CHAPTER Horn, Wiper, and Blower Motor Circuits 23 Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance,

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CHAPTER Horn, Wiper, and Blower Motor Circuits 23 Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman AUTOMOTIVE ELECTRICAL AND ENGINE PERFORMANCE

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.1 Two horns are used on this vehicle. Many vehicles use only one horn, often hidden underneath the vehicle.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.2 A typical horn circuit. Note that the horn button completes the ground circuit for the relay.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.3 Horns typically mount to the radiator core support or bracket at the front of the vehicle.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.4 A circuit diagram is necessary to troubleshoot a windshield wiper problem.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.5 The motor and linkage bolt to the body and connect to the switch with a wiring harness.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.6 A typical wiper motor with the housing cover removed.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.7 A wiring diagram of a two-speed windshield wiper circuit using a three-brush, two-speed motor.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.8 A wiring diagram of a three-speed windshield wiper circuit using a two-brush motor, but both a series-wound and a shunt field coil.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure 23.9 A variable pulse rate windshield wiper circuit.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A wiper motor connector pin chart.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure The wiper motor and linkage mount under the cowl panel on many vehicles.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A single wiper arm mounts directly to the motor on most rear wiper applications.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure Circuit diagram of a rheostat-controlled, electronically timed interval wiper.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure Disconnect the hose at the pump and operate the switch to check a washer pump.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure Washer pumps usually install into the reservoir and are held in place with a retaining ring.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A typical rain sensing module located on the inside of the windshield near the inside rearview mirror.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure The electronics in the rain sense wiper module can detect the presence of rain drops under various lighting conditions.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A squirrel cage blower motor.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A typical blower motor circuit with four speeds.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A typical blower motor resistor pack used to control blower motor speed.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure A brushless DC motor that uses the body computer to control the speed.

Copyright © 2016 by Pearson Education, Inc. All Rights Reserved Automotive Electrical and Engine Performance, 7e James D. Halderman Figure Using a mini AC/DC clamp-on multimeter to measure the current drawn by a blower motor.