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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 STS 🢒 Body 🢒 Wipers/Washer Systems 🢒 Wipers Inoperative - All Modes

Wipers Inoperative - All Modes STS

Diagnostic Aids

If the WPR MOD 30 A fuse is open, a short to ground in either one of the following circuits may be the cause:

    • Accessory voltage circuit to the wiper module
    • Windshield washer pump control circuit

If the WPR SW 7.5 A fuse is open, a short to ground in any one of the following circuits may be the cause:

    • Accessory voltage circuit to the switch
    • Windshield washer pump control circuit
    • Windshield wiper motor high speed circuit
    • Windshield wiper switch signal 1 circuit
    • Windshield wiper switch signal 2 circuit
    • Windshield wiper switch On signal circuit

Step

Action

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 the ignition ON, with the engine OFF.
  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
  1. Turn OFF the ignition.
  2. Disconnect the harness connector of the windshield wiper/washer module.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp from the accessory voltage circuit of the windshield wiper/washer module connector to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 9

4

Connect a test lamp between the accessory voltage circuit of the wiper/washer module connector and the ground circuit of the wiper/washer module connector.

Does the test lamp illuminate?

Go to Step 5

Go to Step 10

5
  1. Connect a test lamp from the windshield wiper switch signal 2 circuit of the windshield wiper/washer module connector to a good ground.
  2. Press the windshield washer switch.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Disconnect the harness connector of the windshield wiper/washer switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp from the battery positive voltage circuit of the windshield wiper/washer switch to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 11

7

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

Did you find and correct the condition?

Go to Step 14

Go to Step 12

8

Inspect for poor connections at the harness connector of 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 14

Go to Step 13

9

Repair the short to ground or open in the accessory voltage circuit of the windshield wiper/washer module. Refer to Wiring Repairs or Connector Repairs .

Did you complete the repair?

Go to Step 14

--

10

Repair the high resistance or open in the ground circuit of the windshield wiper/washer module. Refer to Wiring Repairs or Connector Repairs .

Did you complete the repair?

Go to Step 14

--

11

Repair a short to ground or open in the battery positive voltage circuit of the windshield wiper/washer switch. Refer to Wiring Repairs or Connector Repairs .

Did you complete the repair?

Go to Step 14

--

12

Replace the windshield wiper/washer module. Refer to Windshield Wiper Motor Replacement .

Did you complete the replacement?

Go to Step 14

--

13

Replace the windshield wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the replacement?

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2