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Windshield Wiper Test 7A - Wiper Wash Function Not Working Properly

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.
  1. Ensure windshield washer fluid reservoir is full. Turn ignition on. Momentarily push and release wash button on stalk switch. If washer pump does not operate, go to step 3). If washer pump operates, but wipers do not operate, go to next step. If washer pump and wipers operate, system is currently operating correctly.
  2. Using scan tool, monitor front washer switch while pushing switch. If front washer switch toggles from OFF to ON, replace Body Control Module (BCM). BCM is located with junction block under driver's side instrument panel. See Figure . If front washer switch does not toggle from OFF to ON, got to next step.
  3. Turn ignition off. Remove BCM from junction block. Using external ohmmeter, measure resistance between ground and terminal No. 20 on junction block internal 23-pin connector. Press wash button. If resistance is less than 5 ohms, replace BCM. If resistance is 5 ohms or greater, replace junction block.
  4. Locate and disconnect washer pump 2-pin connector at bottom of washer fluid reservoir. Ensure connector is clean and not damaged. Using external voltmeter, measure voltage between ground and terminal No. 1 (Dark Blue wire) on washer pump connector. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step 7).
  5. Access junction block connector "B". See Figure . Do not disconnect connector. Using external voltmeter, measure voltage between ground and terminal No. 3 (Dark Blue wire). If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, repair open Dark Blue wire.
  6. Disconnect junction block connector "B". Using external ohmmeter, measure resistance between ground and terminal No. 1 (Dark Blue wire) on washer pump connector. If resistance is less than 5 ohms, repair Dark Blue wire for short to ground. If resistance is 5 ohms or greater, repair or replace or junction block.
  7. Connect jumper wire between terminals No. 3 (Dark Blue wire) and No. 21 (Brown wire) on junction block "B" connector. Using external voltmeter, backprobe junction block connector "D". Measure voltage between ground and terminal No. 18 (Brown wire). If voltage is 10 volts or less, repair open Brown wire. If voltage is greater than 10 volts, go to next step.
  8. Remove jumper wire and reconnect front washer pump connector. Connect jumper wire between ground and junction block connector "D", terminal No. 18 (Brown wire). If washer pump operates, go to next step. If washer pump does not operate, repair or replace junction block.
  9. Disconnect jumper wire. Disconnect multifunction switch. See Figure in CHIME TEST 4B. Using scan tool in voltmeter mode, measure voltage on terminal No. 11 (Brown wire). If voltage is 10 volts or less, repair open Brown wire. If voltage is more than 10 volts, replace multifunction switch.
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