-12 (GND)*1 N41-1 (IG) - N41-12 (GND)*2	V - BR	IG power source	Power switch on (IG)	10 to 16 V
   O33-4 (RDA) - O33-12 (GND)*1 N41-4 (RDA) - N41-12 (GND)*2	L - BR	Output signals	Power switch on (IG)	Pulse generation (see waveform 1)
   O33-5 (PRG) - O33-12 (GND)*1 N41-5 (PRG) - N41-12 (GND)*2	P - BR	Input signals	Power switch on (IG)	Pulse generation (see waveform 1)
   O33-12 (GND) - Body ground*1 N41-12 (GND) - Body ground*2	BR - Body ground	Ground	Always	Below 1 Ω

   
   

   • *1: w/o Intuitive Parking Assist System

   • *2: w/ Intuitive Parking Assist System

2. 

   Text in Illustration

   *a	Example
   *b	GND

   Using an oscilloscope, check waveform 1.

   Waveform 1:

   Item	Contents
   Terminal	O33-4 (RDA) - O33-12 (GND)*1 N41-4 (RDA) - N41-12 (GND)*2 O33-5 (PRG) - O33-12 (GND)*1 N41-5 (PRG) - N41-12 (GND)*2
   Tool setting	5 V/DIV, 50 μs./DIV.
   Vehicle condition	Power switch on (IG)

   
   

   • *1: w/o Intuitive Parking Assist System

   • *2: w/ Intuitive Parking Assist System

   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.