GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Wipers Inoperative - One or More Modes

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for continuity through the 24K ohms resistor in the windshield wiper/washer switch. The connector behind the instrument panel knee bolster is suitable for performing this step.

    2.

  2. This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from high to low as the delay speed is increased. The connector behind the instrument panel knee bolster is suitable for performing this step.

Step

Action

Values

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn ON the ignition.
  2. Operate the windshield wiper/washer switch through all the switch positions.

Does the windshield wiper/washer system operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Do the windshield wipers operate in the high speed mode?

--

Go to Step 5

Go to Step 4

4
  1. Disconnect the windshield wiper motor connector.
  2. Connect a test lamp from the windshield wiper motor high speed circuit terminal to ground.
  3. Turn ON the ignition.
  4. Operate the windshield wiper/washer switch to the high speed position.

Does the test lamp illuminate?

--

Go to Step 14

Go to Step 9

5
  1. Disconnect the windshield wiper motor connector.
  2. Connect a test lamp from the windshield wiper switch signal 2 circuit terminal to ground.
  3. Turn the ignition ON.
  4. Press the windshield washer switch.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 10

6
  1. Connect a test lamp from the windshield wiper switch signal 1 circuit terminal to ground.
  2. Operate the windshield wiper/washer switch to the following positions:
    3. • MIST
    • LO
    • HI

Does the test lamp illuminate in the listed switch positions?

--

Go to Step 7

Go to Step 11

7

  1. Disconnect the windshield wiper/washer switch connector.
  2. Measure the resistance through the windshield wiper/washer switch from the signal 2 circuit terminal to the accessory voltage circuit terminal of the wiper/washer switch.
  3. Operate the windshield wiper/washer switch to the following positions:
    4. • MIST
    • INT
    • LO
    • HI

Is the resistance at or near the specified value in all the listed switch positions?

24 K ohms

Go to Step 8

Go to Step 12

8

  1. Measure the resistance through the windshield wiper/washer switch from the signal 1 circuit terminal to the accessory voltage circuit terminal of the wiper/washer switch.
  2. Operate the windshield wiper/washer switch through all of the delay positions.

Does the resistance remain within the specified values from high to low as the delay speed is increased?

38K - 690K ohms

Go to Step 14

Go to Step 12

9

Test the windshield wiper motor high speed circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 16

Go to Step 12

10

Test the windshield wiper switch signal 2 circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 16

Go to Step 12

11

Test the windshield wiper switch signal 1 circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 16

Go to Step 12

12

Inspect for poor connections at the windshield wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

13

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

Is the repair complete?

--

Go to Step 16

--

14

Inspect for poor connections at the windshield wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 16

Go to Step 15

15

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

Is the repair complete?

--

Go to Step 16

--

16

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3