PRE-COLLISION SYSTEM TERMINALS OF ECU

CHECK DRIVING SUPPORT ECU ASSEMBLY

1. Measure the voltage and resistance according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   P62-7 (B) - P62-28 (GND)	LA-V - W-B	Power source	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   P62-3 (BZ) - P62-28 (GND)	LA-P - W-B	Pre-collision city buzzer output	Engine switch on (IG), buzzer not sounding	11 to 14 V
   			Engine switch on (IG), buzzer sounding	Below 1 V
   P62-28 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

2. Check for pulses according to the value(s) in the table below.

   Tech Tips

   If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the driving support ECU assembly is suspected.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   P62-8 (CA1P) - P62-28 (GND)	L - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
   P62-9 (CA1N) - P62-28 (GND)	W - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)
   P62-10 (CA2H) - P62-28 (GND)	R - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
   P62-11 (CA2L) - P62-28 (GND)	W - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)
   P62-12 (CA3H) - P62-28 (GND)	BE - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
   P62-13 (CA3L) - P62-28 (GND)	W - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)

   
   
   1. 

      *a	1 V/DIV.
      *b	10 μsec./DIV.

      WAVEFORM 1

      Item	Content
      Terminal Name	Between P62-8 (CA1P) - P62-28 (GND) Between P62-10 (CA2H) - P62-28 (GND) Between P62-12 (CA3H) - P62-28 (GND)
      Tester Range	1 V/DIV., 10 μsec./DIV.
      Condition	Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.

   2. 

      *a	1 V/DIV.
      *b	10 μsec./DIV.

      WAVEFORM 2

      Item	Content
      Terminal Name	Between P62-9 (CA1N) - P62-28 (GND) Between P62-11 (CA2L) - P62-28 (GND) Between P62-13 (CA3L) - P62-28 (GND)
      Tester Range	1 V/DIV., 10 μsec./DIV.
      Condition	Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.

CHECK MILLIMETER WAVE RADAR SENSOR

1. Measure the voltage and resistance according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   F1-8 (IGB) - F1-1 (SGND)	SB - W-B	Power source	Engine switch on (IG)	11 to 14 V
   F1-1 (SGND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

2. Check for pulses according to the value(s) in the table below.

   Tech Tips

   If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the millimeter wave radar sensor is suspected.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   F1-3 (CA2H) - F1-1 (SGND)	L - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
   F1-2 (CA2L) - F1-1 (SGND)	GR - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)
   F1-5 (CA1P) - F1-1 (SGND)	B - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 1)
   F1-6 (CA1N) - F1-1 (SGND)	W - W-B	CAN communication signal	Engine switch on (IG)	Pulse generation (See waveform 2)

   
   
   1. 

      *a	1 V/DIV.
      *b	10 μsec./DIV.

      WAVEFORM 1

      Item	Content
      Terminal Name	Between F1-3 (CA2H) and F1-1 (SGND) Between F1-5 (CA1P) and F1-1 (SGND)
      Tester Range	1 V/DIV., 10 μsec./DIV.
      Condition	Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.

   2. 

      *a	1 V/DIV.
      *b	10 μsec./DIV.

      WAVEFORM 2

      Item	Content
      Terminal Name	Between F1-2 (CA2L) and F1-1 (SGND) Between F1-6 (CA1N) and F1-1 (SGND)
      Tester Range	1 V/DIV., 10 μsec./DIV.
      Condition	Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.