Back Door Courtesy Switch Circuit
Circuit diagnosis
DESCRIPTION
w/o power back door system:The back door courtesy switch is built into the back door lock assembly. The switch turns on when the back door is opened and turns off when the door is closed. The body ECU applies voltage to the back door lock assembly via terminal BCTY. Back door open/close state signals are input to the body ECU.
w/ power back door system:
The back door courtesy switch is built into the back door lock assembly. The switch turns on when the back door is opened and turns off when the door is closed. The power back ECU applies voltage to the back door lock assembly via terminal CTYE. Back door open/close state signals are input to the power back door ECU. The back door ECU sends the back door open/close state signals to the body ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1. CHECK VEHICLE TYPE |
| Vehicle type |
Proceed to |
| w/o Power back door system |
A |
| w/ Power back door system |
B |
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| A | |
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| 2. INSPECT BACK DOOR LOCK ASSEMBLY |
Remove the back door lock assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Courtesy switch):
Tester Connection
Door Lock Latch Position
Specified Condition
1 - 2
Open-latch
Below 1 Ω
1 - 2
Half-latch
Below 1 Ω
1 - 2
Full-latch
10 kΩ or higher
1 - 2
Over-latch
10 kΩ or higher
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| OK | |
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| 3. CHECK WIRE HARNESS (BACK DOOR LOCK ASSEMBLY - INSTRUMENT PANEL J/B (BODY ECU)) |
Disconnect the back door lock assembly connector.
Disconnect the instrument panel J/B connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
Condition
Specified Condition
B11-1 - B7-25 (BCTY)
Always
Below 1 Ω
B11-2 - Body ground
Always
Below 1 Ω
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| OK | ||
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| 4. READ VALUE OF DATA LIST |
Check the DATA LIST to ensure proper operation of the back door courtesy switch.
Power back door ECU Item
Measurement Item /
Display (Range)
Normal Condition
Diagnostic Note
COURTESY SW
Back door courtesy switch signal (built in power back door lock)
/ON or OFF
ON: Driver side door is open
OFF: Driver side door is closed
-
- OK:
- The display is as specified in the normal condition.
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| OK | |
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| 5. CHECK WIRE HARNESS (POWER BACK DOOR ECU - INSTRUMENT PANEL J/B) |
Disconnect the power back door ECU connector.
Disconnect the instrument panel J/B connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
Condition
Specified Condition
P10-19 (CTYO) - B7-25 (BCTY)
Always
Below 1 Ω
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| OK | ||
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| 6. INSPECT BACK DOOR LOCK ASSEMBLY |
Remove the back door lock assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Courtesy switch):
Tester Connection
Door Lock Latch Position
Specified Condition
1 - 6
Open-latch
Below 1 Ω
1 - 6
Half-latch
Below 1 Ω
1 - 6
Full-latch
10 kΩ or higher
1 - 6
Over-latch
10 kΩ or higher
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| OK | |
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| 7. CHECK WIRE HARNESS (BACK DOOR LOCK ASSEMBLY - POWER BACK DOOR ECU) |
Disconnect the back door lock assembly connector.
Disconnect the power back door ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
Condition
Specified Condition
B12-1 - P10-7 (CTYE)
Always
Below 1 Ω
B12-6 - Body ground
Always
Below 1 Ω
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| OK | ||
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