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Windshield Wiper Test 3A - Wipers Not Working In High Speed Mode

NOTE: Perform WINDSHIELD WIPER TEST 1A  before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION in BODY CONTROL COMPUTER INTRODUCTION. Perform TEST VER-1A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, actuate wipers in high speed mode. If wiper motor operates in high speed mode, go to next step. If wiper motor does not operate in high speed mode, go to step 3).
  2. Using scan tool, stop wiper actuation. Using scan tool, read intermittent wipe sensor. While observing scan tool, turn wiper switch to high position. If scan tool displays intermittent wiper voltage less than 10 volts, replace multifunction switch. If scan tool displays intermittent wiper voltage more than 10 volts, replace BCM.
  3. Using scan tool, stop wiper actuation. Disconnect HI/LO wiper relay and ensure connector is clean and not damaged. See Figure in WINDSHIELD WIPER TEST 2A  . Using scan tool in voltmeter mode, check voltage on HI/LO wiper relay cavity No. 10 (Dark Blue/Gray wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open Dark Blue/Gray wire between HI/LO wiper relay and fuse No. 15 (10-amp).
  4. Connect a jumper wire between HI/LO wiper relay cavity No. 10 (Dark Blue/Gray wire) and cavity No. 28 (Red/Yellow wire). See Figure in WINDSHIELD WIPER TEST 2A. If wiper motor does not operate in high speed, leave jumper wire connected and go to next step. If wiper motor operates in high speed, go to step 6).
  5. Disconnect wiper motor Light Gray 4-pin connector. Ensure connector is clean and not damaged. Using scan tool in voltmeter mode, check voltage on wiper motor connector terminal No. 4 (Red/Yellow wire). If voltage is more than 10 volts, replace wiper motor. If voltage is less than 10 volts, repair open in Red/Yellow wire.
  6. Disconnect jumper wire. Using an external ohmmeter, check resistance between HI/LO wiper relay cavity No. 12 (Violet/Pink wire) and chassis ground. See Figure in WINDSHIELD WIPER TEST 2A  . Using scan tool, actuate wipers in high speed mode and observe ohmmeter. If ohmmeter resistance does not pulsate, leave ohmmeter connected and go to next step. If ohmmeter resistance pulsates, replace HI/LO wiper relay.
  7. Turn ignition off and stop high speed wiper actuation. Disconnect engine 14-pin connector at BCM. Ensure connector is clean and not damaged. Connect a jumper wire between engine 14-pin connector terminal No. 8 (Violet/Pink wire) and chassis ground. If external ohmmeter resistance is less than 5 ohms, replace BCM. If external ohmmeter resistance is more than 5 ohms, repair open in Violet/Pink wire.
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