Pinpoint Test N : The Heated Wiper Park Feature Is Inoperative

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

N1 CHECK THE REAR WINDOW DEFROST OPERATION
- Start the vehicle.
- Activate the rear window defrost feature.
Does the rear window defrost operate?

Yes GO to N2

No REFER to: Glass, Frames and Mechanisms .

N2 CHECK THE HEATED WIPER PARK RELAY
- Ignition OFF.
- Disconnect Heated Wiper Park Relay.
- Carry out the component test on the heated wiper park relay. Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for schematic and connector information.
Did the heated wiper park relay pass the component test?

Yes GO to N3

No INSTALL a new heated wiper park relay.

N3 CHECK FOR VOLTAGE TO THE HEATED WINDSHIELD

Ignition OFF.

Install the heated wiper park relay.

Disconnect Heated Windshield Element C1531.

Connect:

Lead 1	Measurement / Action	Lead 2
C1531-1	Courtesy of FORD MOTOR COMPANY	Ground

Start the vehicle.

Activate the rear window defrost feature.

Does the test lamp illuminate when the rear window defrost feature is activated?

Yes

GO to N7

GO to N4

N4 CHECK THE HEATED WIPER PARK RELAY OUTPUT CIRCUIT FOR AN OPEN

Ignition OFF.

Remove the heated wiper park relay

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1532-1	Courtesy of FORD MOTOR COMPANY	Heated wiper park relay, cavity 5

Is the resistance less than 3 ohms?

Yes

GO to N5

No	VERIFY BJB Fuse 74 (10A) is OK. If OK, REPAIR the open circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.

N5 CHECK THE HEATED WIPER PARK RELAY VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Start the vehicle.

Activate the rear window defrost feature.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Heated wiper park relay, cavity 3	Courtesy of FORD MOTOR COMPANY	Ground
Heated wiper park relay, cavity 1	Courtesy of FORD MOTOR COMPANY	Ground

Are both voltages greater than 11 volts?

Yes

GO to N6

No	REPAIR the circuit in question.

N6 CHECK THE HEATED WIPER PARK RELAY COIL CONTROL CIRCUIT FOR AN OPEN

Connect:

Lead 1	Measurement / Action	Lead 2
Courtesy of FORD MOTOR COMPANY Heated wiper park relay, cavity 2	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY Battery Positive

Start the vehicle.

Activate the rear window defrost feature.

Does the test lamp illuminate when the rear window defrost is activated?

Yes	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

No	REPAIR the circuit.

N7 CHECK THE WINDSHIELD HEATED WIPER PARK GROUND CIRCUIT FOR AN OPEN

Connect:

Lead 1	Measurement / Action	Lead 2
C1531-1	Courtesy of FORD MOTOR COMPANY	C1531-2

Start the vehicle.

Activate the rear window defrost feature.

Does the test lamp illuminate when the rear window defrost feature is activated?

Yes	INSTALL a new windshield. REFER to: Fixed Glass .

No	REPAIR the circuit.