Wiper/Washer: Pulse. How The Circuit Works. Component Location Index. G Right front of engine compartment

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Joseph Harrell
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1 Component Location Index Dash Fuse Box Behind left kick panel Washer Motor Behind right side of front bumper, in washer fluid reservoir Winter Position Switch Mounted on trim panel, below steering column Wiper Control Unit Mounted on trim panel, below steering column Wiper Motor Right rear corner of engine compartment C3G9(5-WHT) Right rear corner of engine compartment C31G(3-WHT) Right rear corner of engine compartment C402 (22-GRN) Behind right side of dash C419(24-GRN) Under left side of dash, near kick panel C425(8-GRN) Behind left side of dash, on dash junction box C445(18-YEL) Behind left kick panel, on dash fuse box C795(8-WHT) Behind left side of dash, on wiper control unit C796(6-WHT) Behind left side of dash, on wiper control unit G Right front of engine compartment G Right front of engine compartment G Behind right center of dash G23 Right rear of engine compartment, on wiper motor housing How The Circuit Works System Description The various wiper functions are selected by the combination switch which includes the wiper switch, washer switch, mist switch and intermittent delay time controller. The wiper control unit determines the parking position and the delay time interval. Battery voltage is applied to the wiper motor when the ignition switch is in RUN or START. The wiper motor has two brushes for low and high speed operation. When the wiper switch is in the LO or HI positions, one of the two brushes is connected to G12 through the wiper switch. When the wiper switch is turned off, the low speed brushes are grounded through the mist switch, wiper switch and wiper control unit (BLU wire). The wiper motor continues to run until the automatic stop slip ring reaches the position shown in the schematic, which occurs at the parking position. Battery voltage is applied to the wiper control unit through the BLU/WHT wire. This signals the wiper control unit to remove ground from the wiper motor and stop the wiper in the park position. In the intermittent mode, ground is applied by the wiper control unit through the same BLU/WHT wire. The wipers run until the automatic stop slip ring makes one rotation. One rotation of the automatic stop slip ring coincides with one complete sweep of the wiper blades. The pause interval between sweeps is generated by circuits in the wiper control unit. The length of the interval can be varied by the intermittent delay time controller. When the mist switch is operated, the high speed brush of the wiper motor is grounded and voltage is sent to the wiper control unit to initiate mist operation. After the mist switch is released, the wipers continue to complete one full sweep of the wiper blades at low speed and then go to park position. When the winter position switch is activated, the wiper arms rise to the winter position as soon as the ignition switch is turned to RUN or START. By allowing the wiper arms to be parked higher up on the glass, snow or ice on the car can be cleared by the driver before the wipers are operated.

2 When the winter position switch is returned to the ON position, the wiper arms make one sweep and then retract to the normal park position as soon as the ignition switch is turned to RUN or START. The windshield washer is controlled directly by the washer switch. Whenever the washer switch is operated, a voltage is sent to the wiper control unit to start the wipers if they are not already running. After the washer switch is released, the wipers continue to operate for about 3 seconds and then park, unless the wiper switch is on. System Operation Table Begin the system operation with the ignition switch in RUN and the winter position switch in the ON (summer) position. Action Operate washer switch for one or two seconds. Turn wiper switch to INT. Normal Operation Washer sprays the windshield as long as washer switch is held on. Wipers begin operating as soon as the washer switch is operated. Wipers continue to run for about 3 seconds after the washer switch is released, then return to park. Wipers make one complete stroke then pause before making the next stroke. The pause interval may be varied from 2 to 10 seconds by adjusting the delay time control ring on the wiper switch. Action Activate the winter position switch using the tip of the ignition key. Turn wiper switch to LO, Turn wiper switch to OFF. Set winter position switch to ON (summer). Turn wiper switch to HI. Turn wiper switch to OFF. Operate mist switch. Normal Operation Wipers rise to winter park position and remain there. Wipers run continuously at low speed. Wipers park at elevated (winter) park position. Wipers make one sweep and then park at normal (depressed) position. Wipers run continuously at fast speed. Wipers return to park position. Wipers make one complete stroke and then return to the park position. Turn wiper switch to OFF. Wipers return to park position.

