Shadow Convertible V6-181 3.0L SOHC VIN 3 FI (1993)
Wiper Control Module: Testing and Inspection
Delay Mode, Wipers Run Continually During Wash, No Extra Wiping
Replace Control Unit
Excessive Delay of More Than 30 SEC or Inadequate Delay
Variations in delay should be as follows:
1. Minimum delay control to extreme counterclockwise position before first detent of one half to two seconds.
2. Maximum delay control to extreme clockwise position before off detent of ten to thirty seconds.
3. If there is excessive delay or no variations in delay proceed to intermittent wipe switch test.
Excessive Delay of More Than 30 Seconds or Inadequate Delay
1. Variations in delay should be as follows:
a. Minimum delay control to extreme counterclockwise position before first detent of 1/2 to 2 seconds.
b. Maximum delay control to extreme clockwise position before OFF detent of 15 to 25 seconds.
2. If there is excessive delay or no variations in delay, remove the wiper motor wiring harness while the motor is parked in the OFF position.
3. Remove 25-way blue connector from the body controller.
4. Set wiper control switch to maximum DELAY position.
5. With ignition switch in ON position, measure voltage between pin 9 of black connector and a good ground.
a. If voltmeter reads 0, proceed to step 6.
b. If voltmeter reads 10 to 15 volts, proceed to step 7.
6. Set wiper control switch to minimum DELAY position and measure voltage between pin 9 of blue connector and a good ground. If voltmeter reads
0, check for an open circuit in the intermittent wipe wiring harness.
7. Remove wiper motor circuit fuse.
8. Using an ohmmeter, measure the resistance between pins 9 and 22 of the body controller 25-way black connector. Set the wiper control switch first
to minimum DELAY and then maximum DELAY.
a. If resistance reading at minimum DELAY setting is between 0 and 15 ohms, and at maximum DELAY setting the resistance is between
240,000 and 400,000 ohms, replace the body controller.
b. If the resistance values above are not obtained, replace the wiper control switch.
Intermittent Wiper Motor System Test
Intermittent Wiper Motor Service Procedures for diagnosis of problems which do not involve the delay function, refer to the Two-Speed Motor Function
Tests. The two-speed functions of all wiper motors are identical.
If a problem occurs, only in the DELAY mode, the following tests are to be performed.
Wipers Do Not Come on When Switch Is In Delay Position
1. Disconnect 25-way connector (blue) from the body controller.
2. Place wiper control switch in maximum DELAY position.
3. Connect positive lead of voltmeter to pin 9 of connector (blue) and negative lead to the good ground.
a. If voltmeter reads 0, check control switch and wiring for an open circuit.
b. If voltmeter reads 10 to 15 volts, proceed to step 4.
4. Connect positive lead of voltmeter to pin 22 of blue connector and negative lead to a good ground.
a. If voltmeter reads 0, check fuses and wiring for an open circuit.
b. If voltmeter reads 10 to 15 volts, reconnect body controller and proceed to step 5.
5. Connect positive lead of voltmeter to pin 24 of blue connector and negative lead to the metal case of the body controller. Disconnect wiring
harness from wiper motor. Set control switch to the minimum delay mode.
a. If voltmeter reads 0, check wiring from the intermittent wipe switch to body controller for an open circuit.
b. If voltmeter reads 10 to 15 volts, proceed to step 6.
6. Connect voltmeter to pin L of the Intermittent wiper switch. Place intermittent wiper switch in the Max. Delay position.
a. If voltmeter reads zero volts, change the intermittent wiper switch.
b. If voltmeter reads 10-15 volts, check the wiring. harness from the intermittent wiper switch to the wiper motor for an open circuit.
7. If all tests above have been performed and the problem was not found, replace the control unit.
Wipers Do Not Run Continually When Wash Is Operated In Delay
1. Disconnect 25-way blue connector from the body controller
2. Using a voltmeter, connect the positive lead to pin 10 of the (Black) connector. Connect negative lead to the body computer metal case.
3. Set wiper control switch to DELAY position.
4. Depress wash switch.
5. If voltage reads 0, check switch relay and wiring.
6. If voltage is between 10 and 15 volts, the problem is in the body controller.
Wipers Start Erratically During Delay Mode
1. Verify that the ground connection at the instrument panel is making a good connection, free from paint and is tight.
