Pinpoint Test A : All Windshield Wiper Modes Are Inoperative

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE WIPER RELAY

Disconnect: Wiper Relay.

Substitute a known good relay and recheck the windshield wiper motor operation.

Do the wipers operate?

Yes	REMOVE the known good relay. INSTALL a new wiper relay.
No	REMOVE the known good relay. GO to A2.

A2 CHECK THE BATTERY SUPPLIED VOLTAGE CIRCUIT TO THE WIPER RELAY FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Wiper relay, cavity 3	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to A3.
No	VERIFY the BJB fuse 50 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

A3 CHECK THE WIPER RELAY COIL VOLTAGE SUPPLY CIRCUIT

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Wiper relay, cavity 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to A5.
No	VERIFY the BCM fuse 10 (10A) is OK. If OK, GO to A4. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

A4 CHECK THE WIPER RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: BCM C2280F .

Measure:

Positive Lead	Measurement / Action	Negative Lead
Wiper relay, cavity 1	Courtesy of FORD MOTOR COMPANY	C2280F-11

Is the resistance less than 3 ohms?

Yes	GO to A11.
No	REPAIR the circuit.

A5 CHECK THE WIPER RELAY COIL GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
Wiper relay, cavity 1	Courtesy of FORD MOTOR COMPANY	Wiper relay, cavity 2

Is the voltage greater than 11 volts?

Yes	GO to A6.
No	REPAIR the circuit.

A6 CHECK THE WINDSHIELD WIPER MOTOR VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Connect: Wiper Relay.

Disconnect: Windshield Wiper Motor C1656 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1656-8	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to A7.
No	REPAIR the circuit.

A7 CHECK THE WINDSHIELD WIPER MOTOR GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1656-8	Courtesy of FORD MOTOR COMPANY	C1656-6

Is the voltage greater than 11 volts?

Yes	GO to A8.
No	REPAIR the circuit.

A8 CHECK THE FAIL-SAFE HIGH SPEED WIPER GROUND CIRCUIT CONTROL

NOTE: The following step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250- 300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

Ignition OFF.

Connect:

Lead 1	Measurement / Action	Lead 2
C1656-8	Courtesy of FORD MOTOR COMPANY	C1656-1

Place the wiper/washer switch to the high speed setting and then off.

Does the test lamp illuminate when the wiper/washer switch is set to the high speed setting?

Yes	INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield .
No	GO to A9.

A9 CHECK THE FAIL-SAFE HIGH SPEED WIPER GROUND CIRCUIT FOR AN OPEN

NOTE: If steps A1-A8 did not identify the cause of the concern, a double fault is present. After the fail-safe ground is diagnosed and repaired, it is necessary check all operation modes and diagnose any symptom still present.

Disconnect: SCCM C226A .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1656-1	Courtesy of FORD MOTOR COMPANY	C226A-12

Is the resistance less than 3 ohms?

Yes	INSTALL a new multifunction switch. REFER to Steering Column Switches . TEST the system for normal operation. If the concern is still present, GO to A10.
No	REPAIR the circuit.

A10 CHECK FOR CORRECT SCCM OPERATION

Disconnect and inspect all SCCM connectors.

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

Reconnect the SCCM connectors. 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 On-Line Automotive Service Information System (OASIS) for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new SCCM. REFER to Steering Column Switches .
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.

A11 CHECK FOR CORRECT BCM OPERATION

Disconnect and inspect all BCM connectors.

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

Reconnect the BCM connectors. 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 On-Line Automotive Service Information System (OASIS) for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TBS instructions. If no TSBs address this concern, BCM Hardware Testing .
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.