Pinpoint Test B: The Courtesy Lamps Do Not Turn On With the Liftgate Or The Liftgate Glass Open
Interior Lighting
Pinpoint Tests
Pinpoint Test B: The Courtesy Lamps Do Not Turn On With the Liftgate Or The Liftgate Glass Open
Refer to Wiring Diagram Set 117 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage signal to the liftgate ajar switch through circuit CPL58 (GY/OG). The voltage signal passes through the liftgate ajar switch to the liftgate glass ajar switch through circuit CPL44 (YE/OG). The signal is then routed to ground through circuit GD182 (BK/GY).
The liftgate and the liftgate glass ajar switches are wired in series and are monitored from a single circuit by the SJB. The liftgate and liftgate glass ajar switches are closed when the liftgate and liftgate glass are closed. When the liftgate or liftgate glass is opened, the signal to ground is interrupted indicating an open liftgate or liftgate glass (the SJB cannot determine which is open).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Liftgate ajar switch (integrated into the liftgate latch)
- Liftgate glass ajar switch (integrated into the liftgate glass latch)
- SJB
PINPOINT TEST B: THE COURTESY LAMPS DO NOT TURN ON WITH THE LIFTGATE OR THE LIFTGATE GLASS OPEN
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the interior lamp switch is in the DOOR position before carrying out diagnostics.
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B1 CHECK THE COURTESY LAMP OPERATION FROM A DOOR
- Ignition OFF.
- Open any door and observe the courtesy lamps.
- Do the courtesy lamps illuminate?
Yes
GO to B2.
No
Go To Pinpoint Test A. Pinpoint Test A: The Courtesy Lamps Do Not Turn On With A Door Open
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B2 CHECK THE COURTESY LAMP OPERATION FROM THE LIFTGATE AND THE LIFTGATE GLASS
- Open then close the liftgate.
- Open then close the liftgate glass.
- Are the courtesy lamps inoperative from both the liftgate and the liftgate glass?
Yes
GO to B4.
No
If the courtesy lamps are inoperative from the liftgate, INSTALL a new liftgate ajar switch. TEST the system for normal operation.
If the courtesy lamps are inoperative from the liftgate glass, GO to B3.
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B3 CHECK THE COURTESY LAMP OPERATION FROM THE LIFTGATE AND THE LIFTGATE GLASS
- Disconnect: Liftgate Glass Ajar Switch C479.
- Do the courtesy lamps illuminate?
Yes
INSTALL a new liftgate glass latch. TEST the system for normal operation.
No
REPAIR circuit CPL44 (YE/OG) for a short to ground. TEST the system for normal operation.
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B4 CHECK THE LIFTGATE/LIFTGATE GLASS AJAR INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280c.
- Disconnect: Liftgate Ajar Switch C478.
- Measure the resistance between the liftgate ajar switch C478-2, circuit CPL58 (GY/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to B5.
No
REPAIR circuit CPL58 (GY/OG) for a short to ground. TEST the system for normal operation.
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B5 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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