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Home >> Lexus >> 2001 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Systems >> Circuit Tests >> Ignition Switch Power Source Circuit (Body No. 4 Ecu)
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Ignition Switch Power Source Circuit (Body No. 4 Ecu)

  1. Check D/C CUT and RR ACC fuses located in luggage compartment junction block. Replace as necessary. If fuses are okay, ensure ignition is off. Disconnect luggage room junction block (body No. 4 ECU) connector. Measure voltage between terminal GND and terminals MPX-IG and ACC. See PIN VOLTAGE TESTS . If 10-14 volts are not present, go to next step. If 10-14 volts are present, go to next test listed in BODY NO. 4 CONTROL SYSTEM  table under TROUBLE SHOOTING .
  2. Check wiring and connectors between body No. 4 ECU and ground. Repair circuit as necessary. If wiring is okay, check wiring and connectors between body No. 4 ECU and battery. Repair circuit as necessary.
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