Wiper/washer System Ford Tempo I

STANDARD WIPERS

Wipers are actuated by 2-speed permanent magnet motor. Wiper arms and blades are mounted on pivot shafts and connected to motor by linkage arms and retaining clips. Wiper system power is supplied by a 12-volt, 6-amp circuit, with fuse panel-mounted breaker.

PARK OPERATION

With wiper switch off, wipers will complete one cycle. When park switch is in "RUN" position, current flows from the ignition switch through the wiper switch to the wiper motor. The low speed "RUN" circuit is from the wiper motor park switch through the wiper switch, to the motor low speed brush, across the armature and out a common brush to ground. At the last 1/10 portion of the cycle, the oscillating park switch moves from the "RUN" position to the "PARK" (ground) position, stopping the motor in the "PARK" position.

Scheme 1

1. With the wiper switch in "HIGH" position, current flows from the ignition switch through the wiper switch to the wiper motor high terminal. To check high speed operation, turn ignition switch on and place wiper switch in "HIGH" position. (Scheme 1) (Scheme 1): Motor Park Test Connections
2. Check for voltage at the circuit No. 56 terminal at 3-way motor connector. If no voltage is present, check voltage at circuit No. 63 at the wiper switch. If voltage is present at circuit No. 63 but not present at circuit No. 56, replace the wiper switch.
3. If voltage is not present at circuit No. 63, trace circuit back to source to determine problem. If voltage is present at circuit No. 56 and motor does not run, ground the motor ground terminal to the body. If motor runs, service ground wiring. If motor does not run, replace motor.

LOW SPEED

1. With wiper switch in "LOW" position, current flows from the ignition switch through wiper switch to wiper motor low terminal. To check low speed operation, turn ignition switch on and place switch in "LOW" position.
2. Check for voltage at circuit No. 58 terminal (3-way motor connector). If no voltage is present, check voltage at circuit No. 63. If voltage is present at circuit No. 63 but not present at circuit No. 58, replace wiper switch. If voltage is not present at circuit No. 63, trace circuit back to source to determine problem. If voltage is present at circuit No. 58 and motor does not run, ground motor ground terminal to body. If motor runs, service ground wiring. If motor does not run, replace motor.

PARK

1. To check the park operation, turn ignition switch to "RUN" position. Place wiper switch in "OFF" position. Check for voltage at circuits No. 58, 28 and 63 at 4-pin connector. If voltage is present on all 3 circuits and wiper blades are not in "PARK" position, ground motor case to body. If motor does not move to "PARK" position, replace motor.
2. If voltage check shows only voltage at circuit No. 63, replace wiper motor. If voltage check shows voltage at circuits No. 63 and 28 wire only, replace wiper switch. If voltage is still not present at circuit No. 58, trace circuits No. 28 wire and 58 back to wiper switch to determine source of problem.

WIPER MOTOR CURRENT DRAW

Note. Electric wiper motors contain permanent magnets made of ceramic. This is a hard glass-like material that can shatter or crack if the motor receives a severe physical shock.

Disconnect negative battery cable. Disconnect motor linkage and electrical connector. Connect ammeter. (Scheme 2) Current draw in both low and high should not exceed 3 amps.

WIPER MOTOR PARK TEST

Stop wiper system with key when blades are in "UP" position. Connect jumper wires. (Scheme 3) The wipers should run for up to one cycle, then park. If motor will not park or run to park, replace motor. If motor stops, check wiring and switch.

Scheme 2

Scheme 3

1. Remove circuit breaker from fuse panel. Connect tester to circuit breaker. Adjust tester to 6 amps and leave on for 10 minutes. Replace circuit breaker if it opens. (Scheme 2): Motor Current Draw Test (Scheme 3): Motor Park Test
2. Adjust tester so current flow is 12 amps. Breaker should open within 30 seconds. If breaker does not open, replace breaker.

WIPER SWITCH CONTINUITY TEST

Test switch continuity with an ohmmeter connected between switch terminals. (Scheme 4) To detect marginal operation of switch, move switch lever as each reading is being taken. If switch does not show continuity or if poor continuity exists, replace switch.

Wiper Switch Continuity Test Terminal Locations. Scheme 4

WIPER SWITCH CONTINUITY TEST

Removal

Disconnect battery cable. Lift water shield cover from cowl on passenger side. Disconnect power lead from wiper motor. Remove linkage retaining clip from wiper arm. Remove 3 attaching screws from motor and bracket assembly. Remove operating arm from motor. Remove 3 bolts and separate motor from mounting bracket.

Installation

To install, reverse removal procedure and check for proper motor operation.

Disconnect negative battery cable. Remove upper and lower steering column shrouds. Disconnect electrical connector to switch. Peel back foam sight shield. Remove 2 hex head screws holding switch. Remove switch.

To install, reverse removal procedure. Check steering column operation.