LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1995 >> SC 400 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry System >> Circuit Testing >> Transmitter Battery Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Transmitter Battery Test

NOTE: If it is difficult or impossible to operate the system, use this procedure to indirectly test for a weak transmitter battery.
  1. Remove screw, cover, "O" ring and battery from ignition key. Connect 2 new 1.5-volt dry-cell batteries in series. See Fig 1. Connect positive lead to side terminal and negative lead to bottom terminal.
  2. Push transmitter button. If door locks operate, replace transmitter battery. If door locks do not operate, replace transmitter and ROM (ROM is inside of remote door lock ECU). To prevent reuse, destroy old transmitter and ROM.
Fig 1: Testing Transmitter Battery
G93I84077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002