HOW TO PROCEED WITH TROUBLESHOOTING
HINT
This ECU is connected to the multiplex communication system. Therefore, be sure to check that there is no trouble in the multiplex communication system before performing the troubleshooting.
Scheme 58
Scheme 59
Scheme 60
Scheme 61
Scheme 62
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| BDR <--> GND (B11-4 <--> B11-3) | L-W <--> W-B | Battery | Always | 10 to 14 V |
| BECU <--> GND (B11-5 <--> B11-3) | W-R <--> W-B | Battery | Always | 10 to 14 V |
| SIG <--> GND (B11-6 <--> B11-3) | B-R <--> W-B | Ignition switch | Ignition switch OFF | Below 1.0 V |
| SIG <--> GND (B11-6 <--> B11-3) | B-R <--> W-B | Ignition switch | Ignition switch ON | 10 to 14 V |
| LGLP <--> GND (B11-7 <--> B11-3) | R-L <--> W-B | Luggage room light | Luggage room light switch OFF or ON | Below 1.0 V |
| LGLP <--> GND (B11-7 <--> B11-3) | R-L <--> W-B | Luggage room light | Luggage room light switch DOOR, any door open | 10 to 14 V |
| BDCY <--> CTYE (B10-7 <--> B10-20) | R<--> W-B | Back door courtesy light switch | Back door courtesy ON (Back door Open) | Below 1.0 V |
| BDCY <--> CTYE (B10-7 <--> B10-20) | R <--> W-B | Back door courtesy light switch | OFF (Back door Close) | 10 to 14 V |
| BKUL <--> KEYE (B10-4 <--> B10-19) | G <--> R-W | Back door key lock and unlock switch (UNLOCK) | Back door key lock and unlock switch UNLOCK | Below 1.0 V |
| BKUL <--> KEYE (B10-4 <--> B10-19) | G <--> R-W | Back door key lock and unlock switch (UNLOCK) | Back door key lock and unlock switch OFF or LOCK | 10 to 14 V |
| BKL <--> KEYE (B10-5 <--> B10-19) | L <--> R-W | Back door key lock and unlock switch (LOCK) | Back door key lock and unlock switch LOCK | Below 1.0 V |
| BKL <--> KEYE (B10-5 <--> B10-19) | L <--> R-W | Back door key lock and unlock switch (LOCK) | Back door key lock and unlock switch OFF or UNLOCK | 10 to 14 V |
| BDUP <--> BDDN (B10-13 <--> B10-25) | P <-->W | Back door power window motor (UP) | Back door power window not operating | Below 1.0 V |
| BDUP <--> BDDN (B10-13 <--> B10-25) | P <--> W | Back door power window motor (UP) | Back door power window operating upward | 10 to 14 V |
| BDDN <--> BDUP (B10-25 <--> B10-13) | W <--> P | Back door power window motor (DOWN) | Back door power window not operating | Below 1.0 V |
| BDDN <--> BDUP (B10-25 <--> B10-13) | W <--> P | Back door power window motor (DOWN) | Back door power window operating downward | 10 to 14 V |
| LSWB <--> LSWE (B10-6 <--> B10-22) | R-L <--> R-Y | Back door unlock detection switch | Back door unlock detection switch ON (Back door lock unlocked) | Below 1.0 V |
| LSWB <--> LSWE (B10-6 <--> B10-22) | R-L <--> R-Y | Back door unlock detection switch | Back door unlock detection switch OFF (Back door lock locked) | 10 to 14 V |
| P <--> SGND (B10-12 <--> B10-18) | L-W <--> L-R | Rear wiper position switch | Rear wiper arm not in store position | 10 to 14 V |
| P <--> SGND (B10-12 <--> B10-18) | L-W <--> L-R | Rear wiper position switch | Rear wiper arm in store position | Below 1.0 V |
| SGND <--> Body ground (B10-18 <--> Body ground) | L-R <--> Body ground | Ground | Always | Below 1.0 V |
| W <--> SGND (B10-3 <--> B10-18) | L-B <--> L-R | Rear wiper reverse switch | Rear wiper arm not in stopping and reversing position | Below 1.0 V |
