LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1999 >> RX 300 AWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Systems >> Circuit Tests >> Light Sensor Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Light Sensor Circuit

NOTE: LEXUS scan tool must be used for this test.
  1. Using scan tool, check light sensor output frequency. If light sensor output frequency is 47-1200 Hertz, go to next step. If light sensor output frequency is not 47-1200 Hertz, replace light sensor and retest system operation.
  2. Check circuits for faults between light sensor and body control ECU. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, check body control ECU pin voltages. See BODY CONTROL ECU PIN VOLTAGE TESTS  under COMPONENT TESTS. Replace as necessary and retest system operation.
scientia non olet · About LEMON Manuals