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Sensor Resistance Test

  1. Remove solar sensor. See SOLAR SENSOR  under REMOVAL & INSTALLATION. Unplug solar sensor harness connector. Cover sensor with cloth. Connect positive lead of ohmmeter to sensor terminal No. 2 (Brown/White wire). Connect negative lead of ohmmeter to sensor terminal No. 1 (Yellow/Green wire). Record sensor resistance. Remove cloth. Subject sensor to bright light, and measure resistance between sensor terminals.
  2. If resistance is not as specified, replace sensor. See SOLAR SENSOR CONTINUITY SPECIFICATIONS  table. If resistance is within specification, inspect wiring harness and connectors between sensor and A/C-heater control panel. Repair as necessary. If wiring harness and connectors are okay, temporarily substitute a known-good A/C-heater control panel, then retest system.
SOLAR SENSOR CONTINUITY SPECIFICATIONS

Condition (1) Ohms
Sensor Covered By Cloth More Than 4000
Sensor Subjected To Bright Light Less Than 4000
(1) As light intensity increases, resistance should decrease.
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