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My blower motor will not work in my 1987 4x4 Toyota pickup truck

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: have a 1993 toyota pickup 4 cyl heater blower

To find out if your problem is the blower motor or the blower resistor or switch perform the following tests.

  • Remove resistor from vehicle or disconnect resistor wiring.
  • Using an ohmmeter, ensure continuity exists between blower resistor terminals No. 1 and 4. See Fig.
  • If continuity is not as specified, replace resistor.


Switch Position (1) Continuity Between Terminal No.
  1. OFF (1)
  2. LO 5 & 6
  3. (D) (2) 1, 5 & 6
  4. (D) (3) 2, 5 & 6
  5. HI 5, 6 & 8

(1) With switch in any position, continuity should exist between terminals No. 3 and 4 for heater control illumination. With switch in OFF position, continuity should not exist between any other terminals. (2) Circle (D) closest to LO position. (3) Circle (D) closest to HI position.

  • Remove heater relay.
  • Using an ohmmeter, ensure continuity exists between heater relay terminals No. 1 and 3, and between terminals No. 2 and 4.
  • Ensure continuity does not exist between terminals No. 4 and 5. If continuity is not as specified, replace relay.
  • Ground terminal No. 3, and apply battery voltage to terminal No. 1. Ensure continuity exists between terminals No. 4 and 5.
  • If continuity is not as specified, replace relay.
  • Disconnect blower motor wiring harness connector.
  • Apply battery voltage to motor side of connector. Motor should operate smoothly.
  • If motor operation is not smooth, replace motor.

  1. Disconnect negative battery cable.
  2. Remove glove box, if necessary.
  3. Disconnect blower motor and resistor connectors.
  4. Remove 3 screws and blower motor.
  5. To install, reverse removal procedure. See Fig.


Heater Relay is located on the Relay Block, Front Right Side Of Engine Compartment
Good luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

Posted on Nov 23, 2010


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