LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1992 >> SC 400 >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel >> Circuit Testing >> Hazard Warning Circuit Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Hazard Warning Circuit Test

  1. Remove hazard warning switch. See HAZARD WARNING SWITCH  under REMOVAL & INSTALLATION. Using a DVOM, check for voltage between terminal No. 8 and ground. See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, check HAZ-HORN fuse and wiring between fuse and switch.
  2. Check for voltage between terminal No. 10 and ground. With ignition switch in LOCK or ACC position, voltage should not exist. If voltage does not exist, go to next step. If voltage exists, check for short to power. See appropriate chassis wiring diagram in WIRING DIAGRAMS.
  3. Turn ignition on. If battery voltage now exists, go to next step. If voltage does not exist, check TURN fuse and wiring between ignition switch and hazard warning switch. See appropriate chassis wiring diagram in WIRING DIAGRAMS.
  4. Check for voltage between terminal No. 2 and ground. With headlight switch in OFF position, no voltage should exist. If voltage exists, check for short to power. Turn headlight switch to TAIL or HEAD position. If battery voltage now exists, go to next step. If voltage does not exist, check wiring between headlight switch and hazard warning switch.
  5. Check for continuity between ground and terminals No. 3, 5 and 6. Terminals No. 5 and 6 will have slight resistance as they are grounded through bulbs. If continuity does not exist on any wire, check wiring. See appropriate WIRING DIAGRAMS.
scientia non olet · About LEMON Manuals