| W <--> SGND (B10-3 <--> B10-18) | L-B <--> L-R | Rear wiper reverse switch | Rear wiper arm between stopping and reversing position | 10 to 14 V |
| WIP- <--> SGND (B10-1 ohm B10-18) | L-O <--> L-R | Rear wiper motor | Rear wiper motor not operating | Below 1.0 V |
| WIP- <--> SGND (B10-1 ohm B10-18) | L-O <--> L-R | Rear wiper motor | Rear wiper motor rotates reversely | 10 to 14 V |
| WIP+ <--> SGND (B10-2 <--> B10-18) | L-Y <--> L-R | Rear wiper motor | Rear wiper motor not operating | Below 1.0 V |
| WIP+ <--> SGND (B10-2 <--> B10-18) | L-Y <--> L-R | Rear wiper motor | Rear wiper motor rotates | 10 to 14 V |
| GND <--> Body ground (B11-3 <--> Body ground) | W-B <--> Body ground | Ground | Always | Below 1.0 V |
| MPX1 ohm - (B11-2 <--> -) | LG-R <--> | Multiplex communication line | Multiplex communication circuit | |
| MPX2 <--> - (B11-1 ohm -) | B <--> | Multiplex communication line | Multiplex communication circuit | |
| ILE <--> GND (B11-8 <--> B11-3) | W <--> W-B | Illumination signal | Rear room light switch OFF | Below 1.0 V |
| ILE <--> GND (B11-8 <--> B11-3) | W <--> W-B | Illumination signal | Rear room light switch ON or DOOR | 10 to 14 V |
| ACT- <--> ACT+ (B10-14 <--> B10-15) | L-R <--> L-B | Back door lock motor | Back door lock motor not operating | Below 1.0 V |
| ACT- <--> ACT+ (B10-14 <--> B10-15) | L-R <--> L-B | Back door lock motor | Back door lock motor rotates reversely | 10 to 14 V |
| ACT+ <--> ACT-(B10-15 <--> B10-14) | L-B <--> L-R | Back door lock motor | Back door lock motor not operating | Below 1.0 V |
| ACT+ <--> ACT-(B10-15 <--> B10-14) | L-B <--> L-R | Back door lock motor | Back door lock motor rotates reversely | 10 to 14 V |
| DSV <--> DSG (B10-11 ohm B10-23) | LG-B <--> W-R | Back door power window pulse sensor | Ignition switch ON | 10 to 14 V |
| DS1 ohm GND (B10-17 <--> B11-3) | LG-R <--> W-B | Back door power window pulse sensor | Back door power window operating | Pulse generation (See waveform 1) |
| DS2 <--> GND (B10-16 <--> B11-3) | P <--> W-B | Back door power window pulse sensor | Back door power window operating | Pulse generation (See waveform 1) |
| DSG <--> Body ground (B10-23 <--> Body ground) | W-R <--> Body ground | Back door power window pulse sensor ground | Always | Below 1 V |
TERMINAL CONDITION SPECIFICATION CHART
Waveform 1
| Item | Condition |
|---|---|
| Tool setting | 5 V/DIV, 10 ms/DIV |
| Vehicle condition | Back door power window operating |
ITEM CONDITION CHART
Scheme 63
Scheme 64
- DATA LIST HINT: According to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one of the methods to shorten labor time. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. According to the display on the tester, read the DATA LIST. BACK-DOOR: *1: When the ignition key is not in the key cylinder and the back door is locked, turning and holding the back door key in the lock position for 1.5 seconds or more activates the back door ECU to operate the power window motor and close the power window. Similarly, turning and holding the back door key in the unlock position for 1.5 seconds or more when the back door is unlocked will open the power window.
- ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the methods to shorten labor time. It is possible to display the DATA LIST during the ACTIVE TEST. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. According to the display on the tester, perform the ACTIVE TEST. BACK-DOOR: ITEM CONDITION CHART Item Test details Diagnostic note P/W UP/DOWN Operate the back door power window motor UP/DOWN During this ACTIVE TEST, jam protection caught detection can be monitored. (Refer to the DATA LIST for details) DOOR LOCK Operate the door lock motor at rear door LOCK/UNLOCK - REAR WIPER Operate the rear wiper motor ON/OFF
Scheme 65
CIRCUIT DESCRIPTION
This circuit provides power to operate the back door ECU.
Scheme 66
INSPECTION PROCEDURE
- Check PWR No. 5, ECU-B, AM1 and ECU-IG fuse. CHECK: Check continuity of the PWR No. 5, ECU-B, AM1 and ECU-IG fuse. OK: Continuity NG: Replace the faulty fuse. OK: Go to next step.
- Check voltage between terminals, SIG, BDR, BECU and GND of back door ECU connector. PREPARATION: Turn the ignition switch ON. Disconnect the back door ECU connector. CHECK: Measure the voltage between terminals SIG, and GND of the back door ECU of the wire harness connector. OK: Voltage: 10 to 14 V PREPARATION: Turn the ignition switch OFF. CHECK: Measure the voltage between terminals BDR, BECU and GND of the back door ECU of the wire harness connector. OK: Voltage: 10 to 14 V OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check wire harness and connector between back door ECU and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Go to next step.
- Check wire harness and connector between back door ECU and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The back door courtesy light switch is built in the back door lock assembly.
This switch comes on when the back door is opened and goes off when the back door is closed.
Scheme 67
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the back door courtesy light switch using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, read the DATA LIST. BACK-DOOR: ITEM CONDITION CHART Item Measurement Item/Display (Range) Normal Condition Diagnostic Note COURTSY SW Back door courtesy light SW signal/ON or OFF ON: Back door is open - COURTSY SW Back door courtesy light SW signal/ON or OFF OFF: Back door is closed - OK: Indication on the tester switches between ON and OFF in accordance with the courtesy light switch status. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check back door courtesy light switch (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/interiorillumination-lights/#interior-light-system) ). NG: Replace the back door lock assy. OK: Go to next step.
- Check wire harness and connector between back door courtesy light switch and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
When the luggage room light and the rear room light are turned to the DOOR position, and any door is opened, voltage is applied to the LGLP terminal of the back door ECU, and voltage is output from the ILE terminal.
Scheme 68
- Check luggage room light (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/interiorillumination-lights/#interior-light-system) ). NG: Replace the luggage room light. OK: Go to next step.
- Check wire harness and connector between luggage room light and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Go to next step.
- Check wire harness and connector between luggage room light and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The door unlock detection switch is built in the door lock motor. This switch is ON when the door lock is in the unlock position and OFF when the door lock is in the lock position. The ECU detects the door lock conditions in this circuit. It is used as one of the operating conditions for the theft deterrent system.
Scheme 69
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the back door unlock detection switch using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, read the DATA LIST. BACK-DOOR: ITEM NORMAL DIAGNOSTIC CHART Item Measurement Item/Display (Range) Normal Condition Diagnostic Note LOCK POS SW Back door lock position SW signal/ON or OFF ON: Back door lock is in unlock position - LOCK POS SW Back door lock position SW signal/ON or OFF OFF: Back door lock is in lock position - OK: Indication on the tester switches between ON and OFF in accordance with the back door unlock detection switch status. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check back door unlock detection switch (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/door-locks-anti-theft-systems/#power-door-lock-control-system) ). NG: Replace the back door unlock detection switch. OK: Go to next step.
- Check wire harness and connector between back door unlock detection switch and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
When the back door ECU receives a LOCK/UNLOCK demand signal from the body ECU or back door key lock and unlock switch, etc., it operates the back door lock motor based on the signal.
Scheme 70
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the back door lock motor using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, perform the ACTIVE TEST. BACK-DOOR: ITEM NORMAL DIAGNOSTIC CHART Item Test details Diagnostic note DOOR LOCK Operate the door lock motor at rear door LOCK/UNLOCK - OK: Back door lock motor operates normally. OK: Proceed to next circuit inspection shown in problem symptom table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check back door lock motor (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/door-locks-anti-theft-systems/#power-door-lock-control-system) ). NG: Replace the back door lock motor. OK: Go to next step.