3 Quick Checks Troubleshooting 1. Check fuse 6 by operating the sunroof (optional). 2. Check ground G12 by operating the cigarette lighter (optional). 3. If washer does not operate, check that (critical): the washer reservoir is filled, hoses are not pinched or kinked, hoses are correctly attached, nozzles are not clogged. Symptom Wipers do not operate in any position. Wipers do not operate in high or low speed. Wipers do not operate in intermittent mode. Wipers do not operate in mist mode. Blades do not return to park position when wiper switch is turned off. Blades do not return to normal (recessed) position when winter position switch is ON. Little or no washer fluid is pumped. Troubletree A B C D E F G

4 Troubletree A Wipers do not operate in any position. Troubletree B Wipers do not operate in high or low speed. Disconnect C309 from the wiper (Continued on same page) Turn the ignition switch to RUN, GRN/BLK wire terminal of C309 and ground. Inspect fuse 6. GRN/BLK (+) and BLU/RED (-) wire terminals of C309. Turn the wiper switch to LO. Is fuse OK? Check the GRN/BLK wire for an Replace the fuse. Inspect BLU/RED wire to combination switch for an Is BLU/RED wire OK? Inspect BLK wire from combination switch to G12 for an Connect battery positive to the GRN/BLK wire terminal with fused jumper, and battery negative to the BLU/RED wire terminal of C309. If BLK wire Is OK replace combination switch. Does motor RUN smoothly at low speed? Replace wiper GRN/BLK ( + ) and BLU/GRN (-) wire terminals of C309. (Continued on page 91-6)

5 Troubleshooting (cont'd) (continued from page 91-5) Turn wiper switch to HI. Does the test tight go on? Inspect BLU/GRN wire to combination switch for an Is BLU/GRN wire OK? Inspect BLK wire is OK replace combination switch to G12 for an Connect battery positive to the GRN/BLK wire terminal with a fused jumper, and battery negative to the BLU/GRN wire terminal of C309. If BLK wire is OK replace combination switch. Does motor run smoothly at high speed? Check linkage. Reconnec t C309 to wipe r moto r and chec k operation. Is linkag e OK? Repair linkage. Replace wiper

6 Troubletree C Wiper s do not operat e in Intermittent mode. Disconnect C795 and C796 from the wiper control unit. Rotate delay control on combination switch to maximum delay position. Measure resistance between the GRN/YEL and GRN/WHT wire terminals of C795. Is resistance between 27,000 and 36,000 ohms? Rotate delay control slowly to minimum delay position while measuring resistance. Does resistance change to LESS THAN 100 ohms smoothly as control Is turned? Turn the wiper switch OFF, Turn the Ignition switch to RUN. BLU/YEL wire terminal of C795 and ground. Inspect BLU/YEL wire for an Turn the wiper switch to INT. Is BLU/YEL wire OK? (Continued on page 91-8)

7 Troubleshooting (cont'd) (Continued from page 91-7) YEL/RED wire terminal of C796 and ground. Inspect YEL/RED wire for an BLU wire terminal of C796 and ground, with the wiper motor in PARK, and the wiper switch in OFF or INT. Inspect BLU wire for an open, Turn the ignition switch OFF. Is BLU wire OK? Turn wiper switch to INT. Measure the resistance between the YEL/GRN and BLU/WHT wire terminals of C796. Is resistance less than 0.5 ohms? Replace wiper control unit.

8 Troubletree D Wipers do not operat e In mist mode. Disconnect C795 and C796 from the wiper control unit. Turn the ignition switch to RUN. GRN wire terminal of C795 and ground. Press the mist switch. Inspect GRN wire for an Disconnect C309 from the wiper Is GRN wire OK? Connect a self-powered test light between the BLU/GRN wire terminal of C309 and ground. Press the mist switch. Inspect BLU/GRN wire for an Replace wiper control unit. Is BLU/GRN wire OK?

9 Troubleshooting (cont'd) Troubletree E Blades do not return to park position when wiper switch is turned off. With the winter position switch OFF, turn the wiper switch to LO and operate the ignition switch between OFF and RUN until blades are in winter park position. Turn the Ignition OFF. Disconnect C309 from the wiper Measure the resistance between the GRN/BLK and BLU/WHT wire terminals of C309. Is resistance less than 0.5 ohms? Replace wiper Reconnect C309 to the wiper Operate ignition switch between OFF and RUN until blades are in or nearly in extended position. Turn the Ignition OFF. Disconnect C309 from the wiper Measure the resistance between the GRN/BLK and BLU/WHT wire terminals of C309. (Continued on page 91-11)

