WINDSHIELD WIPER/WASHER DIAGNOSIS PROCEDURE

MODELS AFFECTED: 1985 ELECTRA AND PARK AVENUE

This bulletin contains diagnostic procedures and trouble trees which supplement the Chassis Service Manual. Refer to the chart listed below for the appropriate procedure.

Washer Pump Inoperative Procedure 1 Washer Pumps Continuously Procedure 2 Wiper Motor Inoperative Procedure 3 Intermittent Wiper Operation Procedure 4 Wiper Will Not Park Procedure 5 No Delay, Wipers Operate In "Low" And "High" Modes Procedure 6 Wiper Stays In Delay Mode During Wash Cycle When Procedure 7 Started In Delay Mode No Low Mode Procedure 8 No High Mode Procedure 9 Blades Cycle In And Out Of Park Position When Procedure 10 Wiper Is Shut Off Motor End Cover Replacement Procedure 11

Before performing any diagnosis of the system to determine the cause of these conditons, the following two items should be checked: A) Wiper fuse is not blown; and, B) That the wiper motor groun strap is secure and that the ground strap has continuity to the body ground.

NOTICE: When the diagnosis procedure requires wiper motor operation, the windshield and wiper blades must be cleaned to avoid damaging glass.

PROCEDURE 11 - MOTOR END COVER REPLACEMENT

1. Check motor grounds. If ground is poor, install ground clip (P/N 22048623).

2. Check armature for open circuit.

3. Check circuit breaker for intermittent open.

4. Check brush plate assembly for restricted brush to commutator contact.

5. Replace motor end cap, P/N 22038791.

To replace motor end cap:

a. Disassemble end cap by bending fasten tabs outward and remove end cap from armature shaft (see Figure 1). Do not remove armature.

b. Spray "spray on" 2002 T.F. electrical contact and tape head cleaner or equivalent on clean cloth and wipe commutator clean.

c. Install new end cap and bend fasten tabs back to original position.

d. Install ground clip, P/N 22048623.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.