S10/T10 Blazer 2WD L4-119 1.9L VIN A 2-BBL (1984)
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. 10. If motor operates at low speed, connect battery voltage to
high speed terminal 1, Fig. 10.
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. 10.
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.
Fig. 10 Permanent magnet type windshield wiper motor.1982---87 S/T 10 & 15 models
Motor Will Not Shut Off
1.
Disconnect electrical connector to wiper motor.
2.
Connect jumper wire between motor terminals 2 and 3, and apply battery voltage to terminal 4, Fig. 10.
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. 10.
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.
