1996 Bronco/F-Series

Section 01-16: Wiper and Washer Systems

1996 F-150, F-250, F-350, F-Super Duty and Bronco Workshop Manual

DIAGNOSIS AND TESTING

Pinpoint Tests

PINPOINT TEST A: WINDSHIELD WASHER SYSTEM INOPERATIVE

A1 WINDSHIELD WASHERS INOPERATIVE

Check fluid level of windshield washer reservoir.

Is windshield washer reservoir empty?

Yes	No
FILL windshield washer reservoir. RESTORE vehicle. RETEST system.	GO to A2.

A2 TURN ON WASHER SWITCH

Key to RUN, check operation ofwindshield washer pump.

Does windshield washer pump run?

Yes	No
GO to A3.	GO to A6.

A3 INSPECT WINDSHIELD WASHER NOZZLE JET FOR BLOCKAGE

Inspect windshield washer nozzle jet for blockage.

Is windshield washer nozzle jet blocked?

Yes	No
CLEAN or REPLACE windshield washer nozzle jet. RESTORE vehicle. RETEST system.	GO to A4.

A4 INSPECT HOSE, FILTER, CHECK VALVE FOR BLOCKAGE OR KINKS

Inspect hose for blockage or kinks.

Are any blockages or kinks present?

Yes	No
CLEAN, SERVICE or REPLACE as necessary. RESTORE vehicle. RETEST system.	GO to A5.

A5 INSPECT WINDSHIELD WASHER PUMP INLET/OUTLET FOR BLOCKAGE

Inspect windshield washer pump inlet/outlet for blockage.

Is windshield washer pump inlet/outlet blocked or obstructed?

Yes	No
REMOVE windshield washer pump from windshield washer reservoir and CLEAN. RESTORE vehicle. RETEST system.	REPLACE windshield washer pump. RESTORE vehicle. RETEST system.

A6 CHECK FOR VOLTAGE AT WINDSHIELD WASHER PUMP

Using a voltmeter, actuate the washer switch and check for voltage at windshield washer pump.

Is battery voltage present?

Yes	No
GO to A7.	GO to A8.

A7 CHECK WINDSHIELD WASHER PUMP GROUND

Using an ohmmeter connected to a known good ground, check ground at windshield washer pump connector with the other test lead.

Is connector properly grounded with resistance of 5 ohms or less?

Yes	No
REPLACE windshield washer pump. RESTORE vehicle. RETEST system.	SERVICE Circuit 57 (BK) for open circuit. RESTORE vehicle. RETEST system.

A8 TURN ON WINDSHIELD WIPERS

Check operation of windshield wipers.

Do wipers operate?

Yes	No
GO to A9.	GO to Pinpoint Test B.

A9 CHECK MULTI-FUNCTION SWITCH RESISTANCE AT WIPER CONTROL MODULE

Unplug connector from wiper control module.
Depress windshield washer switch on end of the multi-function switch.
Using an ohmmeter, check continuity between Circuits 993 (BR/W) and 590 (DB/W).

Is there continuity?

Yes	No
GO to A11.	GO to A10.

A10 CHECK MULTI-FUNCTION SWITCH

Unplug multi-function switch connector.
Depress multi-function switch.
Check for continuity between terminals 4 and 6.

Is there continuity?

Yes	No
SERVICE open circuit between multi-function switch and wiper control module. RESTORE vehicle. RETEST system.	REPLACE multi-function switch. RESTORE vehicle. RETEST system.

A11 CHECK WASHER PUMP CIRCUIT

Check continuity of Circuit 941 (BK/W) from wiper control module to windshield washer pump.

Is there continuity?

Yes	No
REPLACE wiper control module. RESTORE vehicle. RETEST system.	SERVICE Circuit 941 (BK/W) for open circuit. RESTORE vehicle. RETEST system.

PINPOINT TEST B: WINDSHIELD WIPERS INOPERATIVE— ALL SWITCH POSITIONS

B1 CHECK FOR SUPPLY VOLTAGE AT MOTOR

Key to RUN.
Turn multi-function switch to HI.
Unplug windshield wiper motor.
Check for battery voltage at Circuit 65 (DG).

Is battery voltage present?

Yes	No
GO to B2.	CHECK for open fuse. REPLACE fuse. If fuse fails again, SERVICE B+ short to ground in Circuit 65 (DG). RETEST system.

B2 CHECK FOR BATTERY VOLTAGE AT THE WINDSHIELD WIPER CONTROL MODULE

Check for battery voltage at Circuit 65 (DG) Pins 2 and 11 of connector.

Is battery voltage present?

Yes	No
GO to B3.	SERVICE open in power feed to windshield wiper control module.

B3 CHECK FOR BATTERY VOLTAGE TO MOTOR WINDINGS

Key to RUN.
Turn multi-function switch to HI.
Disconnect connector from windshield wiper motor.
Check for battery voltage between Circuits 61 (Y/R) and 58 (W).

