G-Body Windshield Wiper System Diagnostics Modified Pulse - El Camino Central Forum : Chevrolet El Camino Forums
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Old 01-02-2009, 01:48 AM
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Join Date: Sep 2002
Name: Robert M.
Location: Round Rock, Republic of Texas
Year: 1987
Model: El Camino SS
Region: 13(TX)
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Posts: 4,318
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Post G-Body Windshield Wiper System Diagnostics Modified Pulse






Modified
Pulse Wiper System









Fig. 4 Modified pulse
windshield wiper motor









Wiper
Inoperative


  1. Connect a test lamp to wiper terminal No. 2, Fig. 4, and turn
    ignition ``On.'' If test lamp does not light, check for blown wiper fuse. If
    fuse is satisfactory, check for an open circuit between wiper terminal No. 2
    and fuse block.
  2. If fuse is blown in Step 1, disconnect wiring connector from wiper
    terminals 1, 2, 3, replace fuse and turn ignition ``On.'' If fuse blows, check
    for a grounded circuit between wiper terminal No. 2 and fuse block.
  3. If fuse does not blow in Step 2, reconnect wiring connector to wiper
    terminals and, with ignition ``On,'' place dash switch in ``Lo'' position. If
    fuse blows, motor is defective.
  4. If test lamp lights in Step 1, connect a test lamp between black wire with
    pink stripe and the ground. Place dash switch in ``Lo'' position and turn
    ignition ``On.'' If test lamp lights, motor is defective.
  5. If test lamp remains off in Step 4, connect a jumper wire between wiper
    terminal No. 1 and ground. Place dash switch in ``Lo'' and turn ignition
    ``On.'' If wiper operates, check for open circuit between wiper terminal No. 1
    and dash switch, an improperly grounded dash switch or a defective dash
    switch.
  6. If wiper remains inoperative in Step 5, motor is defective.

Wiper Inoperative In Delay



  1. Disconnect wiring connector from wiper terminals Nos. 6 and 7, then
    connect a voltmeter between connector terminal No. 7 and ground, Fig.
    4.
    Place dash switch in ``Mid'' delay and turn ignition ``On.'' If
    voltmeter indicates 12 volts, motor is defective.
  2. If voltmeter reading in Step 1 is zero volts, check B+ circuit to dash
    switch, wiring between dash switch and wiper and to ensure dash switch is
    satisfactory.

Wiper Will Not Pulse (Runs Continuously in Delay Mode)



  1. Disconnect wiring connector from wiper terminals Nos. 6 and 7, remove lead
    from connector that connects to wiper terminal No. 6, Fig. 4, then
    reinstall connector. Place dash switch in ``Mid'' delay and turn ignition
    ``On.'' If wiper operates properly, check for: grounded circuit between wiper
    terminal No. 6 and dash switch or a defective dash switch.
  2. If wiper runs continuously in Step 1, motor is defective.








Fig. 17 Ratchet wheel &
override switch assembly









Wiper
Will Not Shut Off


  1. Disconnect wiring connector from wiper terminals Nos. 1, 2, 3, then remove
    lead that connects to wiper terminal No. 1, then reinstall connector. Place
    dash switch in ``Off,'' and turn ignition ``On.'' If wiper shuts ``Off,''
    check for a grounded circuit between wiper terminal No. 1 and dash switch.
  2. If wiper continues to run in Step 1, remove washer
    pump cover and reconnect all disconnected wiring. Disconnect green lead
    from wiper terminal 1, place dash switch in ``Off'' and turn ignition ``On.''
    If wiper continues to run, motor is defective.
  3. If wiper shuts ``Off'' in Step 2, check if ratchet gear is opening
    override switch contacts, Fig. 17. If gear is correctly positioned and
    the switch contacts are open, check the disconnected green leads for grounds.
  4. If ratchet gear is properly positioned and the switch contacts are closed,
    torque mounting screw to 14 inch lbs., and adjust contact gap to .025
    inch.








Fig. 18 Washer relay armature
leg position 1














Fig. 19 Washer relay armature
leg position 2







Wiper
Will Not Shut Off & Washer Runs Continuously


  1. Remove washer
    pump cover and reconnect wiring. Place dash switch ``Off'' and turn
    ignition ``On.'' Check position of washer relay armature leg with unit
    operating. If relay armature is in No. 1 position, Fig. 18, check that
    Binding park switch actuator or defective park switch ratchet gear dog spring
    engages gear teeth. Tighten mounting screw or replace as required.
  2. If relay armature leg is in No. 2 position, Fig. 19, push button
    and check if relay armature leg drops on armature leg ramp and pump completes
    wash cycle and wiper shuts ``Off'' in position 1. If relay armature leg drops
    back into slot, motor is defective.
  3. If relay armature leg drops on ramp, pump completes cycle and wiper shuts
    ``Off'' in Step 2, check for loose coil on pole piece or a missing relay
    armature. If a burr is present on end of armature leg, file off burr and
    recheck unit.

Wiper Will Not Shut Off--Blades Move In & Out of Park



  1. With ignition ``On,'' check wiper operation in ``Lo'' and ``Hi'' speeds.
    If wiper operates in both speeds, motor is defective Wiper will not delay
    if operates only in ``Hi'' speed.

  2. If wiper operates in ``Hi'' speed only in Step 1, connect a jumper wire
    between wiper terminal No. 3 and the ground. Place dash switch in ``Lo'' and
    turn ignition ``On.'' If wiper still has ``Hi'' speed only, motor is
    defective.
  3. If wiper has ``Lo'' speed in Step 2, check for an open circuit between
    wiper terminal No. 3 and dash switch or a defective dash switch.

Wiper Has Hi Speed Only



  1. Connect a jumper wire between wiper terminal No. 3 and the ground. Place
    dash switch in ``Lo'' and turn ignition ``On.'' If wiper still has ``Hi''
    speed only, motor is defective.
  2. If wiper has ``Lo'' speed in Step 1, check for open circuit between wiper
    terminal No. 3 and dash switch or a defective dash switch.

Wiper Has Lo Speed Only



  1. Disconnect wiring connector from terminals 1, 2, and 3 and remove lead
    that connects to wiper terminal No. 3, then re-install connector. Place dash
    switch in ``Hi'' and turn ignition ``On.'' If wiper still has ``Lo'' speed
    only, motor is defective.
  2. If wiper has ``Hi'' speed in Step 1, check for grounded circuit between
    wiper terminal No. 3 and dash switch or a defective dash switch.

Wiper Operates Intermittently



  1. Remove wiper system fuse from fuse block and connect an ammeter across
    fuse block terminals. Place dash switch in ``Lo'' and turn ignition ``On.''
    Operate motor and after two minutes of operation, observe ammeter for lowest
    current reading. If lowest current reading was 5---6.5 amps, motor is
    defective.
  2. If lowest current reading exceeds 6.5 amps, replace wiper
    blade elements and repeat Step 1. If current draw is less than 6.5 amps,
    condition is corrected.
  3. If lowest current reading in Step 2 still exceeds 6.5 amps, disconnect
    wiper linkage from crank arm and repeat check. If current draw is below 6.5
    amps, check for binding wiper linkage. If current draw still exceeds 6.5 amps,
    motor is defective.
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