- Back door lock
- Harness or connector
- Power back door unit
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Exterior | Section: Door/Hatch | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002ADQ006X |
| Title: DOOR / HATCH: POWER BACK DOOR SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B2251 |
Back Door Closer Switch Malfunction |
DESCRIPTION
The power back door unit (power back door ECU) inputs signals from the latch switch, closer position switch and back door courtesy 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 Code |
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 (LATCH SWITCH AND BACK DOOR COURTESY SWITCH) |
(a) Check the Data List for proper functioning of each switch.
Back Door
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Half Latch SW |
Latch switch signal/ON or OFF |
ON: Latch switch is ON OFF: Latch switch is OFF |
- |
|
Courtesy SW |
Back door courtesy switch signal/ON or OFF |
ON: Back door courtesy switch is ON OFF: Back door courtesy switch is OFF |
- |
OK:
The display is as specified in the normal condition.
|
|
2. |
INSPECT BACK DOOR LOCK ASSEMBLY (LATCH SWITCH AND BACK DOOR COURTESY 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 |
Condition |
Specified Condition |
|---|---|---|
|
5 (CLS) - 4 (E) |
Over-latch |
Below 1 Ω |
|
5 (CLS) - 4 (E) |
Full-latch |
10 kΩ or higher |
|
5 (CLS) - 4 (E) |
Half-latch |
10 kΩ or higher |
|
5 (CLS) - 4 (E) |
Open-latch |
10 kΩ or higher |
Back Door Courtesy Switch:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (CTY) - 4 (E) |
Over-latch |
10 kΩ or higher |
|
3 (CTY) - 4 (E) |
Full-latch |
10 kΩ or higher |
|
3 (CTY) - 4 (E) |
Half-latch |
Below 1 Ω |
|
3 (CTY) - 4 (E) |
Open-latch |
Below 1 Ω |
|
|
3. |
CHECK HARNESS AND CONNECTOR (LOCK - UNIT AND BODY GROUND) |
(a) Disconnect the S19 door lock connector.
(b) Disconnect the L36 unit connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
S19-5 (CLS) - L36-22 (HAF) |
Always |
Below 1 Ω |
|
S19-3 (CTY) - L36-20 (FUL) |
Always |
Below 1 Ω |
|
S19-4 (E) - Body ground |
Always |
Below 1 Ω |
|
S19-5 (CLS) - Body ground |
Always |
10 kΩ or higher |
|
S19-3 (CTY) - Body ground |
Always |
10 kΩ or higher |
|
|
|