- Back door lock
- Wire harness
- Power back door ECU
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Vehicle Exterior | Section: Door/Hatch | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002ADQ007X |
| Title: DOOR / HATCH: BACK DOOR CLOSER SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B2251 |
Back Door Closer Switch Malfunction |
DESCRIPTION
The power back door drive unit (power back door ECU) inputs signals from the full-latch switch, sector switch and back door courtesy light switch, which are built into the back door lock. Based on these switch signals, the latch position of the back door lock is determined.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2251 |
While back door closer is operating, malfunction is detected in position information from each switch within specified amount of time. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (HALF LATCH SW) |
(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 / Back Door / Data List /
(e) According to the display on the Techstream, read the Data List.
Back Door (Power Back Door ECU)
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Half Latch SW |
Latch switch signal / ON or OFF |
ON: Back door lock motor is open-latch or over-latch OFF: Back door lock motor is full-latch or half-latch |
- |
OK:
The display is as specified in the normal condition.
|
|
2. |
READ VALUE USING TECHSTREAM (BACK DOOR COURTESY LIGHT SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Back Door / Data List /
(e) According to the display on the Techstream, read the Data List.
Back Door (Power Back Door ECU)
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Courtesy SW |
Back door courtesy light switch signal / ON or OFF |
ON: Back door is open OFF: Back door is closed |
- |
OK:
The display is as specified in the normal condition.
|
|
3. |
CHECK HARNESS AND CONNECTOR (BACK DOOR ECU - POWER BACK DOOR ECU) |
(a) Disconnect the V2 back door ECU connector.
(b) Disconnect the O30 power back door ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
V2-17 (OCTY) - O30-20 (FUL) |
Always |
Below 1 Ω |
|
V2-17 (OCTY) or O30-20 (FUL) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the back door ECU connector.
(e) Reconnect the power back door ECU connector.
|
|
4. |
READ VALUE USING BACK DOOR ECU (BACK DOOR COURTESY LIGHT SWITCH) |
(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 / Back Door P/W / Data List /
(e) According to the display on the Techstream, read the Data List.
Back Door P/W (Back Door ECU)
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Back Door Courtesy SW |
Back door courtesy light switch signal / ON or OFF |
ON: Back door is open OFF: Back door is closed |
- |
OK:
The display is as specified in the normal condition.
|
|
5. |
INSPECT BACK DOOR LOCK (BACK DOOR COURTESY LIGHT SWITCH) |
(a) Remove the back door lock
.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Door Lock Latch Position |
Specified Condition |
|---|---|---|
|
6 (S) - 3 (E) |
Open-latch |
Below 1 Ω |
|
6 (S) - 3 (E) |
Half-latch |
Below 1 Ω |
|
6 (S) - 3 (E) |
Full-latch |
10 kΩ or higher |
|
6 (S) - 3 (E) |
Over-latch |
10 kΩ or higher |
|
|
6. |
CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - BACK DOOR ECU AND BODY GROUND) |
|
(a) Disconnect the V5 door lock connector. |
(b) Disconnect the V2 and V3 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
V5-6 (S) - V3-10 (BDCY) |
Always |
Below 1 Ω |
|
V5-3 (E) - V3-20 (CTYE) |
Always |
Below 1 Ω |
|
V2-6 (GND) - Body ground |
Always |
Below 1 Ω |
|
V5-6 (S) or V3-10 (BDCY) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the door lock and ECU connector.
|
|
7. |
REPLACE POWER BACK DOOR DRIVE UNIT |
(a) Temporarily replace the power back door drive unit with a new or normally functioning one
.
|
|
8. |
CLEAR DTC |
(a) Clear the DTCs
.
|
|
9. |
CHECK DTC OUTPUT |
(a) Check the DTCs
.
OK:
DTC not output B2251.
|
|
10. |
INSPECT BACK DOOR LOCK (LATCH SWITCH) |
(a) Remove the back door lock
.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Latch Switch
|
Tester Connection |
Door Lock Latch Position |
Specified Condition |
|---|---|---|
|
5 (CLS) - 3 (E) |
Open-latch |
Below 1 Ω |
|
5 (CLS) - 3 (E) |
Half-latch |
10 kΩ or higher |
|
5 (CLS) - 3 (E) |
Full-latch |
10 kΩ or higher |
|
5 (CLS) - 3 (E) |
Over-latch |
Below 1 Ω |
|
|
11. |
CHECK HARNESS AND CONNECTOR |
|
(a) Disconnect the V5 door lock connector. |
(b) Disconnect the O30, V2 and V3 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
V5-3 (E) - V3-20 (CTYE) |
Always |
Below 1 Ω |
|
V5-5 (CLS) - O30-22 (HAF) |
Always |
Below 1 Ω |
|
V2-6 (GND) - Body ground |
Always |
Below 1 Ω |
|
V5-5 (CLS) or O30-22 (HAF) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the door lock and ECU connector.
|
|
|