ENGINE IMMOBILISER SYSTEM > TERMINALS OF ECU

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

   Inspection with Power Switch Off 

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H78-8 (AGND) - Body ground	-	P - Body ground	Ground	Always	Below 1 Ω	-
   H78-9 (TXCT) - H78-8 (AGND)	Input	V - P	Immobiliser communication input	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V	-
   H78-10 (CODE) - H78-8 (AGND)	Output	L - P	Immobiliser communication output	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V	-
   H78-14 (VC5) - H78-8 (AGND)	Input	Y - P	Transponder key amplifier power supply	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V	-

   
   

   Inspection of Waveforms of Communication Signals between Power Switch and Certification ECU (Smart Key ECU Assembly) 

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H78-9 (TXCT) - H78-8 (AGND)	Input	V - P	Signal input from certification ECU (smart key ECU assembly) (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into power switch, and then transmitted by antenna of transponder key amplifier as electric waves)	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed	Pulse generation (See waveform 1)	BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number (If immobiliser key code certification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above)
   H78-10 (CODE) - H78-8 (AGND)	Output	L - P	Signal output to certification ECU (smart key ECU assembly) (Electric waves from transponder key amplifier built into power switch used to detect key information. Information then sent to certification ECU (smart key ECU assembly))	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against power switch*	Pulse generation (See waveform 2)
   H78-14 (VC5) - H78-8 (AGND)	Input	Y - P	Transponder key amplifier power supply (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into power switch activated)	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed	Pulse generation (See waveform 3)

   HINT:

   *: Remove the key battery before performing this inspection.





2. Inspect using an oscilloscope.
   

   NOTICE:

   The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

   
   
   
   
   

   1. Waveform 1 (Reference)
      

      Measurement Condition 

      Item	Content
      Tester Connection	H78-9 (TXCT) - H78-8 (AGND)
      Tool Setting	2 V/DIV., 20 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

   
   
   

   2. Waveform 2 (Reference)
      

      Text in Illustration 

      *a	Key held against power switch

      Measurement Condition 

      Item	Content
      Tester Connection	H78-10 (CODE) - H78-8 (AGND)
      Tool Setting	1 V/DIV., 200 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against power switch*

      HINT:

      *: Remove the key battery before performing this inspection.

   
   
   

   3. Waveform 3 (Reference)
      

      Measurement Condition 

      Item	Content
      Tester Connection	H78-14 (VC5) - H78-8 (AGND)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

1. Disconnect the H1*1 or H143*2 ECU connector.
   

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

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

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H1-1 (+B) - H1-15 (E)*1 H143-1 (+B) - H143-15 (E)*2	Input	B - W-B	+B power supply	Power switch off	11 to 14 V	-
   H1-17 (CUTB) - H1-15 (E)*1 H143-17 (CUTB) - H143-15 (E)*2	Input	Y - W-B	Dark current cut pin*	Power switch off	11 to 14 V	-
   H1-15 (E) - Body ground*1 H143-15 (E) - Body ground*2	-	W-B - Body ground	Ground	Always	Below 1 Ω	-

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      
   1. *: In order to prevent the auxiliary battery from being discharged when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse between the auxiliary battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of electric waves every 250 ms. that form the detection area stops).
      
   If the result is not as specified, there may be a malfunction on the wire harness side.
   

