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1996 Chevrolet Blazer: The rear wiper does not work

Customer Question

I have a 1996 Chevrolet Blazer. The rear wiper does not work. Tried a new motor but no luck. Any idea what the problem may be? Thank you
Submitted: 8 years ago.
Category: Chevy
Expert:  Bob replied 8 years ago.

Hello, below you will find the GM trouble tree for checking out the rear wiper motor circuit on your S10. It should have everything you need for testing the system and should lead you to the problem. Note that any blue high lights will not open for you as they are restricted to GM access only, thanks.

 

Body and Accessories | Wipers/Washer Systems | Diagnostic Information and Procedures | Document ID: 425973


Rear Wiper Inoperative

Step

Action

Value(s)

Yes

No

1

Was the Wiper/Washer Rear System Check performed?

--

Go to Step 2

Go to Wiper/Washer Rear System Check

2

Does the rear window washer operate normally?

--

Go to Step 3

Go to Step 8

3

  1. Disconnect the harness connector from the wiper motor.
  2. Measure the voltage at the rear wiper motor harness connector, terminal C?

Is battery voltage present?

--

Go to Step 4

Go to Step 16

4

  1. Close the endgate. Close the liftgate.
  2. Set the rear wiper switch to the position in which the rear wiper does not operate.
  3. Turn ON the ignition.
  4. Measure the voltage at the rear wiper motor harness connector, terminal B.

Is battery voltage present?

--

Go to Step 5

Go to Step 18

5

Connect a test lamp from wiper motor harness connector terminal C to terminal A.

Is the test lamp lit?

--

Go to Step 6

Go to Step 7

6

Replace the wiper motor assembly. Refer to Rear Window Wiper Motor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer Rear System Check

--

7

Repair the open in CKT 1350. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

8

  1. Turn ON the ignition.
  2. Backprobe at the wiper switch harness connector, terminal A.

Is battery voltage present?

--

Go to Step 9

Go to Step 13

9

Backprobe at the wiper switch harness connector, terminal B, while holding the washer switch in the ON position.

Is battery voltage present at terminal B?

--

Go to Rear Washer Inoperative

Go to Step 10

10

Inspect the rear wiper switch for a poor connection.

Did you find a poor connection?

--

Go to Step 11

Go to Step 12

11

Repair the poor connection. Refer to Connector Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

12

Replace the rear wiper switch. Refer to Rear Window Wiper and Washer Switch Replacement .

Is the replacement complete?

--

Go to Wiper/Washer Rear System Check

--

13

Inspect rear wiper fuse #23.

Is the fuse open?

--

Go to Step 14

Go to Step 15

14

Replace the fuse.

Is the replacement complete?

--

Go to Wiper/Washer Rear System Check

--

15

Repair the open in CKT 43. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

16

Inspect rear wiper fuse #39.

Is the fuse open?

--

Go to Step 14

Go to Step 17

17

Repair the open in CKT 1240. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

18

Measure the voltage at the wiper cutout switch, terminal A.

Is battery voltage present?

--

Go to Step 19

Go to Step 23

19

With the wiper cutout switch closed, test for continuity through the wiper cutout switch between terminal A and terminal B.

Did you find continuity?

--

Go to Step 20

Go to Step 25

20

Inspect for poor connections at the following components:

The wiper cutout switch
The wiper motor

Did you find a poor connection?

--

Go to Step 21

Go to Step 22

21

Repair the poor connection. Refer to Connector Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

22

Repair the open in CKT 393. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

23

Backprobe the wiper switch connector, terminal C.

Is battery voltage present?

--

Go to Step 24

Go to Step 10

24

Repair the open in CKT 391. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Wiper/Washer Rear System Check

--

25

Replace the wiper cutout switch. Refer to .

Is the replacement complete?

--

Go to Wiper/Washer Rear System Check

--

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