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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Harness inspection. Turn ignition switch "OFF". Disconnect BCM connector and combination switch connector. Check harness side continuity between BCM harness connector (M19), terminal No. 49 (Green/Black) input 2 wire and combination switch connector (M28), terminal No. 2 (Green/Black) input 2 wire and between BCM harness connector (M19), terminal No. 40 (Red/Black) output 2 wire and combination switch connector (M28), terminal No. 7 (Red/Black) output 2 wire. See Figure and Figure . If continuity exists, go to next step. If continuity does not exist, check harness between BCM and combination switch for open or short circuit. See EXTERIOR LIGHTS in 2002 SYSTEM WIRING DIAGRAMS NISSAN - ALTIMA article.
  2. Inspection of BCM input terminal voltage. Connect BCM connector. Turn ignition switch "ON". Check voltage of BCM connector (M19), terminal No. 49 (Green/Black) input 2 wire, harness side. If voltage is greater than 4.5 volts, go to next step. If voltage is not greater than 4.5 volts, replace BCM. See REMOVAL & INSTALLATION  .
  3. BCM output terminal inspection. Connect combination switch connector. Turn ignition switch "ON". Check BCM connector (M19), terminal No. 40 (Red/Black) output 2 wire, harness side, voltage waveform. See Figure . If voltage waveform is OK, there is a combination switch malfunction, go to next step. If voltage waveform is not OK, replace BCM. See REMOVAL & INSTALLATION  .
  4. Combination switch inspection. Replace wiper switch. Confirm self-diagnostic results again, see COMBINATION SWITCH INSPECTION ACCORDING TO SELF-DIAGNOSTIC RESULTS  . If combination switch is OK, inspection is complete. If combination switch is not OK, confirm symptom again. See SYSTEM TESTS  .
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