3. Reconnect the H1*1 or H143*2 ECU connector.
   

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

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

   Inspection with Power Switch Off 

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H1-2 (IND) - H1-15 (E)*1 H143-2 (IND) - H143-15 (E)*2	Output	BR - W-B	Security indicator output	Power switch off → on (IG)	Pulse generation → Below 2 V	-
   H1-12 (TXCT) - H1-36 (AGND)*1 H143-12 (TXCT) - H143-36 (AGND)*2	Output	V - P	Signal output to transponder key amplifier	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V	BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number
   H1-13 (CODE) - H1-36 (AGND)*1 H143-13 (CODE) - H143-36 (AGND)*2	Input	L - P	Signal input from transponder key amplifier	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V
   H1-16 (IG) - H1-15 (E)*1 H143-16 (IG) - H143-15 (E)*2	Input	BE - W-B	Ignition power supply	Power switch off → on (IG)	Below 1 V → 11 to 14 V	Ignition Switch
   H1-28 (VC5) - H1-36 (AGND)*1 H143-28 (VC5) - H143-36 (AGND)*2	Output	Y - P	Transponder key amplifier power supply	Power switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed	Below 1 V	BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number
   H1-36 (AGND) - Body ground*1 H143-36 (AGND) - Body ground*2	-	P - Body ground	Transponder key amplifier ground	Always	Below 1 Ω

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      
   
   

   Inspection of Waveforms of Communication Signals between Power Switch and Certification ECU (Smart Key ECU Assembly) 

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H1-12 (TXCT) - H1-36 (AGND)*1 H143-12 (TXCT) - H143-36 (AGND)*2	Output	V - P	Signal output to transponder key amplifier (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into power switch, and then transmitted by antenna of transponder key amplifier as electric waves)	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed	Pulse generation (See waveform 1)	BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number
   H1-13 (CODE) - H1-36 (AGND)*1 H143-13 (CODE) - H143-36 (AGND)*2	Input	L - P	Signal input from transponder key amplifier (Electric waves from transponder key amplifier built into power switch used to detect key information. Information then sent to certification ECU (smart key ECU assembly))	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against power switch*	Pulse generation (See waveform 2)
   H1-28 (VC5) - H1-36 (AGND)*1 H143-28 (VC5) - H143-36 (AGND)*2	Output	Y - P	Transponder key amplifier power supply (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into power switch activated)	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed	Pulse generation (See waveform 3)

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

   HINT:

   *: Remove the key battery before performing this inspection.





5. Inspect using an oscilloscope.
   

   NOTICE:

   The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

   
   
   
   
   

   1. Waveform 1 (Reference)
      

      Measurement Condition 

      Item	Content
      Tester Connection	H1-12 (TXCT) - H1-36 (AGND)*1 H143-12 (TXCT) - H143-36 (AGND)*2
      Tool Setting	2 V/DIV., 20 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      1. *1: w/ Entry Function
         
      2. *2: w/o Entry Function
         

   
   
   

   2. Waveform 2 (Reference)
      

      Text in Illustration 

      *a	Key held against power switch

      Measurement Condition 

      Item	Content
      Tester Connection	H1-13 (CODE) - H1-36 (AGND)*1 H143-13 (CODE) - H143-36 (AGND)*2
      Tool Setting	1 V/DIV., 200 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against power switch*

      1. *1: w/ Entry Function
         
      2. *2: w/o Entry Function
         

      HINT:

      *: Remove the key battery before performing this inspection.

   
   
   

   3. Waveform 3 (Reference)
      

      Measurement Condition 

      Item	Content
      Tester Connection	H1-28 (VC5) - H1-36 (AGND)*1 H143-28 (VC5) - H143-36 (AGND)*2
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	After power switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      1. *1: w/ Entry Function
         
      2. *2: w/o Entry Function
         

1. Disconnect the H22 box connector.
   

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

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H22-1 (+B) - H22-8 (GND)	Input	L - W-B	+B power supply	Power switch off	11 to 14 V	B2789
   H22-8 (GND) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	B2789

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

3. Reconnect the H22 box connector.
   

4. Measure the voltage according to the value(s) in the table below.
   
   

