GM Service Manual Online
For 1990-2009 cars only

Wipers Delay Mode Inoperative Pulse

Step

Action

Value(s)

Yes

No

1

Was the Wiper/Washer Diagnostic System Check performed?

--

Go to Step 2

Go to Wiper/Washer System Check

2

  1. Turn the ignition OFF.
  2. Disconnect wiper/washer switch connector C202.
  3. Set the wiper switch to DELAY.
  4. Measure the resistance through connector C202 from terminal A3 to terminal D3 using a DMM set to the Ohms scale.
  5. Move the wiper switch through the entire delay range.

Does the resistance vary within the specified range?

39 kohms to 680 kohms

Go to Step 4

Go to Step 3

3

Replace the wiper/washer switch. Refer to Windshield Wiper and Washer Switch Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

4

  1. Reconnect connector C202 to the wiper/washer switch connector.
  2. Disconnect the harness connector from the wiper motor assembly.
  3. Turn the ignition to ON.
  4. Set the wiper switch to HI.
  5. Measure the voltage from the wiper motor connector terminal H to ground using the DMM.

Is voltage within the specified range?

10.5-15.5 V

Go to Step 6

Go to Step 5

5

Repair the open circuit condition in CKT 477.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

6

Replace the wiper motor cover. Refer to Wiper Motor Cover Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

Wipers Delay Mode Inoperative Rainsense

Step

Action

Value(s)

Yes

No

1

Was the Wiper/Washer Diagnostic System Check performed?

--

Go to Step 2

Go to Wiper/Washer System Check

2

  1. Turn the ignition to RUN.
  2. Set the wiper switch to HI.

Are the wipers operating?

--

Go to Step 3

Go to Wipers High Mode Inoperative, Low Mode Operates

3

Set the wiper switch to the middle AUTO DELAY position.

Does the wiper system operate like a delay system?

--

Go to Step 5

Go to Step 4

4

Set the wiper switch to the next-higher sensitivity position (towards OFF).

Does an instant wipe occur when increasing sensitivity?

--

Go to Step 6

Go to Wipers Delay Mode Inoperative

5

  1. Set the wiper switch to the highest sensitivity level (towards OFF).
  2. Move the wiper switch to the second highest sensitivity position (one position away from OFF).

Does an instant wipe occur when moving the wiper switch from the maximum sensitivity position (closest to OFF) to the second highest sensitivity position?

--

Go to Step 7

Go to Step 14

6

Replace the rainsense module. Refer to Outside Moisture Sensor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

7

  1. Disconnect the connector from the rainsense module.
  2. Connect a test light between the rainsense module connector (harness side) terminals 7 and 8.

Is the test light on?

--

Go to Step 11

Go to Step 8

8

Connect a test light between rainsense module connector (harness side), terminal 8, and ground.

Is the test light on?

--

Go to Step 9

Go to Step 10

9

Repair the open circuit condition in CKT 851.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

10

Repair the open circuit condition in CKT 43.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

11

  1. Disconnect the wiper motor connector.
  2. Connect a DMM set to Ohms scale between wiper motor connector terminal F and rainsense module connector (harness side) terminal 5.

Is there continuity?

--

Go to Step 12

Go to Step 13

12

Replace the rainsense module. Refer to Outside Moisture Sensor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

13

Repair the open circuit condition in CKT 482.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

14

Does an instant wipe occur when moving the wiper switch from the second highest sensitivity position to the third highest sensitivity position?

--

Go to Step 15

Go to Step 16

15

Replace the rainsense module. Refer to Outside Moisture Sensor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

16

Does an instant wipe occur when moving the wiper switch from the third highest sensitivity position to the fourth highest sensitivity position?

--

Go to Step 17

Go to Step 18

17

Check for unclean glass or a clouded rainsense module attachment. If windshield is clean and adhesive tape is not clouded, replace the rainsense module.

Is the repair or replacement complete?

--

Go to Wiper/Washer System Check

--

18

Does an instant wipe occur when moving the wiper switch from the fourth highest sensitivity position to the fifth highest sensitivity position?

--

Go to Step 20

Go to Step 19

19

Replace the rainsense module. Refer to Outside Moisture Sensor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

20

  1. Check for an open circuit condition in CKT 481.
  2. If OK, replace the wiper motor cover. Refer to Wiper Motor Cover Replacement .
  3. If the problem persists replace the rainsense module. Refer to Outside Moisture Sensor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--