Windshield Wiper Test 8A - Wiper Constantly Operating With Switch In Off Position
NOTE:
Perform WINDSHIELD WIPER TEST 1A
before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For wiring diagrams, refer to WIRING DIAGRAMS
. Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE
.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
- Ensure ignition and wiper switch are in OFF position. Using scan tool, read intermittent wiper voltage. If voltage is .1 volts or less, go to next step. If voltage is more than .1 volts, replace multi-function switch.
- Remove front wiper HI/LO relay in Power Distribution Center (PDC). See Figure in EXTERIOR LIGHTS TEST 2A. If wipers stop operating, go to next step. If wipers continue to operate, go to step 5).
- Install front wiper HI/LO relay. Replace front wiper ON relay in Power Distribution Center (PDC) with known good relay. If wipers stop operating, replace relay. If wipers continue to operate, go to next step.
- Remove substitute wiper ON relay. Disconnect Body Control Module (BCM) connector "B". BCM is located with junction block under driver's side instrument panel. See Figure . Using external ohmmeter, measure resistance between ground and terminal "C" on wiper relay socket. If resistance is less than 100 ohms, repair wiper ON relay control circuit (Red/Violet wire) for short to ground. If resistance is 100 ohms or greater, replace BCM.
- Disconnect wiper module connector. See Figure in WINDSHIELD WIPER TEST 2C. Using external voltmeter, measure voltage between ground and terminal No. 1 (Brown/White wire) on module harness connector. If voltage is greater than .5 volts, repair Brown/White wire for short to voltage. If voltage is .5 volts or less, repair Red/Yellow wire (HI/LO wiper relay HI speed output circuit) between PDC and wiper module.