BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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ARTICLE BEGINNING
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
This ECU is connected to the multiplex communication system. Therefore, be sure to check that
there is no troubles in the multiplex communication system before performing the troubleshooting.
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 1: Back Door Control System Troubleshooting Chart
CUSTOMER PROBLEM ANALYSIS CHECK
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 2: Back Door Control System Check Sheet
PARTS LOCATION
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 3: Identifying Back Door Control System Parts Location
TERMINALS OF ECU
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 4: Identifying Back Door Control System ECU Terminals
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 5: ECU Terminals Condition chart
PROBLEM SYMPTOMS TABLE
WIRELESS DOOR LOCK CONTROL
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 6: Wireless Door Lock Control Problem Symptoms Table
REAR WIPER AND WASHER
Fig. 7: Rear Wiper And Washer Problem Symptoms Table
CIRCUIT INSPECTION
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
This circuit provides power to operate the back door ECU.
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 8: Power Source Circuit
INSPECTION PROCEDURE
1. Check POWER and JCB M-fuses, and MPX-B and ECU-IG fuses.
CHECK:
Check the continuity of the POWER and JCB M-fuses, and MPX-B and ECU-IG fuse.
OK: Continuity
NG: Replace failure fuse.
OK: Go to next step.
2. Check voltage between terminals POWE/ECU-B/IG and GND of back door ECU
connector.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IG and GND.
OK: Voltage: 10-14 V
PREPARATION:
a. Turn the ignition switch OFF.
b. Disconnect the back door ECU connector. CHECK:
Measure the voltage between terminals POWE/ECU-B and GND.
OK: Voltage: 10-14 V
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
NG: Go to next step.
3. Check harness and connector between back door ECU and body ground ( ).
NG: Repair or replace harness or connector.
OK: Check and repair harness and connector between back door ECU and
battery.
BACK DOOR CONTROL SWITCH CIRCUIT
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 9: Back Door Control Switch Circuit
INSPECTION PROCEDURE
1. Check back door control switch ( ).
NG: Replace back door control switch.
OK: Go to next step.
2. Check harness and connector between back door control switch and back door ECU.
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
BACK DOOR COURTESY SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The back door courtesy switch is built in the back door lock.
This switch goes on when the back door is opened and goes off when back door is closed.
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 10: Back Door Courtesy Switch Circuit
INSPECTION PROCEDURE
1. Check back door courtesy switch ( ).
NG: Replace back door courtesy.
OK: Go to next step.
2. Check harness and connector between back door courtesy switch and back door ECU
( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
BACK DOOR UNLOCK DETECTION SWITCH CIRCUIT (W/ THEFT DETERRENT
SYSTEM)
CIRCUIT DESCRIPTION
The door unlock detection switch is built in the door lock motor assembly. This switch is ON when
the door lock knob is in the unlock position and OFF when the lock knob is in the lock position.
The ECU detects the door lock knob conditions is this circuit. It is used as one of the operating
conditions for the theft deterrent system.
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 11: Back Door Unlock Detection Switch Circuit (W/ Theft Deterrent System)
INSPECTION PROCEDURE
1. Check back door unlock detection switch ( ).
NG: Replace door lock motor.
OK: Go to next step.
2. Check harness and connector between door unlock detection switch and back door
ECU ( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
WINDOW LIMIT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This switch functions to turn "OFF" before the top dead center, and ECU reads this "OFF signal
resulting in closing the window fully.
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 12: Window Limit Switch Circuit
INSPECTION PROCEDURE
1. Check window limit switch ( ).
NG: Replace window limit switch.
OK: Go to next step.
2. Check harness and connector between window limit switch and back door ECU ( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
REAR WIPER LIMIT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
Rear wiper limit switch is built-in the rear wiper motor. LMT1 switch is ON when the rear wiper
arm is in the between stopping and reversing position and OFF when the rear wiper arm is in the
except between stopping and reversing position. LMT2 switch is ON when the rear wiper arm is in
the except storing position and OFF when the rear wiper arm is in the storing position.
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 13: Rear Wiper Limit Switch Circuit
INSPECTION PROCEDURE
1. Check rear wiper motor continuity ( ).
NG: Replace rear wiper motor.
OK: Go to next step.
2. Check harness and connector between rear wiper motor and back door ECU ( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
BACK DOOR POWER WINDOW MOTOR CIRCUIT
WIRING DIAGRAM
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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Fig. 14: Back Door Power Window Motor Circuit
INSPECTION PROCEDURE
1. Check back door power window motor ( ).
NG: Replace back door power window motor.
OK: Go to next step.
2. Check harness and connector between back door power window motor and back door
ECU ( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
REAR WIPER MOTOR CIRCUIT
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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CIRCUIT DESCRIPTION
Wiper motor is controlled by the back door ECU.
WIRING DIAGRAM
Fig. 15: Rear Wiper Motor Circuit
INSPECTION PROCEDURE
1. Check rear wiper motor ( ).
NG: Replace rear wiper motor.
OK: Go to next step.
2. Check harness and connector between wiper motor and back door ECU ( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
WIRELESS DOOR LOCK BUZZER CIRCUIT
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BACK DOOR CONTROL SYSTEM - DIAGNOSTICS -2001 Toyota 4Runner SR5
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WIRING DIAGRAM
Fig. 16: Wireless Door Lock Buzzer Circuit
INSPECTION PROCEDURE
1. Check wireless door lock buzzer ( ).
NG: Replace wireless door lock buzzer.
OK: Go to next step.
2. Check harness and connector between wireless door lock buzzer and back door ECU
( ).
NG: Repair or replace harness or connector.
OK: Proceed to next circuit inspection shown on problem symptoms table (See
PROBLEM SYMPTOMS TABLE ).
© 2008 Mitchell Repair Information Co., LLC.
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