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   H22-5 (EFII) - H22-8 (GND)	Input	L - W-B	EFI communication input (Signal input from power management control ECU to ID code box (immobiliser code ECU))	Power switch off	11 to 14 V	B2799 B279A Engine Start Request EFI Code Receive
   H22-5 (EFII) - H22-8 (GND)	Input	L - W-B	EFI communication input (Signal input from power management control ECU to ID code box (immobiliser code ECU))	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected	Pulse generation (See waveform 1)
   H22-6 (EFIO) - H22-8 (GND)	Output	R - W-B	EFI communication output (Signal output from ID code box (immobiliser code ECU) to power management control ECU)	Power switch off	11 to 14 V
   H22-6 (EFIO) - H22-8 (GND)	Output	R - W-B	EFI communication output (Signal output from ID code box (immobiliser code ECU) to power management control ECU)	Power switch on (IG)	Pulse generation (See waveform 2)





5. Inspect using an oscilloscope.
   

   NOTICE:

   The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

   
   
   
   
   

   1. Waveform 1 (Reference)
      

      
      
      
      
      

      Text in Illustration 

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      Measurement Condition 

      Item	Content
      Tester Connection	H22-5 (EFII) - H22-8 (GND)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

   
   
   

   2. Waveform 2 (Reference)
      

      
      
      
      
      

      Text in Illustration 

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      Measurement Condition 

      Item	Content
      Tester Connection	H22-6 (EFIO) - H22-8 (GND)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Power switch on (IG)

1. Disconnect the A21 and A22 ECU connectors.
   

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

   HINT:

   Measure the values on the wire harness side with the connectors disconnected.

   
   

   Tester Connection	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   A22-1 (E1) - Body ground	-	BR - Body ground	Ground	Always	Below 1 Ω	-
   A22-5 (E02) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   A22-6 (E01) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   A21-16 (+B) - Body ground	Input	GR - Body ground	+B power supply	Power switch off	11 to 14 V	-
   A21-15 (BATT) - Body ground	Input	SB - Body ground	+B power supply	Power switch off	11 to 14 V	-

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

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

   Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item/DTC
   A19-2 (+B2) - H3-5 (E01)	Input	L - W-B	Ignition power supply	Power switch on (IG)	11 to 14 V	-
   A20-5 (+B1) - H3-5 (E01)	Input	L - W-B	Ignition power supply	Power switch on (IG)	11 to 14 V	-
   A20-6 (MREL) - H3-5 (E01)	Input	BE - W-B	Ignition power supply	Power switch on (IG)	11 to 14 V	-
   H3-1 (AM22) - H3-6 (E1)	Input	W - W-B	+B power supply	Power switch off	11 to 14 V	-
   H3-5 (E01) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   H3-6 (E1) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   H4-4 (E12) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   H4-5 (E02) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
   H4-7 (AM21) - H3-6 (E1)	Input	W - W-B	+B power supply	Power switch off	11 to 14 V	-
   H4-20 (IMO) - H3-6 (E1)	Input	L - W-B	ID code box (immobiliser code ECU) communication input	Power switch off	11 to 14 V	-
   H4-20 (IMO) - H3-6 (E1)	Input	L - W-B	ID code box (immobiliser code ECU) communication input	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected	Pulse generation (See waveform 1)	-
   H4-21 (IMI) - H3-6 (E1)	Output	R - W-B	ID code box (immobiliser code ECU) communication output	Power switch off	11 to 14 V	-
   H4-21 (IMI) - H3-6 (E1)	Output	R - W-B	ID code box (immobiliser code ECU) communication output	Power switch on (IG)	Pulse generation (See waveform 2)	-





2. Inspect using an oscilloscope.
   

   NOTICE:

   The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

   
   
   
   
   

   1. Waveform 1 (Reference)
      

      
      
      
      
      

      Text in Illustration 

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      Measurement Condition 

      Item	Content
      Tester Connection	H4-20 (IMO) - H3-6 (E1)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

   
   
   

   2. Waveform 2 (Reference)
      

      
      
      
      
      

      Text in Illustration 

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      Measurement Condition 

      Item	Content
      Tester Connection	H4-21 (IMI) - H3-6 (E1)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Power switch on (IG)