Is battery voltage present?

Yes	No
REPLACE wiper motor.	GO to B4.

B4 CHECK FOR BATTERY VOLTAGE AT WINDSHIELD WIPER CONTROL MODULE CONNECTOR

Check for battery voltage between Pin 10 Circuit 61 (Y/R) and Pin 14 Circuit 58 (W) of windshield wiper control module connector.

Is battery voltage present?

Yes	No
CHECK for: Open wire Circuits 58 (W) or 61 (Y/R). Unseated terminals.	GO to B5.

B5 CHECK WIRING BETWEEN WINDSHIELD WIPER CONTROL MODULE AND MULTI-FUNCTION SWITCH

Disconnect connector from windshield wiper control module and column connector to switch.
Measure resistance between Circuits 993 (BR/W) and 589 (O) with multi-function switch at HI.

Is resistance less than 5 ohm?

Yes	No
REPLACE wiper control module.	GO to B6.

B6 CHECK WIPER SWITCH CONTINUITY

Disconnect multi-function switch harness at steering column.
Check continuity between terminals 1 and 4 with switch at HI in on position.

Is resistance less than 1 ohm?

Yes	No
CHECK for open wire between multi-function switch and wiper control module. SERVICE as required.	REPLACE multi-function switch.

PINPOINT TEST C: WINDSHIELD WIPERS INOPERATIVE AT HIGH SPEED

C1 CHECK FOR BATTERY VOLTAGE TO MOTOR WINDINGS

Key to RUN.
Turn multi-function switch to HI.
Disconnect connector from windshield wiper motor.
Check for battery voltage between Circuits 61 (Y/R) and 58 (W).

Is voltage present?

Yes	No
REPLACE wiper motor.	GO to C2.

C2 CHECK FOR BATTERY VOLTAGE AT WIPER CONTROL MODULE CONNECTOR

Check for battery voltage between Pins 10 and 14 (Circuits 61 [Y/R] and 58 [W]) of windshield wiper control module connector.

Is voltage present with multi-function switch at HI?

Yes	No
CHECK for: Open in Circuits 58 (W)or 61 (Y/R). Open connector. GO to B3.	GO to C3.

C3 CHECK WIRING BETWEEN WIPER CONTROL MODULE AND WIPER SWITCH

Disconnect connector from windshield wiper control module.
Measure resistance between Circuits 993 (BR/W) and 589 (O) with multi-function switch at HI.

Is resistance less than 1.0 ohm?

Yes	No
REPLACE windshield wiper control module.	GO to C4.

C4 CHECK CONTROL LINE SIGNAL AT WIPER SWITCH

Disconnect harness from the multi-function switch.
Check continuity between terminals 4 and 1.

Is resistance less than 1.0 ohm?

Yes	No
SERVICE open wire between multi-function switch and windshield wiper control module.	REPLACE multi-function switch.

PINPOINT TEST D: WINDSHIELD WIPERS INOPERATIVE AT LOW SPEED

D1 CHECK FOR BATTERY VOLTAGE TO MOTOR WINDINGS

Key to RUN.
Turn multi-function switch to LO.
Disconnect connector from windshield wiper motor.
Check for battery voltage between Circuits 61 (Y/R) and 56 (DB/O).

Is voltage present?

Yes	No
REPLACE wiper motor.	GO to D2.

D2 CHECK FOR BATTERY VOLTAGE AT WIPER CONTROL MODULE CONNECTOR

Check for battery voltage between Pins 10 and 8 (Circuits 61 [Y/R] and 56 [DB/O]) of windshield wiper control module connector.

Is voltage present with multi-function switch at LO?

Yes	No
CHECK for: Open in Circuits 56 (DB/O) or 61 (Y/R). Open connector.	GO to D3.

D3 CHECK WIRING BETWEEN WIPER CONTROL MODULE AND WIPER SWITCH

Disconnect connector from windshield wiper control module.
Measure resistance between Circuits 993 (BR/W) and 589 (O) with multi-function switch at LO.

Is resistance between 3.5 and 4.5 ohms?

Yes	No
REPLACE windshield wiper control module.	GO to D4.

D4 CHECK CONTROL LINE SIGNAL AT WIPER SWITCH

Disconnect harness from the multi-function switch.
Check continuity between terminals 4 and 1.

Is resistance between 3.5 and 4.5 ohms?

Yes	No
SERVICE open wire between multi-function switch and windshield wiper control module.	REPLACE multi-function switch.

PINPOINT TEST E: WINDSHIELD WIPERS INOPERATIVE AT INTERVAL SETTING

E1 CHECK OPERATION

Check operation of wipers in low speed setting.

Does low speed work?

Yes	No
GO to E2.	GO to D1.

E2 CHECK MODE SELECT INPUT SIGNAL

Disconnect connector from windshield wiper control module.
Measure resistance between Circuits 993 (BR/W) and 589 (O) with multi-function switch at interval.

