Light Sensor Circuit
Turn ignition off. Disconnect harness connector from light sensor. Check continuity between chassis ground and the following light sensor harness connector terminals. (Scheme 3) If continuity is as specified, check circuit voltage. See VOLTAGE TESTS.
- Terminal No. 3 - With driver's door closed (door courtesy switch contacts open), there should be no continuity. With driver's door open (door courtesy switch contacts closed), there should be continuity.
- Terminal No. 4 - There should be continuity at all times.
- Terminal No. 5 - With headlight switch in any position except HEAD, there should be no continuity. With headlight switch in HEAD position, there should be continuity.
- Terminal No. 6 - With headlight switch in any position except AUTO, there should be no continuity. With headlight switch in AUTO position, there should be continuity.
- Terminal No. 7 - With headlight switch in any position except TAIL, there should be no continuity. With headlight switch in TAIL position, there should be continuity.
Leave harness connector attached to light sensor. Check voltage between chassis ground and the following light sensor connector terminals (backprobe terminals). (Scheme 3) If voltage is as specified, light sensor may be faulty.
- Terminal No. 1 - With ignition switch in ON position, voltage should be at least 10 volts. With ignition switch in OFF position, voltage should be one volt or less.
- Terminal No. 2 - Battery voltage should be present at all times.
- Terminal No. 3 - With driver's door closed (door courtesy switch contacts open), voltage should be at least 9 volts. With driver's door open (door courtesy switch contacts closed), voltage should be one volt or less.
- Terminal No. 5 - With vehicle parked in a dark area, voltage should be 1.8 volts or less. With dimmer switch in FLASH position, voltage should be 0.3 volt or less.
- Terminal No. 6 - With vehicle parked in a dark area, voltage should be 1.5 volts or less.
- Terminal No. 8 - With vehicle parked in direct sunlight (light sensor uncovered), voltage should be at least 3.7 volts. With vehicle parked in slightly shaded area (light sensor covered and taillights on), voltage should be about 1.3-2.3 volts. With vehicle parked in a dark area (light sensor covered and headlights on), voltage should be .42 volt.
