Terminals Of Ecu

Fig 1: Identifying Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Arrangement of telephone ECU assembly terminal.
   TERMINAL DESCRIPTION CHART
   
   

   Terminal No. (Symbol)	Wiring Color	Terminal Description
   P2-1 (+B)	G	Vehicle battery power supply
   P2-2 (SPO+)	W	Audio speaker output +
   P2-3 (SPO-)	B	Audio speaker output -
   P2-7 (MCVD)	Y	Microphone power supply
   P2-8 (MCI+)	G	Microphone input signal +
   P2-9 (MCI-)	R	Microphone input signal -
   P2-10 (SPI+)	W	Sound signal
   P2-11 (SPI-)	B	Sound signal
   P2-12 (E)	W-B	Ground
   P2-13 (IG2)	B	IG power supply
   P2-14 (ACC)	GR	ACC power supply
   P2-16 (GSW)	L	Airbag signal
   P2-17 (MCO+)	G	Microphone output
   P2-18 (MCO-)	R	Audio ground
   P2-19 (SGND)	Shielded	Shield ground
   P2-21 (HFOF)	B	Phone mute
   P2-22 (MUTE)	B	Radio mute
   P2-23 (MPX1)	B	MPX line
   P3-2 (BBI+)	R	Mayday battery input
   P3-4 (IND1)	L	Red LED output
   P3-5 (SIG1)	W	Mayday switch input
   P3-9 (BBI-)	L	Mayday battery input
   P3-11 (IND2)	P	Green LED output
   P3-12 (SIG-)	L	Mayday switch ground
   P3-13 (SIG2)	W	Mayday switch input
   P3-15 (SIL)	R	DLC3 line

2. Check telephone ECU assembly.
   1. Disconnect the P2 and P3 ECU connectors.
   2. Measure the resistance and voltage according to the value(s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION
      
      

      Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
      P2-12 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
      P2-1 (+B) - Body ground	G - Body ground	Vehicle battery power supply	Always	11 to 14 V
      P2-14 (ACC) - Body ground	GR - Body ground	ACC power supply	Engine switch on (ACC)	11 to 14 V
      P2-13 (IG2) - Body ground	B - Body ground	IG power supply	Engine switch on (IG)	11 to 14 V
      P2-10 (SPI+) - P2-12 (E)	W - W-B	Sound signal	Audio system playing	Waveform synchronized with sound is output
      P2-11 (SPI-) - P2-12 (E)	B - W-B	Sound signal	Audio system playing	Waveform synchronized with sound is output
      P2-21 (HFOF) - P2-12 (E)	B - W-B	Phone mute	Engine switch on (IG)	3.3 to 5.0 V
      P2-22 (MUTE) - P2-12 (E)	B - W-B	Radio mute	Engine switch on (IG)	3.3 to 5.0 V
      P3-2 (BBI+) - P3-9 (BBI-)	R - L	Non-rechargeable backup	Always	9 to 16 V
      P3-5 (SIG1) - P3-12 (SIG-)	W - L	Mayday switch input	Engine switch off, all buttons not pushed	4.4 to 5.0 kΩ
      P3-13 (SIG2) - P3-12 (SIG-)	W - L	Mayday switch input	Engine switch off, all buttons not pushed	4.4 to 5.0 kΩ

      If the result is not as specified, there may be a malfunction on the wire harness side.

   3. Disconnect the B telephone antenna (cellular phone) connector (color: blue) from the ECU.
   4. Measure the resistance according to the value(s) in the table below.

If the result is not as specified, there may be a malfunction on the antenna side.

Fig 2: Identifying P5 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the P5 ECU connector.
2. Measure the resistance and voltage according to the value(s) in the table below.
   RESISTANCE AND VOLTAGE SPECIFICATION
   
   

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   P5-4 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   P5-3 (+B) - Body ground	G - Body ground	Battery power supply	Always	11 to 14 V

   If the result is not as specified, there may be a malfunction on the wire harness side.

3. Reconnect the P5 ECU connector.
4. Measure the voltage according to the value(s) in the table below.

If the result is not as specified, the ECU may have a malfunction.