GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Astro - 4WD 🢒 Body and Accessories 🢒 Wipers/Washer Systems 🢒 Rear Wiper Delay Mode Inoperative

Step

Action

Value(s)

Yes

No

Schematic Reference: Wiper/Washer Schematics

DEFINITION: The Delay mode is inoperative or operates at the on speed, and the wiper does not park.

1

Did you review the Rear Wiper/Washer System Description and Operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms - Wiper/Washer Systems

2
  1. Turn the ignition on.
  2. Turn the rear wiper/washer switch through all the switch positions.

Does the rear wiper/washer system operate normal?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  1. Disconnect the rear wiper motor module switch input connector.
  2. Connect a test lamp from the rear wiper washer switch delay/on signal circuit terminal to ground.
  3. Turn the ignition on.
  4. Turn the rear wiper/washer switch to the delay position.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 10

4

With the test lamp connected as in the previous step, turn the rear wiper/washer switch to the on position.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 13

5
  1. Connect a test lamp from the rear wiper washer switch park/delay signal circuit terminal to ground.
  2. Turn the ignition on.
  3. Turn the rear wiper/washer switch to the off position.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 11

6

With the test lamp connected as in the previous step, turn the rear wiper/washer switch to the delay position.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 13

7

With the test lamp connected as in the previous step, turn the rear wiper/washer switch to the on position.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 8

8
  1. Reconnect the rear wiper motor module switch input connector.
  2. Turn the rear wiper/washer switch to the off position.

    3. Turn the ignition on.

  3. Using a test lamp backprobe from the wiper motor park switch reference voltage circuit terminal B in the wiper motor connector to ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 14

9
  1. Operate the rear wiper in any mode.
  2. Turn the ignition off while the wiper arm is in the up position.
  3. Disconnect the wiper motor connector.
  4. Test the resistance through the wiper motor park switch from the reference voltage circuit terminal B to the signal circuit terminal E.

Is the resistance within the specified values?

0-2ohms

Go to Step 14

Go to Step 15

10

Test and repair the delay/on signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

11

Test and repair the park/delay signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

12

Test and repair the park/delay signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

13

Replace the rear wiper/washer switch. Refer to Accessory Switch Replacement in Instrument Panel, Gauges, and Console.

Is the repair complete?

--

Go to Step 16

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14

Replace the rear wiper motor module.

Is the repair complete?

--

Go to Step 16

--

15

Replace the rear wiper motor. Refer to Liftgate Wiper Motor Replacement .

Is the repair complete?

--

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3