LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry System - Remote >> Circuit Tests >> Wireless Door Lock Buzzer Circuit

Wireless Door Lock Buzzer Circuit

NOTE: Wireless door lock buzzer may be equipped with volume control. Ensure volume is set to an audible level before replacing buzzer assembly.
  1. Disconnect wireless door lock buzzer located behind driver's kick panel. Using DVOM, measure resistance between buzzer terminals. Resistance should be about 1000 ohms. Replace buzzer if necessary. If buzzer is okay, go to next step.
  2. Measure resistance between buzzer terminals with buzzer off, at minimum volume and maximum volume. See BUZZER RESISTANCE SPECIFICATIONS  table. If resistances are to specification, go to next step. If resistances are not to specification, replace buzzer.
    BUZZER RESISTANCE SPECIFICATIONS

    Buzzer Volume Ohms
    Off Infinite
    Minimum 10,000
    Maximum Zero
  3. Remove wireless door lock ECU (leave wire harness connected). Using DVOM, measure voltage (backprobe) between ground and terminal No. 3 (Red/Blue wire) at wireless door lock ECU harness connector. See Figure. Check for one short voltage signal as LOCK button is pressed on transmitter, and 2 short voltage signals as UNLOCK button is pressed on transmitter. If voltage signals are as specified, go to next step. If voltage signals are not as specified, replace wireless door lock ECU.
  4. Check for open in buzzer circuit between wireless door lock ECU and buzzer. See WIRING DIAGRAMS . Repair as necessary.
scientia non olet · About LEMON Manuals