Pinpoint Test B : The Liftgate Unlatches But The Power Liftgate Is Inoperative

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE OPERATION OF ALL THE POWER LIFTGATE INPUTS
- Ignition ON.
- Select PARK.
- Unlock the doors using the door lock control switch.
- Close the liftgate to the full closed position (manually if necessary).
- Open and close the power liftgate using the front interior power liftgate switch (located on the instrument panel).
- Open and close the power liftgate using a programmed RKE transmitter.
- Open the power liftgate using the exterior liftgate release switch.
- Close the power liftgate using the rear interior power liftgate switch (located on the bottom of the liftgate trim panel).
Does the power liftgate power open or power close from any input?

Yes GO to the Symptom Chart and DIAGNOSE the correct symptom.

No GO to B2

B2 CHECK FOR COMMUNICATION TO THE RGTM (REAR GATE TRUNK MODULE)
- Using a diagnostic scan tool, carry out the network test.
Does the RGTM pass the network test?

Yes GO to B3

No REFER to: Communications Network .

B3 CHECK FOR RGTM (REAR GATE TRUNK MODULE) COMMUNICATION AND VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, carry out the RGTM self-test.

Is DTC U0101:87, U0140:87, U0294:87, U3003:16 or U3003:17 present?

Yes	For DTC U0101:87, GO to Pinpoint Test L For DTC U0140:87, GO to Pinpoint Test M For DTC U0294:87, GO to Pinpoint Test N For DTC U3003:16, GO to Pinpoint Test O For DTC U3003:17, GO to Pinpoint Test P

GO to B4

B4 CHECK FOR POWER LIFTGATE MOTOR DIAGNOSTIC TROUBLE CODES (DTCS)
- View the results from the RGTM self-test.
Is DTC B144F:11, B144F:12, B144F:13, B144F:79, B1557:11, B1557:12, B1557:13 or B1515:97 present?

Yes GO to B5

No GO to B9

B5 CHECK THE POWER LIFTGATE MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect RGTM C4174A .

Disconnect Suspect Power Liftgate Motor.

Ignition ON.

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-2	Courtesy of FORD MOTOR COMPANY	Ground
C4527-9	Courtesy of FORD MOTOR COMPANY	Ground

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-2	Courtesy of FORD MOTOR COMPANY	Ground
C4528-9	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.

GO to B6

B6 CHECK THE POWER LIFTGATE MOTOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-2	Courtesy of FORD MOTOR COMPANY	Ground
C4527-9	Courtesy of FORD MOTOR COMPANY	Ground

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-2	Courtesy of FORD MOTOR COMPANY	Ground
C4528-9	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to B7

No	REPAIR the circuit in question.

B7 CHECK THE POWER LIFTGATE MOTOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-2	Courtesy of FORD MOTOR COMPANY	C4527-9

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-2	Courtesy of FORD MOTOR COMPANY	C4528-9

Is the resistance greater than 10, 000 ohms?

Yes

GO to B8

No	REPAIR the circuits.

B8 CHECK THE POWER LIFTGATE MOTOR CIRCUITS FOR AN OPEN

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-2	Courtesy of FORD MOTOR COMPANY	C4174A-5
C4527-9	Courtesy of FORD MOTOR COMPANY	C4174A-6

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-2	Courtesy of FORD MOTOR COMPANY	C4174A-11
C4528-9	Courtesy of FORD MOTOR COMPANY	C4174A-12

Are the resistances less than 3 ohms?

Yes

GO to B10

No	REPAIR the circuit in question.

B9 CHECK FOR POWER LIFTGATE MOTOR SENSOR DIAGNOSTIC TROUBLE CODES (DTCS)
- View the results from the RGTM self-test.
Is DTC B144D:29, B144E:29, B1A59:11, B1A59:13, B1555:29 or B1556:29 present?

Yes GO to B10

No GO to B14

B10 CHECK THE POWER LIFTGATE MOTOR SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect RGTM C4174B .

Disconnect Suspect Power Liftgate Motor.

Ignition ON.

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-4	Courtesy of FORD MOTOR COMPANY	Ground
C4527-5	Courtesy of FORD MOTOR COMPANY	Ground
C4527-6	Courtesy of FORD MOTOR COMPANY	Ground
C4527-7	Courtesy of FORD MOTOR COMPANY	Ground

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-4	Courtesy of FORD MOTOR COMPANY	Ground
C4528-5	Courtesy of FORD MOTOR COMPANY	Ground
C4528-6	Courtesy of FORD MOTOR COMPANY	Ground
C4528-7	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.

GO to B11

B11 CHECK THE POWER LIFTGATE MOTOR SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-4	Courtesy of FORD MOTOR COMPANY	Ground
C4527-5	Courtesy of FORD MOTOR COMPANY	Ground
C4527-6	Courtesy of FORD MOTOR COMPANY	Ground
C4527-7	Courtesy of FORD MOTOR COMPANY	Ground

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-4	Courtesy of FORD MOTOR COMPANY	Ground
C4528-5	Courtesy of FORD MOTOR COMPANY	Ground
C4528-6	Courtesy of FORD MOTOR COMPANY	Ground
C4528-7	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to B12

No	REPAIR the circuit in question.

