How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Super Mechanic Your Own Question

Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 13129
Experience:  29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
2947720
Type Your Chevy Question Here...
Super Mechanic is online now
A new question is answered every 9 seconds

Where is the wiper relay on an 88 S10 Blazer?

Resolved Question:

Where is the wiper relay on an 88 S10 Blazer?
Submitted: 4 years ago.
Category: Chevy
Expert:  Super Mechanic replied 4 years ago.

Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.

 

There seems to be a little confusion about the vehicle.

 

88 or 98

 

Chevy or Ford

Customer: replied 4 years ago.

Sorry my fault. 88

 

Expert:  Super Mechanic replied 4 years ago.

I see. The 88 models didn't use a relay for the wipers. There is however, a pulse module, on the motor. Let me give you the tests for both types.

 

 

 

graphic

 

 

 

graphic

 

 

 

 

 

 

graphic

 

 

WINDSHIELD WIPERS INOPERATIVE

  1. Turn ignition switch to On.
  2. Rotate wiper switch to high speed position, then connect test lamp between motor terminal No. 1 and ground, Fig. 2.
  3. If lamp does not light, check fuse and replace as needed. If fuse is satisfactory, check for open circuit in feed wire between motor and fuse block.
  4. If fuse is blown, check for short circuit in motor or wiring to control switch.
  5. If lamp lights, rotate wiper switch to low position and connect jumper wire between motor and ground.
  6. If motor operates, check ground circuit and repair as necessary. If motor does not operate, motor is defective.

MOTOR OPERATES BUT WIPER BLADES DO NOT

  1. Check to ensure wiper linkage is not binding and that linkage is connected to crank arm.
  2. If linkage is satisfactory, motor is defective.

WIPER BLADES STOP AT RANDOM POSITION ON WINDSHIELD

  1. Remove wiper fuse, then connect ammeter across fuse block terminals. Operate wipers on dry windshield.
  2. Ammeter reading will fluctuate. If reading remains below 5 amps, motor is defective.
  3. If reading is greater than 5 amps, disconnect wiper linkage at crank arm and perform test over. If reading is now less than 5 amps, check for binding linkage and replace wiper blades.
  4. If lowest reading still exceeds 5 amps, motor is defective.

MOTOR INOPERATIVE AT LOW OR HIGH SPEED

  1. Disconnect electrical connector to wiper motor.
  2. If motor operates at high speed, connect battery voltage to low speed terminal 2, Fig. 2. If motor operates at low speed, connect battery voltage to high speed terminal 1, Fig. 2.
  3. If motor operates at affected speed, check continuity of wiring between motor and switch. If wiring is satisfactory, switch is defective.
  4. If motor fails to operate in affected speed, motor is defective.

MOTOR OPERATES AT ONE SPEED IN BOTH HIGH & LOW SWITCH POSITIONS

  1. Disconnect electrical connector to wiper motor and alternately connect battery voltage to motor low and high speed terminals, Fig. 2.
  2. If motor runs at both low and high speeds, check continuity of wiring between motor and wiper switch. If wiring is satisfactory, wiper switch is defective.
  3. If motor operates at one speed in both test positions, motor is defective.

MOTOR INOPERATIVE IN DELAY MODE

  1. Disconnect wiper switch electrical connector at pulse control module and connect ohmmeter between brown and dark green wire terminals in connector.
  2. Meter readings should be approximately 50 ohms with switch in minimum delay position to 500,000 ohms with switch in maximum delay position.
  3. If readings are as specified, pulse control module is defective. If readings are not as specified, wiper switch is defective.

MOTOR WILL NOT SHUTOFF

  1. Disconnect electrical connector to wiper motor.
  2. Connect jumper wire between motor terminals 2 and 3, and apply battery voltage to terminal 3, Fig. 2.
  3. If motor runs to park position and stops, control switch is defective.
  4. If motor does not park properly, motor is defective.

WIPERS STOP BUT DO NOT RETURN TO PARK

  1. Rotate wiper switch to off position, disconnect wiper motor electrical connector and connect jumper wire between motor terminals 2 and 3. Connect 12 volt power source to terminal 4, Fig. 2.
  2. If wipers do not return to park position, motor is defective.
  3. If wipers return to park position, connect wiper motor electrical connector and check current between terminals 2 and 3 using test lamp.
  4. If lamp lights, check for open circuit in white wire between terminal 4 and fuse block. If lamp does not light, check for open circuit in orange wire between terminal 3 and control switch.
  5. If wiring has continuity, replace control switch.

WIPERS PARK ABOVE NORMAL POSITION

  1. Rotate wiper switch to off position, disconnect wiper motor electrical connector and check continuity between motor terminal 3 and ground using test lamp.
  2. If lamp lights, check crank arm and linkage for proper installation. If lamp does not light, motor is defective.

 

 

 

Customer: replied 4 years ago.

Where is this module located on the vehicle?

 

Expert:  Super Mechanic replied 4 years ago.
On the wiper motor
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 13129
Experience: 29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Super Mechanic and 4 other Chevy Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics