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DTC B1321: A/C Low Side Temperature Sensor: Testing

  1. If body control system diagnostic check has been performed, go to next step. If body control system diagnostic check has not been performed, perform body control system diagnostic check. See BODY CONTROL SYSTEM DIAGNOSTIC CHECK  under SYSTEM TESTS.
  2. Turn ignition switch to OFF position. Disconnect A/C low side temperature sensor. Turn ignition switch to ON position. Using DVOM, measure voltage between sensor connector terminals "A" (Black wire) and "B" (Gray wire). If reading is 5 volts, go to step  4 . If reading is not 5 volts, go to next step.
  3. Using DVOM, backprobe and measure voltage between DIM connector terminals A6 (Black wire) and A7 (Gray wire). See Figure . If reading is 5 volts, go to step  6 . If reading is not 5 volts, go to step  5 .
  4. Replace A/C low side temperature sensor. After replacing sensor, go to step  7 .
  5. Replace DIM. See DASH INTEGRATION MODULE (DIM)  under REMOVAL & INSTALLATION. After replacing DIM, go to step  7 .
  6. Repair open or short in Gray or Black wire. After repairs, go to next step.
  7. Reconnect all components and connectors. Turn ignition switch to ON position. Using scan tool, clear DTCs. After clearing DTCs, perform body control system diagnostic check. See BODY CONTROL SYSTEM DIAGNOSTIC CHECK  under SYSTEM TESTS.
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