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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1719 (Body Panel System - Body Closures) >> Diagnostic Tests >> Luggage Compartment Lid >> Pinpoint Tests >> Pinpoint Test B: Luggage Compartment Lid Latch Opens, Lid Motor Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

The Liftgate/Trunk Module (LTM) receives voltage from the Battery Junction Box (BJB) through circuit 1190 (YE/BK) and grounds through circuit 57 (BK). The LTM receives a voltage signal from the Driver Door Module (DDM) when either the button on the driver door trim panel, the Remote Keyless Entry (RKE) keypad or the RKE transmitter is pressed (twice on the RKE transmitter). The luggage compartment lid latch release switch releases the lid latch when voltage is supplied to circuit 486 (BN/WH). The LTM supplies voltage to the luggage compartment lid release solenoid on circuit 605 (RD) releasing the luggage compartment lid, and to the lid motor through circuit 1600 (TN/RD) and grounds 1602 (WH/OG) on the luggage compartment lid motor to engage the clutch through 1609 (LG/YE) and move the lid to the full-open position. To close the luggage compartment lid, the motor is grounded on circuit 1600 (TN/RD) through the LTM and the clutch is grounded to circuits 1610 (WH/LB) and 57 (BK).

Optical sensors located on circuits 1617 (WH/LG) and 1618 (WH/BK) within the lid motor are monitored by the LTM to determine when to turn off power and which circuits should be powered or grounded to the lid motor. The sensors receive voltage on circuit 1615 (WH/YE) and ground on circuit 1616 (OG/LG).

When one of the buttons is pressed with the lid open, the DDM sends a signal to the LTM which supplies voltage to 1602 (WH/OG) and grounds circuit 1600 (TN/RD) to the lid motor and lowers the lid until the latch closes.

DTC Description Fault Trigger Conditions
  • B2418 - Sensor Power Short to Ground
 Sensor voltage less than 4 volts for 3 samples, 31 milliseconds apart.
  • B2419 - Sensor 1 Invalid
 Less than 2 pulse edges detected in 500 milliseconds.
  • B2420 - Sensor 2 Invalid
 Less than 2 pulse edges detected in 500 milliseconds.
  • B2703 - Open/Close Switch Stuck Active
 Open/close switch active for 5 minutes continuously while battery voltage greater than 8.5 volts.
  • B2718 - Liftgate/Decklid Ajar Output Short to Battery
 Output high when commanded low.
  • B2721 - Liftgate/Decklid Ajar Output Short to Ground or Open
 Output low when commanded high while ignition switch is ON and battery voltage greater than 10 volts.
  • B2748 - Left drive motor open circuit
 Motor current less than 3.4 amps at start of powered operation while no short to ground detected.
  • B2755 - Left drive short to battery
 Output inactive high.
  • B2757 - Left drive output short to ground
 Output inactive low.
  • B2825 - Movement ceased due to excessive speed deviation
 Obstacle detected (speed deviation).
  • B2908 - Latch Switch Invalid
 Latch switch inactive at start of self-test or end of self-test.
  • C1131 - Clutch Circuit Failure
 When outputs active, an open, short to battery, or overtemp condition exists due to greater than 8 amps current.

This pinpoint test is intended to diagnose the following:

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