B12 CHECK THE POWER LIFTGATE MOTOR SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-6	Courtesy of FORD MOTOR COMPANY	C4527-7
C4527-6	Courtesy of FORD MOTOR COMPANY	C4527-4
C4527-6	Courtesy of FORD MOTOR COMPANY	C4527-5
C4527-7	Courtesy of FORD MOTOR COMPANY	C4527-4
C4527-7	Courtesy of FORD MOTOR COMPANY	C4527-5
C4527-4	Courtesy of FORD MOTOR COMPANY	C4527-5

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-6	Courtesy of FORD MOTOR COMPANY	C4528-7
C4528-6	Courtesy of FORD MOTOR COMPANY	C4528-4
C4528-6	Courtesy of FORD MOTOR COMPANY	C4528-5
C4528-7	Courtesy of FORD MOTOR COMPANY	C4528-4
C4528-7	Courtesy of FORD MOTOR COMPANY	C4528-5
C4528-4	Courtesy of FORD MOTOR COMPANY	C4528-5

Are the resistances greater than 10, 000 ohms?

Yes

GO to B13

No	REPAIR the circuits in question.

B13 CHECK THE POWER LIFTGATE MOTOR SENSOR CIRCUITS FOR AN OPEN

Measure:

Left Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4527-4	Courtesy of FORD MOTOR COMPANY	C4174B-19
C4527-5	Courtesy of FORD MOTOR COMPANY	C4174B-20
C4527-6	Courtesy of FORD MOTOR COMPANY	C4174B-7
C4527-7	Courtesy of FORD MOTOR COMPANY	C4174B-8

Right Power Liftgate Motor

Positive Lead	Measurement / Action	Negative Lead
C4528-4	Courtesy of FORD MOTOR COMPANY	C4174B-19
C4528-5	Courtesy of FORD MOTOR COMPANY	C4174B-20
C4528-6	Courtesy of FORD MOTOR COMPANY	C4174B-4
C4528-7	Courtesy of FORD MOTOR COMPANY	C4174B-10

Are the resistances less than 3 ohms?

Yes	INSTALL a power liftgate motor in question. REFER to: Power Liftgate Motor . TEST the system for normal operation. If the concern is still present, GO to B20

No	REPAIR the circuit in question.

B14 CHECK FOR OTHER LIFTGATE LATCH DIAGNOSTIC TROUBLE CODES (DTCS)

View the results from the RGTM self-test.

Are any RGTM Diagnostic Trouble Codes (DTCs) present?

Yes	For DTC B145D:11, B145D:12 or B145D:13, GO to B16 For all other Diagnostic Trouble Codes (DTCs), REFER to RGTM DTC Chart .

GO to B15

B15 CHECK THE RGTM (REAR GATE TRUNK MODULE) LIFTGATE MOTOR SENSOR PID (PARAMETER IDENTIFICATION)

NOTE: If the liftgate motor sensor Parameter Identifications (PIDs) are not available or the liftgate latch does not release, proceed to the next step.
- Open the liftgate to the full open position.
- Ignition ON.
- Using a diagnostic scan tool, view the RGTM Parameter Identifications (PIDs).
- Using a diagnostic scan tool, view the RGTM liftgate motor sensor PID.
- From the full open position, slowly close the liftgate.
Does the PID change state when the liftgate starts moving?

Yes GO to B16

No GO to B10

B16 CHECK THE LIFTGATE LATCH MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect RGTM C4174A .

Disconnect Power Liftgate Latch C4339B .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4174A-2	Courtesy of FORD MOTOR COMPANY	Ground
C4174A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.

GO to B17

B17 CHECK THE LIFTGATE LATCH MOTOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4174A-2	Courtesy of FORD MOTOR COMPANY	Ground
C4174A-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to B18

No	REPAIR the circuit in question.

B18 CHECK THE LIFTGATE LATCH MOTOR CIRCUITS FOR A SHORT TOGETHER

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4174A-2	Courtesy of FORD MOTOR COMPANY	C4174A-3

Is the resistance greater than 10, 000 ohms?

Yes

GO to B19

No	REPAIR the circuits.

B19 CHECK THE LIFTGATE LATCH MOTOR CIRCUITS FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4174A-2	Courtesy of FORD MOTOR COMPANY	C4339B-1
C4174A-3	Courtesy of FORD MOTOR COMPANY	C4339B-2

Are the resistances less than 10, 000 ohms?

Yes	GO to Pinpoint Test K

No	REPAIR the circuit in question.

B20 CHECK FOR CORRECT RGTM (REAR GATE TRUNK MODULE) OPERATION

Disconnect and inspect all RGTM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect all the RGTM connectors and make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new RGTM. REFER to: Rear Gate Trunk Module (RGTM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.