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Wiper Motor - Diagnosis and Testing

84chrysler10

Models


1984 Chrysler 5th Avenue, Plymouth Gran Fury & Dodge Diplomat


Subject


Wiper Motor Diagnosis & Testing Procedures


Index


ELECTRICAL

Date

September 10, 1984

No.


08-18-84

P-3767-C
Approximately April 15, 1984, a new worm drive windshield wiper motor, PN 4334104, went into production on subject model vehicles.

This one motor assembly is used for both standard two-speed wipe and delay systems.

This bulletin outlines the new diagnosis and testing procedures:

NOTE: IF A MALFUNCTION INVOLVES ONLY THE DELAY MODE, SWITCH OR WIRING, REFER TO THE ELECTRICAL SECTION OF THE SERVICE MANUAL.

Wiper motor and mounting bracket must be replaced as an assembly. PN 4334104 is a complete assembly.

FIGURE 1 - WIPER MOTOR TERMINAL COVER:




FIGURE 2 - WIPER MOTOR TERMINAL SUPPRESSOR:




WIPER MOTOR WIRING CONNECTOR

To gain access to the wiper motor wiring terminals, remove terminal cover (Figure 1) or the suppressor (Figure 2) as required.

In the event that the wiper motor assembly is replaced, the terminal cover or suppressor must be reinstalled on the new unit.
Condition

Motor will not run in any switch position.

Procedure

1. Check for a blown fuse in the fuse block.

a. If fuse is good proceed to Step 2.

b. If fuse is defective replace and check motor operation in all switch positions.

c. If motor is still inoperative and the fuse does not blow proceed to Step 2.
d. If replacement fuse blows proceed to Step 5.

2. Place switch in low speed position.

3. Listen to motor. If you cannot hear it running, proceed to Step 4. If you can hear it running, check motor output shaft. If output shaft is not turning, replace motor assembly. If it is turning, drive link to output shaft or linkage is not properly connected. Replace worn parts and/or properly connect drive link to the motor output shaft.

FIGURE 3 - VOLTMETER BETWEEN TERMINAL "L" & GROUND:




FIGURE 4 - TEST LAMP BETWEEN TERMINAL "L" & GROUND:




4. Connect a voltmeter or a test lamp between motor terminal "L" and ground strap (Figures 3 and 4). If there is no voltage, check wiring and switch. If there is approximately 12 volts at terminal "L" or test lamp lights, problem is:

a. An open ground circuit. Make sure the motor mounting is free of paint and nuts are tight.

b. A faulty motor assembly.

5. Disconnect motor wiring connector and replace fuse.

a. If fuse does not blow, motor is defective.

b. If fuse blows, switch or wiring is at fault.
Condition

Motor runs slowly at all speeds.

FIGURE 5 - AMMETER BETWEEN TERMINAL "L" & BATTERY:




Procedure

1. Disconnect wiring harness connector at motor. Remove wiper arms and blades. Connect an ammeter between, battery and terminal "L" on motor (Figure 5).
2. If motor runs and average ammeter reading is more than 6 amps, check to see if wiper linkage or pivots are binding or caught. Disconnect drive link from motor. If motor now runs and draws less than 3 amps, repair linkage system.

3. If motor continues to draw more than 3 amps, replace motor assembly.

Condition

Motor will run at high speed, but not a low speed. Motor will run at low speed, but not at high speed.

FIGURE 6 - TEST LAMP BETWEEN TERMINAL "H" & GROUND:




Procedure

1. If motor will not run on High speed, put switch in High position and connect a test lamp between motor terminal "H" and ground (Figure 6).

FIGURE 4 - TEST LAMP BETWEEN TERMINAL "L" & GROUND:




If motor will not run on Low speed, put switch in Low position and connect a test lamp between motor terminal "L" and ground (Figure 4).
2. If test lamp does not light at motor terminal, there is an open in wiring or switch. If test lamp lights at motor terminal, replace motor assembly.
Condition

Motor will keep running with switch in off position.

FIGURE 7:




Procedure

1. Remove wiring harness. Connect jumper from terminal "P(2)" to terminal "L" (Figure 7).

2. Connect second jumper from terminal "P(1)" to battery. If motor runs to park position and stops, switch is faulty. If motor keeps running and does not park, replace motor assembly.
Condition

Motor will stop wherever it is when column switch is put in off position. (Wipers do not continue running to park position.)

Procedure

1. Remove motor wiring connector and clean terminals. Reconnect connector and test motor. If problem persists, proceed to Step 2.

2. Put column switch in Off position.

FIGURE 8:




3. Connect a voltmeter or test lamp between terminal "P(1)" and "L" (Figure 8).

FIGURE 9:




If there are 12 volts or test lamp lights at terminal "P(1)", check the voltage at terminal "P(2)". If voltage at terminal "P(2)" is 0 or test lamp (Figure 9) does not light, motor park switch is faulty and motor assembly must be replaced. If there are 12 volts at terminal "P(2)" or test lamp comes on, there is an open in the column switch or the wiring.
All replaced assemblies are to be returned so that proper evaluation can be made.

POLICY: Reimbursable within the provisions of the warranty

TIME ALLOWANCE:
Labor Operation No. Refer to Labor Operation Time Schedule
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