Is resistance between 10.5k ohms and 12.0k ohms?

Yes	No
GO to E4.	GO to E3.

E3 CHECK MODE SELECT SIGNAL AT WIPER SWITCH

Disconnect harness from the multi-function switch.
Measure between terminals 4 and 1 with multi-function switch at interval.

Is resistance between 10.5k ohms and 12.0k ohms?

Yes	No
CHECK for open wire between multi-function switch and windshield wiper control module. SERVICE as required.	REPLACE multi-function switch. SERVICE as required.

E4 CHECK INTERVAL SELECT INPUT SIGNAL

Measure resistance between Circuits 590 (DB/W) and 993 (BR/W) at the wiper control module connector while rotating the interval select on the multi-function switch from S to F.

Is resistance 3.3k-103.3k ohms?

Yes	No
REPLACE windshield wiper control module.	GO to E5.

E5 CHECK INTERVAL SELECT INPUT SIGNAL AT WIPER SWITCH

Measure resistance between terminals 4 and 1, while rotating the interval select on the multi-function switch from S to F.

Is resistance 3.3k-103.3k ohms?

Yes	No
CHECK for open wires between the multi-function switch and the windshield wiper control module. SERVICE as required.	REPLACE multi-function switch. SERVICE as required.

PINPOINT TEST F: WINDSHIELD WIPERS WILL NOT PARK AT PROPER POSITION

F1 CHECK WIPER MOTOR GROUND

Unplug wiper motor connector. Check for ground at Circuit 57 (BK).

Is ground OK?

Yes	No
GO to F2.	SERVICE Circuit 57 (BK) for open circuit. RESTORE vehicle. RETEST system.

F2 CHECK FOR POWER AT WIPER MOTOR

Key to RUN and multi-function switch OFF.
Check for battery voltage between Circuit 65 (DG) and Circuit 57 (BK) at the motor connector.

Is battery voltage present?

Yes	No
GO to F3.	SERVICE open circuits. RESTORE vehicle. RETEST system.

F3 CHECK MOTOR CIRCUIT CONTINUITY THROUGH WIPER CONTROL MODULE

With wiper switch at OFF, check continuity of Circuit 28 (BK/PK) to 56 (DB/O) and Circuit 61 (Y/R) to 57 (BK).

Is continuity OK?

Yes	No
GO to F5.	GO to F4.

F4 CHECK CIRCUITS TO WIPER CONTROL MODULE

Unplug wiper control module connector.
Check continuity of Circuits 28 (BK/PK), 56 (DB/O), 61 (Y/R), and 57 (BK) from wiper motor to wiper control module.

Is continuity OK?

Yes	No
REPLACE wiper control module. RESTORE vehicle. RETEST system.	SERVICE open circuits. RESTORE vehicle. RETEST system.

F5 CHECK WIPER LINKAGE

Check that wiper linkage is not bent, cracked or mispositioned from motor shaft.

Is linkage OK?

Yes	No
REPLACE windshield wiper motor. RESTORE vehicle. RETEST system.	SERVICE linkage. RESTORE vehicle. RETEST system.

PINPOINT TEST G: WINDSHIELD WIPERS CONTINUE TO RUN WHEN SWITCH IS TURNED OFF

G1 CHECK CONNECTIONS

Check that windshield wiper motor and wiper control module connectors are fully seated.

Are connections OK?

Yes	No
GO to G2.	SERVICE as required. RECHECK system.

G2 CHECK CIRCUIT CONTINUITY THROUGH WIPER CONTROL MODULE

Disconnect windshield wiper motor.
With wiper switch at OFF, check continuity of Circuit 28 (BK/PK) to 56 (DB/O) and Circuit 61 (Y/R) to 57 (BK) at motor connector.

Is there continuity?

Yes	No
REPLACE windshield wiper motor. RESTORE vehicle. RETEST system.	GO to G3.

G3 CHECK CIRCUITS TO WIPER CONTROL MODULE

Check continuity of Circuits 28 (BK/PK), 56 (DB/O), 61 (Y/R) and 57 (BK) from windshield wiper motor to wiper control module.

Is continuity OK?

Yes	No
GO to G4.	SERVICE circuits as required. RESTORE vehicle. RETEST system.

G4 CHECK CIRCUITS TO WINDSHIELD WIPER SWITCH

With wiper switch at OFF, measure resistance between Circuits 589 (O) and 933 (BR/W) at wiper module.

Is resistance 45k ohms to 50k ohms?

Yes	No
REPLACE wiper control module. RESTORE vehicle. RETEST system.	GO to G5.

G5 CHECK CIRCUIT CONTINUITY

Check continuity of Circuits 589 (O) and 993 (BR/W) between wiper switch and wiper control module.

Is continuity OK?

Yes	No
REPLACE multi-function switch. RESTORE vehicle. RETEST system.	SERVICE open circuits. RESTORE vehicle. RETEST system.