| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Door/Hatch | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000036BO003X |
| Title: DOOR / HATCH: POWER BACK DOOR SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Power Back Door cannot be Opened or Closed Using the Power Back Door Switch |
DESCRIPTION
When the power back door cannot be opened or closed using the power back door control switch, one of the following may be malfunctioning: 1) back door control switch circuit, 2) power back door drive unit (power back door ECU), or 3) main body ECU.
HINT:
Since the power back door system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List /
(e) According to the display on the Techstream, read the Data List.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Back Door Open SW |
Back door control switch / ON or OFF |
ON: Back door control switch is pushed OFF: Back door control switch is not pushed |
- |
OK:
The back door control switch functions as specified in the normal condition.
|
|
2. |
REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) |
(a) Temporarily replace the power back door drive unit (power back door ECU) with a new or normally functioning one
.
|
|
3. |
CHECK POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) |
(a) Check that the power back door operates normally.
OK:
It operates normally.
|
|
4. |
INSPECT POWER BACK DOOR OPENER / CLOSER SWITCH |
|
(a) Remove the back door control switch
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Position |
Specified Condition |
|---|---|---|
|
3 - 6 |
Back door control switch not pushed (OFF) |
10 kΩ or higher |
|
3 - 6 |
Back door control switch pushed (ON) |
Below 1 Ω |
(c) Reinstall the back door control switch.
|
|
5. |
CHECK HARNESS AND CONNECTOR (CONTROL SWITCH - MAIN BODY ECU AND BODY GROUND) |
|
(a) Disconnect the H70 switch connector. |
(b) Disconnect the H4 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H70-6 (CSW) - H4-26 (PBDS) |
Always |
Below 1 Ω |
|
H70-3 (E) - Body ground |
Always |
Below 1 Ω |
|
H70-6 (CSW) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the switch connector.
(e) Reconnect the ECU connector.
|
|
6. |
REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) |
(a) Replace the power back door drive unit (power back door ECU)
.
|
|
7. |
CHECK POWER BACK DOOR DRIVE UNIT |
(a) Check that the power back door operates normally.
OK:
It operates normally.
|
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