Vehicle: 2007 Toyota RAV4, 4WD, V6-3.5L (2GR-FE), Automatic Transaxle
Mileage: 190,668
Problem: The vehicle was brought to the shop because the A/C compressor would shut off intermittently, and when it did, the A/C button light flashed.
Details: The technician connected a scan tool and pulled the following diagnostic trouble codes:
B1422- Compressor Lock Sensor Circuit
B1421- Solar Sensor Circuit (Passenger Side)
B1424- Solar Sensor Circuit (Driver Side)
The technician called Tech-Assist for a strategy to diagnose this problem quickly. After looking at the A/C system wiring diagram, the Tech-Assist consultant recommended first checking resistance of the compressor lock sensor, which is located on the compressor (Connector B47). The resistance between SSR+ (pin 1 – Lt GRN) and SSR- (pin 2 – WHT/BLK) should be between 65-125 ohms. If the sensor resistance is out of specifications, the compressor needs to be replaced.
Confirmed Repair: The technician measured 250 ohms on the compressor lock sensor pins. He installed a new compressor and cleared the DTCs. The A/C system was returned to normal operation and the two solar sensor circuit DTCs did not return. Fixed!
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