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Where is the wiper relay on an 88 S10 Blazer?

Customer Question
Where is the wiper relay on an 88 S10 Blazer?
Submitted: 8 years ago.Category: Chevy
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Answered in 2 minutes by:
10/17/2009
Chevy Mechanic: Super Mechanic, Master technician replied 8 years ago
Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17,221
Experience: 29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Verified

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

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Customer reply replied 8 years ago

Sorry my fault. 88

 

Chevy Mechanic: Super Mechanic, Master technician replied 8 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.

 

 

 

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Customer reply replied 8 years ago

Where is this module located on the vehicle?

 

Chevy Mechanic: Super Mechanic, Master technician replied 8 years ago
On the wiper motor
Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17,221
Experience: 29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Verified
Super Mechanic and 87 other Chevy Specialists are ready to help you
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Super Mechanic
Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17,221
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Experience: 29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering

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