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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1219 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Windshield Wiper System Malfunction >> Circuit/System Verification
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Circuit/System Verification

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  1. Observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off, Intermittent, Low, and High.
    • If the Windshield Wiper Switch parameter is incorrect in the Low or High switch positions, refer to the Multifunction Switch Circuit Test and/or the Turn Signal Multifunction Switch Component Test below.
  2. Observe the scan tool BCM Wiper Park Switch parameter. The reading should display Active when the wipers are parked and Inactive with the wipers ON or out of the park position.
    • If the Wiper Park Switch parameter is always Active or Inactive, refer to Wipers do not Park Circuit Test below.
  3. Connect a test lamp between the TP 1 terminal in the underhood fuse block and ground.
  4. Verify the test lamp turns on and off while turning the windshield wiper switch between LOW and OFF.
    • If the test lamp does not turn on and off while changing between the commanded states, refer to WIPER 1 Relay Control Circuit Test below.
  5. Ignition ON, operate the windshield wiper switch through the Delay, Low, and High positions.
    • If the windshield wipers are inoperative in 1 or more of the delay settings only, test or replace the turn signal multifunction switch.
    • If the windshield wipers operate at high speed while the switch is in the Low position, refer to WIPER 2 Relay Control Circuit Test below.
    • If the windshield wipers operate at low speed while the switch is in the High position, refer to WIPER 2 Relay Control Circuit Test below.
    • If the windshield wipers are inoperative in the Low or High switch positions, refer to Wiper Motor Circuit Test and/or the Wiper Motor Component Test below.
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