PROBLEM SYMPTOMS TABLE Toyota Highlander II

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

ENGINE IMMOBILIZER SYSTEM

PROBLEM SYMPTOMS TABLE

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

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Scheme 25

Scheme 26

1. CHECK ENGINE SWITCH Disconnect the D25 engine switch connector. Measure the resistance according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D25-8 (AGND) - Body ground V - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the D25 engine switch connector. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D25-8 (AGND) - Body ground V - Body ground Ground Always Below 1 ohms D25-9 (TXCT) - D25-8 (AGND) O - V Key code output signal Key is not in cabin Below 1 V D25-9 (TXCT) - D25-8 (AGND) O - V Key code output signal Press engine switch and hold key close to engine switch* Pulse generation (See 1 waveform 1) D25-10 (CODE) - D25-8 (AGND) GR - V Demodulated signal of key code data Key is not in cabin Below 1 V D25-10 (CODE) - D25-8 (AGND) GR - V Demodulated signal of key code data Press engine switch and hold key close to engine switch* Pulse generation (see 2 waveform 2) D25-14 (VC5) - D25-8 (AGND) G - V Power supply Key is not in cabin Below 1 V D25-14 (VC5) - D25-8 (AGND) G - V Power supply Press engine switch 4.6 to 5.4 V HINT: *: Remove the key battery before performing this inspection. If the result is not as specified, the engine switch may have a malfunction. Inspect using an oscilloscope. Waveform 1 (Deference) WAVEFORM REFERENCE 1 Item Content Tester Connection D25-9 (TXCT) - D25-8 (AGND) Tool Setting 2 V/DIV, 50 ms/DIV Condition Press engine switch and hold key close to engine switch* HINT: *: Remove the key battery before performing this inspection. Waveform 2 (Reference) WAVEFORM REFERENCE 2 Item Content Tester Connection D25-10 (CODE) - D25-8 (AGND) Tool Setting 2 V/DIV, 50 ms/DIV Condition Press engine switch and hold key close to engine switch* HINT: *: Remove the key battery before performing this inspection.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the D40 certification ECU (smart key ECU assembly) connector. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D40-1 (+B) - D40-17 (E) B - B +B power supply Always 11 to 14 V D40-17 (E) - Body ground B - Body ground Ground Always Below 1 ohms D40-18 (IG) - D40-17 (E) G - B Ignition power supply Engine switch off Below 1 V D40-18 (IG) - D40-17 (E) G - B Ignition power supply Engine switch on (IG) 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the D40 certification ECU (smart key ECU assembly) connector. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D40-8 (TXCT) - D40-40 (AGND) O - V Engine switch TXCT output Key is not in cabin Below 1 V D40-8 (TXCT) - D40-40 (AGND) O - V Engine switch TXCT output Press engine switch and hold key close to engine switch* Pulse generation (See 1 waveform 1) D40-9 (CODE) - D40-40 (AGND) GR - V Engine switch CODE input Key is not in cabin Below 1 V D40-9 (CODE) - D40-40 (AGND) GR - V Engine switch CODE input Press engine switch and hold key close to engine switch* Pulse generation (See 2 waveform 2) D40-30 (VC5) - D40-40 (AGND) G - V Engine switch power supply Key is not in cabin Below 1 V D40-30 (VC5) - D40-40 (AGND) G - V Engine switch power supply Press engine switch 4.6 to 5.4 V D40-40 (AGND) - Body ground V - Body ground Engine switch ground Always Below 1 ohms HINT: *: Remove the key battery before performing this inspection. If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction. Inspect using an oscilloscope. Waveform 1 (Reference) WAVEFORM REFERENCE 1 Item Content Tester Connection D40-8 (TXCT) - D40-40 (AGND) Tool Setting 2 V/DIV, 50 ms /DIV Condition Press engine switch and hold key close to engine switch* HINT: *: Remove the key battery before performing this inspection. Waveform 2 (Reference) WAVEFORM REFERENCE 2 Item Content Tester Connection D40-9 (CODE) - D40-40 (AGND) Tool Setting 2 V/DIV, 50 ms./DIV Condition Press engine switch and hold key close to engine switch* HINT: *: Remove the key battery before performing this inspection.
3. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) Disconnect the D31 ID code box (immobilizer code ECU) connector. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D31-1 (+B) - D31-8 (GND) W - V +B power supply Always 11 to 14 V D31-8 (GND) - Body ground V - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the D31 ID code box (immobilizer code ECU) connector. Measure the voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D31-5 (EFII) - D31-8 (GND) BR - V ECM input signal Engine switch off Below 1 V D31-5 (EFII) - D31-8 (GND) BR - V ECM input signal Engine switch on (IG) Pulse generation (see 1 waveform 1) D31-6 (EFIO) - D31-8 (GND) L - V ECM output signal Engine switch off Below 1 V D31-6 (EFIO) - D31-8 (GND) L - V ECM output signal Engine switch on (IG) Pulse generation (see 2 waveform 2) If the result is not as specified, the ID code box (immobilizer code ECU) may have a malfunction. Inspect using an oscilloscope. Waveform 1 (Reference) WAVEFORM REFERENCE 1 Item Content Tester Connection D31-5 (EFII) - D31-8 (GND) Tool Setting 10 V/DIV., 100 ms /DIV. Condition Engine switch on (IG) Waveform 2 (Reference) WAVEFORM REFERENCE 2 Item Content Tester Connection D31-6 (EFIO) - D31-8 (GND) Tool Setting 10 V/DIV., 100 ms /DIV. Condition Engine switch on (IG)
4. CHECK STEERING LOCK ECU Disconnect the D11 steering lock ECU connector. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D11-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms D11-2 (SGND) - Body ground W - Body ground Ground Always Below 1 ohms D11-6 (IG2) - Body ground V - Body ground Ignition power supply Engine switch off Below 1 V D11-6 (IG2) - Body ground V - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V D11-7 (B) - Body ground G - Body ground +B power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
5. CHECK ECM Disconnect the B3 ECM connector and measure the resistance according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition B3-1 (E1) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the B3 ECM connector. Measure the voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE TABLE Tester Connection Wiring Color Terminal Description Condition Specified Condition D36-15 (IMO) - B3-1 (E1) BR - W-B Transponder key ECU output signal Engine switch off Below 1 V D36-15 (IMO) - B3-1 (E1) BR - W-B Transponder key ECU output signal Engine switch on (IG) Waveform 1 D36-16 (IMI) - B3-1 (E1) L - W-B Transponder key ECU input signal Engine switch off Below 1 V D36-16 (IMI) - B3-1 (E1) L - W-B Transponder key ECU input signal Engine switch on (IG) Waveform 2 If the result is not as specified, the ECM may have a malfunction. Inspect using an oscilloscope. Waveform 1 (Reference) WAVEFORM REFERENCE 1 Item Content Tester Connection D36-15 (IMO) - B3-1 (E1) Tool Setting 2 V/DIV., 1 s./DIV. Condition Engine switch on (IG) Waveform 2 (Reference) WAVEFORM REFERENCE 2 Item Content Tester Connection D36-16 (IMI) - B3-1 (E1) Tool Setting 2 V/DIV, 1 s/DIV. Condition Engine switch on (IG)
6. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) Disconnect the 1M and 1F junction block connectors. Disconnect the D7, D8 and D9 main body ECU (instrument panel junction block) connectors. Measure the resistance and voltage according to the value(s) in the table below. ECU TERMINALS REFERENCE Tester Connection Wiring Color Terminal Description Condition Specified Condition D7-1 (AM2) - Body ground G - Body ground +B power supply Always 11 to 14 V D8-6 (AM1) - Body ground GR - Body ground +B power supply Always 11 to 14 V D9-1 (GND3) - Body ground W-B - Body ground Ground Always Below 1 ohms 1M-9 (GND2) - Body ground W-B - Body ground Ground Always Below 1 ohms 1F-10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.