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Home >> Lexus >> 1990 >> LS 400 >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Testing >> Wiper Relay >> Intermittent Relay Operation

Intermittent Relay Operation

  1. Connect jumper wire between battery positive terminal and wiper relay terminal No. 2. Connect a second jumper wire between negative battery terminal and wiper relay terminal No. 7. See Figure. Connect voltmeter positive lead to wiper relay terminal No. 5 and negative lead to terminal No. 7. No voltage should exist.
  2. Connect negative lead from battery to wiper relay terminal No. 4. Ensure voltage varies from zero to battery voltage in 4-second intervals. If voltage varies, go to next step. If voltage does NOT vary, replace relay.
  3. Connect jumper wire between wiper relay terminals No. 3 and 8. Ensure voltage varies from zero to battery voltage in 2-second intervals. If voltage varies, go to WASHER SWITCH ON OPERATION. If voltage does NOT vary, replace relay.