Pinpoint Test J: The Power Liftgate Module Does Not Respond To The Diagnostic Tool
WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- J1 CHECK THE POWER LIFTGATE MODULE C4174D FOR DAMAGE
- Key in OFF position.
- Disconnect: Power Liftgate Module C4174d.
- Inspect the power liftgate module C4174d for damage.
- Is the power liftgate module C4174d OK?
- Yes : GO to J2.
- No : REPAIR the power liftgate module C4174d. CARRY OUT the data link diagnostics test.
- J2 CHECK CIRCUITS 2180 (WH/BK) AND 2181 (BK/YE) BETWEEN THE POWER LIFTGATE MODULE C4174D AND THE DATA LINK CONNECTOR (DLC) C251 FOR AN OPEN
- Measure the resistance between the power liftgate module C4174d pin 20, circuit 2180 (WH/BK), harness side and the DLC C251 pin 3, circuit 2180 (WH/BK), harness side.
- Measure the resistance between the power liftgate module C4174d pin 19, circuit 2181 (BK/YE), harness side and the DLC C251 pin 11, circuit 2181 (BK/YE), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to J3.
- No : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
- J3 CHECK FOR CORRECT POWER LIFTGATE MODULE OPERATION
- Disconnect all the power liftgate module connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the power liftgate module 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 power liftgate module. REFER to BODY CLOSURES . CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the data link diagnostics test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.