LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1990 >> LS 400 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostics >> Diagnostic Code Check/Chart >> Indicator Light Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Indicator Light Check

  1. Turn ignition ON. Ensure CRUISE MAIN indicator light on instrument cluster comes on when cruise control main switch is turned on. Ensure indicator light goes off when main switch is turned OFF.
  2. If indicator light operates as indicated, go to diagnostic code output. If indicator light does not operate as indicated, unplug connector "B" from instrument cluster. See Figure.
  3. Ground terminal No. 16 and turn ignition On. If CRUISE MAIN indicator light comes on, inspect wiring harness between terminal No. 16 and cruise control ECU. Also check ECU for proper operation.
  4. If CRUISE MAIN indicator light did not come on, check for burned out bulb. Replace bulb if necessary and repeat INDICATOR LIGHT CHECK. If bulb is okay, replace instrument cluster circuit plate (printed circuit). Repeat INDICATOR LIGHT CHECK.
scientia non olet · About LEMON Manuals