10 (Continued from page 91-10) is resistance Infinite (open circuit)? Measure the resistance between the BLU/WHT wire terminal of C309 and ground. Is resistance less than 0.5 ohms? Repair open In BLK wire to G10. Reconnect C309 to the wiper Disconnect C795 and C796 from the wiper control unit. Turn the wiper switch off. Turn the ignition switch to RUN. GRN/BLK wire terminal of C796 and ground. Inspect GRN/BLK wire for an BLU wire terminal of C796 and ground. Is GRN/BLK wire OK? Disconnect C425 from the combination switch. Repair GRN/BLK wire. GRN/BLK wire terminal of C425 and ground. Repair open in GRN/BLK wire to fuse 6. (Continued on page 91-12)

11 Troubleshooting (cont'd) (Continued from page 91-11) Inspect BLU wire for an Connect a self-powered test lamp between the BLU/WHT wire terminal of C796 and ground. Is BLU wire OK? Inspect BLU/WHT wire for an Is BLU/WHT wire OK? Connect a self-powered test light between the YEL/GRN wire terminal C795 and ground. Disconnect C425 from the combination switch. Connect a self-powered test lamp between the BLU/WHT wire terminal of C796 and ground. Repair open in BLU/WHT wire to wiper Inspect YEL/GRN wire for an Replace wiper control unit. Is YEL/GRN wire OK?

12 Troubletree F Blades do not return to normal (recessed) position when winter position switch is ON. With the winter position switch In winter (exposed) position, turn the wiper switch to LO and operate the ignition switch between OFF and RUN until blades are at, or near the extended position. Turn the Ignition switch OFF. Disconnect C310 from the wiper Connect a sett-powered test light between the GRN/RED wire terminal of C310 and ground. Inspect GRN/RED wire and BLK wire to G23 for an If wires and ground are OK, replace the wiper Reconnect C310 to the wiper Turn the wiper switch to LO and operate the Ignition switch between OFF and RUN until blades are at winter (exposed) position. Turn the ignition switch OFF. Disconnect C310 from the wiper Connect a self-powered test light between CRN/RED wire terminal of C310 and ground. (Continued on following page)

13 Troubleshooting (cont'd) (Continued from page 91-13) Does the test light remain OFF? Replace wiper Disconnect C795 and C796 from wiper control unit. Connect a self-powered test light between the GRN/RED wire terminal of C310 and the GRN/ YEL wire terminal of C795, Move the winter switch to ON (summer position). Inspect GRN/RED and GRN/YEL wires to winter position switch for an If wires are OK, replace the winter position switch. Turn the wiper switch to LO. Connec t batter y positiv e to the YEL wire terminal C310 with a fused jumper, and battery negative to the BLU/RED wire terminal of C309. Does solenoid operate (listen for click)? Replace wiper Connect battery positive to the YEL wire terminal of C795 with a fused jumper, and battery negative to the BLU/RED wire terminal of C3G9. Does solenoid operate (listen for click)? Inspect YEL/WHT and YEL wires to winter position switch for an If wires are OK, replace the winter position switch. (Continued on page 91-15)

14 (Continued from page 91-14) Move the winter switch to the winter position. Inspect BLU/WHT and YEL/GRN wires to winter position switch for an Replace wiper control unit. Are BLU/WHT and YEL/ GRN wires OK? Repair wires. Replace winter position switch.

15 Troubleshooting (cont'd) Troubletree G Little or no washer fluid Is pumped. Disconnect C212 from the washer Turn the Ignition switch to RUN. Connect a test light between the BLK/YEL wire terminal of C212 and ground. Press the washer switch. Inspect BLK/YEL wire for an Connect a test light between the BLK/YEL and the BLK wire terminals of C212. Is BLK/YEL wire OK? Press the washer switch. Repair open In BLK wire to ground G5. Replace washer

WIPER/WASHER SYSTEM - FRONT ACCESSORIES & EQUIPMENT General Motors Corp. - Front Wiper/Washer System

WIPER/WASHER SYSTEM - FRONT ACCESSORIES & EQUIPMENT General Motors Corp. - Front Wiper/Washer System WIPER/WASHER SYSTEM - FRONT 1998 ACCESSORIES & EQUIPMENT General Motors Corp. - Front Wiper/Washer System DESCRIPTION & OPERATION CAUTION: To prevent scratching, wet the windshield before turning on wipers.