- Check wire harness and connector between back door lock motor and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The back door power window goes down when voltage is applied to the BDDN terminal of the back door ECU, and the window goes up when voltage is applied to the BDUP terminal.
Scheme 71
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the back door power window motor using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, perform the ACTIVE TEST. BACK-DOOR: ITEM NORMAL DIAGNOSTIC CHART Item Test details Diagnostic note P/W UP/DOWN Operate the back door power window Motor UP/DOWN During this ACTIVE TEST, jam protection caught detection can be monitored. OK: Back door power window operates normally. OK: Proceed to next circuit inspection shown in problem symptom table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check back door power window motor (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/windows/#back-door-power-window-control-system) ). NG: Replace the back door power window motor. OK: Go to next step.
- Check wire harness and connector between back door power window motor and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
Two pulse sensors are built into the back door power window motor. The back door ECU detects movement and position of the back door window based on information from these pulse sensors.
Scheme 72
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the back door power window pulse sensor using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, read the DATA LIST. BACK-DOOR: ITEM NORMAL CHART Item Measurement Item/Display (Range) Normal Condition Diagnostic Note PW POSITION Back door power window position/CLOSE or OPEN CLOSE: Back door power window is fully closed - PW POSITION Back door power window position/CLOSE or OPEN OPEN: Back door power window is opened - OK: Indication on the tester switches between CLOSE and OPEN in accordance with the back door power window status. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check back door power window pulse sensor (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/windows/#back-door-power-window-control-system) ). NG: Replace the back door power window regulator assembly. OK: Go to next step.
- Check wire harness and connector between back door power window pulse sensor and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The wiper motor is controlled by the back door ECU.
Scheme 73
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
- Check the rear wiper motor using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, perform the ACTIVE TEST. BACK-DOOR: ITEM NORMAL DIAGNOSTIC CHART Item Test details Diagnostic note REAR WIPER Operate the rear wiper motor ON/OFF - OK: Rear wiper motor operates normally. OK: Proceed to next circuit inspection shown in problem symptom table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check rear wiper motor (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/wiperwasher-systems/#wiper-system-washer-system) ). NG: Replace the rear wiper motor. OK: Go to next step.
- Check wire harness and connector between wiper motor and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The back door ECU operates the back door lock motor based on information from the back door key lock and unlock switch.
The back door power window goes up when the key is inserted into the cylinder and turned to the LOCK position. The window goes down when the key is turned to the UNLOCK position.
Scheme 74
HINT
When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2 .
Scheme 75
- Check the back door key lock and unlock switch using hand-held tester. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. CHECK: According to the display on the tester, read the DATA LIST. BACK-DOOR: OK: Indication on the tester switches between ON and OFF in accordance with the back door key lock and unlock switch status. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ). NG: Go to next step.
- Check the back door key lock and unlock switch (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/door-locks-anti-theft-systems/#power-door-lock-control-system) ). NG: Replace the back door key lock and unlock switch. OK: Go to next step.
- Check wire harness and connector between back door key lock and unlock switch and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
The rear wiper limit switch is built in to the rear wiper motor. The W built in switch of the rear wiper motor is ON when the rear wiper arm is in the position between stop and reverse and OFF when the rear wiper arm is in any other position. The P built in switch of the rear wiper motor is OFF when the rear wiper arm is in any position except stored and ON when the rear wiper arm is in the stored position.
Scheme 76
- Check rear wiper motor (See «INSPECTION»(/toyota/sequoia/i-2004-2007/remont/wiperwasher-systems/#wiper-system-washer-system) ). NG: Replace the rear wiper motor. OK: Go to next step.
- Check wire harness and connector between rear wiper motor and back door ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-227563-S16821795662006040600000) ). NG: Repair or replace wire harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227576-S29850591562006040600000) ).
See also:
• ADJUSTMENT
• INSPECTION
• INSPECTION
• INSPECTION
• INSPECTION