Component Tests

Switch Tests, Window

Master Window Control Switch

Single Switch

NOTE: Remove window regulator control switch (14529) from the vehicle as described in Removal and Installation, Window Regulator Control Switch in this section. The raised portion of the switch knob should face right exposing the five terminals.

1. Use a self-powered test lamp or an ohmmeter to test the power window regulator control switch.

2. With the window regulator control switch in the neutral position, there should be continuity between terminals 1 and 2, and terminals 3 and 4. Terminal 5 should be disconnected from all other terminals.

3. When the raised portion of the switch rocker knob is pushed, closing windows, there should be continuity between terminals 1 and 5, and terminals 3 and 4. Terminal 2 should be disconnected from all other terminals.

4. When the depressed portion of the switch rocker knob is pushed, opening the windows, there should be continuity between terminals 1 and 2, and terminals 4 and 5. Terminal 3 should be disconnected from all other terminals.

5. If the window regulator control switch does not test as stated, replace window regulator control switch.

   
   
   Window Regulator Control Switch
   
   
   
   
   
   
   

   Pin Number	Circuit	Circuit Function
   1	314 (T/LB)	Left Front Window Regulator Switch to Right Front Window Regulator Switch
   2	334 (R/Y)	Window Regulator Switch to Window Regulator Motor
   3	170 (R/LB)	Window Regulator Switch Feed
   4	333 (Y/R)	Window Regulator Switch to Window Regulator Motor
   5	313 (W/Y)	Left Front Window Regulator Switch to Right Front Window Regulator Motor Switch

   
   

Heated Back Window Switch and Light, Control Assembly Test

1. Ground Pin 4 and connect a jumper wire between Pins 3 and 2.

2. Apply power to Pin 2. The indicator should not light.

3. Momentarily actuate control to the ON position. The indicator should come on and stay on after the control returns to the normal position.

4. The indicator should go off under the following conditions:

   1. If control is depressed to OFF.
   2. If power to ignition switch accessory terminal is removed or approximately 10 minutes have elapsed.

5. Apply 12 volts power to Pin 5. The ISO bulb should light.

   
   
   Heated Back Window Switch Connector, Bronco
   
   
   
   
   
   
   

   Pin Number	Circuit	Circuit Function
   1	186 (BR/LB)	Heated Back Window Switch to Heated Back Window Grid
   2	185 (BK)	Battery Feed to Heated Back Window Switch and Grid
   3	8 (O/Y)	Heated Back Window Timing Circuit Feed
   4	57 (BK)	Ground Circuit
   5	19 (LB/R)	Instrument Panel Lamps Feed

   
   

Tailgate Switch, Instrument Panel-Mounted Bronco Only

1. NOTE: Remove window regulator control switch from the vehicle, as described in Removal and Installation, Window Regulator Control Switch in this section.

   Use a self-powered test lamp, or an ohmmeter to test the window regulator control switch.

2. With the window regulator control switch in the neutral position, there should be continuity between terminals 1 and 2, and terminals 3 and 4. Terminal 5 should be disconnected from all other terminals.

3. When the switch rocker knob is pushed up to close the tailgate window, there should be continuity between terminals 1 and 2, and terminals 4 and 5. Terminal 3 should be disconnected from all other terminals.

4. When the switch rocker knob is pushed down to open the back window glass (42006), there should be continuity between terminals 2 and 5, and terminals 3 and 4. Terminal 1 should be disconnected from all other terminals.

5. If the window regulator control switch does not test as stated, replace the switch.

   
   
   
   
   
   
   

   Pin Number	Circuit	Circuit Function
   1	57 (BK)	Ground Circuit
   2	405 (P/LB)	Window Regulator Switch to Back Window Switch
   3	57 (BK)	Ground Circuit
   4	404 (P/LG)	Window Regulator Switch to Back Window Switch
   5	400 (LB/BK)	Power Window Switch Feed

   
   

Tailgate Window Regulator Control Switch, Tailgate-Mounted

Testing of the tailgate-mounted window switch can be performed with the switch installed in the vehicle. Use a self-powered test lamp or an ohmmeter.

1. With the switch in the neutral position, there should be continuity between terminals 1, 2 and 3.

2. With the back window glass up, there should be continuity between terminals 1 and 5, and 2 and 4.

3. With back window glass down, there should be continuity between terminals 2 and 5, and 3 and 4.

4. If the switch does not test as stated, replace switch.

   
   
   
   
   
   
   

   Pin Number	Circuit	Circuit Function
   1	57 (BK)	Ground Circuit
   2	405 (P/LB)	Window Regulator Switch to Back Window Switch
   3	57 (BK)	Ground Circuit
   4	404 (P/LG)	Window Regulator Switch to Back Window Switch
   5	400 (LB/BK)	Power Window Switch Feed
   6	407 (T/BK)	Window Regulator Switch Rear to Limit Switch
   7	333 (Y/R)	Window Regulator Switch to Window Regulator Motor

   
   

Window Regulator Electric Drive

To test window regulator electric drive current draw, remove the front door trim panel (23942) or tailgate trim panel. Refer to Section 01-05.

1. Disconnect the window regulator electric drive lead.

2. Disconnect the window regulator control switch from the window regulator electric drive.

3. Supply power to window regulator electric drive lead connector with an ammeter in series.

4. NOTE: The current draw for the no-load test should not exceed four amps and should not fluctuate. Reversal of the window regulator electric drive wire connections will reverse the direction of window regulator electric drive rotation.

   Operate the window regulator electric drive and observe the current draw.

5. Replace the window regulator electric drive if the current draw exceeds four amps.

6. If the window regulator control switch does not test as stated, replace the switch.

   
   
   
   
   

Heated Back Window Grid Wire Test

1. Using a strong light inside vehicle, visually inspect wire grid from outside. A broken grid wire will appear as a brown spot.

2. Run engine at idle. Set the heated back window switch and light (18C621) to ON. The indicator lamp should come on.

3. Working inside vehicle with Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, contact broad (bus bars) red-brown strips on sides of rear window. The meter should read 10-13 volts. A lower voltage reading indicates a loose ground wire (pigtail) connection at grounded side of glass.

4. Contact a good ground point with negative lead of meter. The voltage reading should not change.

5. With negative lead of the meter grounded, touch each grid line of heated back window at its midpoint with positive lead. A reading of approximately 6 volts indicates that the line is good. A reading of zero volts indicates that the line is broken between midpoint and the positive side of the grid line. A reading of 12 volts indicates that the circuit is broken between midpoint of grid line and ground.