Service Procedure

NOTE
THIS TSB IS INTENDED TO HELP IDENTIFY AND DIAGNOSE ERRATIC WIPER CONDITIONS. IF THE WIPER SYSTEM IS COMPLETELY INOPERATIVE, PLEASE REFER TO SECTION 01-16 OF THE APPROPRIATE MODEL YEAR WORKSHOP MANUAL FOR DIAGNOSIS AND REPAIR.

NOTE
OVERALL WIPER SYSTEM INTEGRITY SHOULD BE CHECKED, BOTH MECHANICAL AND ELECTRICAL, BEFORE PERFORMING THIS ARTICLE. INSPECT ALL WIPER RELATED WIRING HARNESS CONNECTORS FOR CORROSION AND FULLY SEATED INSTALLATION. INSPECT MECHANICAL LINKAGE FOR DAMAGE OR BINDING. SERVICE AS NEEDED.

NOTE
IF WIPER MOTOR AND WIPER MOTOR WIRING KIT WERE INSTALLED PER TSB 95-8-2, CHECK THAT THESE REPAIRS WERE PERFORMED CORRECTLY.

1. Perform Cold System Test.





NOTE
COMPLETE ALL STEPS OF THIS TEST EVEN IF A FAILURE IS VERIFIED AT ANY POINT OF THIS EXERCISE. USE THE TABLE IN FIGURE 1 TO RECORD WIPER OPERATION IN STEPS C, D AND E.

a. Engine must be running with the hood closed.

b. IMPORTANT: Wet windshield with water to prevent wiper blades from wearing prematurely.

c. Run wipers on Low speed for 1 minute.

d. Run wipers on High speed for 1 minute.

e. Run wipers on Interval, allowing wipers to cycle 5 times in each of the 7 modes of delay.

f. If BOTH wiper system failures are verified during this test (as defined in Step 3), proceed to Step 3.

g. If ONE or NO wiper system failures are verified (as defined in Step 3), proceed to Step 2 and perform the Warm System Test.

2. Perform Warm System Test.

NOTE
COMPLETE ALL STEPS OF THIS TEST EVEN IF A FAILURE IS VERIFIED AT ANY POINT OF THIS EXERCISE. USE THE TABLE IN FIGURE 1 TO RECORD WIPER OPERATION IN STEPS C, D AND E.

a. Engine must be running with hood closed.

b. IMPORTANT: Wet windshield with water to prevent wiper blades from wearing prematurely.

c. Run wipers on Low speed for 5 minutes.

d. Run wipers on High speed for 15 minutes.

e. Run wipers on Interval, allowing wipers to cycle 5 times in each of the 7 modes of delay.

f. If a wiper system failure is verified during this test (as defined in Step 3), proceed to Step 3.

g. If no wiper system failures are verified, recheck procedures Step 1 through 2.

3. Repair the wiper system by evaluating its operation and comparing to the following symptoms.





NOTE
REFER TO FIGURE 2 FOR WIPER BLADE LOCATION TERMINOLOGY.

^ SYMPTOM # 1. If wiper blades go to the park position or stay in the rest position - replace the multi-function switch (wiper switch). Refer to parts list at the end of this article.

^ SYMPTOM # 2. If wiper blades stop movement anywhere in mid-wipe travel during Low, High or Interval modes - replace the wiper motor. Refer to parts list at the end of this article.

a. If both symptoms are observed during the System Tests, replace both the multi-function switch and the wiper motor. Refer to parts list at the end of this article.

b. If only one of the symptoms are observed after completing both the Cold and Warm system tests, replace the component which corresponds with the observed symptom.

c. Continue to Step 4 after repairs are completed.

4. Repair Verification.

a. Engine must be running with hood closed.

b. IMPORTANT: Wet windshield with water to prevent wiper blades from wearing prematurely.

c. Run wipers on Interval, allowing wipers to cycle 3 times in each of the 7 modes of delay.

d. Run wipers in Low and High speeds for 5 cycles.

5. If wiper system problems continue, verify all preliminary checks were performed completely. Refer to section 01-16 of the appropriate model year Workshop Manual for further diagnosis and repair. Verify system has good power and ground as illustrated in Electrical & Vacuum Troubleshooting Manual (EVITM) Section 80-1.

NOTE
SOME VEHICLES MAY REQUIRE A WIPER MOTOR WIRING KIT TO BE USED IN CONJUNCTION WITH A NEW WIPER MOTOR. REFER TO TSB 95-8-2 FOR YOUR SPECIFIC APPLICATION AND ORDER THE CORRESPONDING WIPER MOTOR WIRING KIT AS NEEDED.