Pinpoint Test L: The Power Liftgate Module Does Not Respond To The Diagnostic Tool

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

L1 CHECK ISO CIRCUIT 70 (LB/WH) BETWEEN THE POWER LIFTGATE MODULE C4174a AND THE DLC C251 FOR AN OPEN
- Key in OFF position. Disconnect: Power Liftgate Module C4174a.
- Measure the resistance between the power liftgate module C4174a-1, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side.
  
  Fig 1: Measuring Resistance Between Power Liftgate Module C4174a-1, Circuit 70 (LB/WH), Harness Side And The DLC C251-7, Circuit 70 (LB/WH), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to L2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
L2 CHECK FOR CORRECT POWER LIFTGATE MODULE OPERATION
- Disconnect all the power liftgate module connectors.
- Check for:
  - corrosion
  - push-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 SYSTEM - EXTERIOR . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

No

The system is operating correctly at this time. 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.