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Incorrect Ambient Temperature Reading

NOTE: Perform OTIS TEST 1A  before proceeding with this test. For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST: VER-2A  after each repair. Drive vehicle at least 3 miles (greater than 25 MPH) to update OTIS and perform VERIFICATION TEST: VER-2A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector.
  1. Disconnect and remove ambient temperature sensor. Sensor is located behind front bumper, right of center. Using external ohmmeter, measure resistance between sensor terminals and compare with AMBIENT TEMPERATURE SENSOR SPECIFICATIONS  table. Go to next step.
    AMBIENT TEMPERATURE SENSOR SPECIFICATIONS

    Ambient Temperature k/ohms
    32°F (0°C) 29.3-36.0
    50°F (10°C) 18.0-22.0
    68°F (20°C) 11.4-13.6
    77°F (25°C) 9.1-10.8
    86°F (30°C) 7.4-8.7
    104°F (40°C) 4.9-5.7
    122°F (50°C) 3.3-3.8
  2. If resistance measurement does not correspond with AMBIENT TEMPERATURE SENSOR SPECIFICATIONS  table, replace sensor. If sensor is within specification, turn ignition off. Close all vehicle doors and ensure all lights are off. Wait one minute.
  3. Using external ohmmeter, measure resistance between ground and terminal No. 1 (Dark Blue/Gray wire) on ambient temperature sensor harness connector. If resistance is less than 30 ohms, go to OTIS TEST 3B . If resistance is 30 ohms or greater, go to next step.
  4. Connect jumper wire between ground and terminal No. 1 (Dark Blue/Gray wire) on sensor connector. Disconnect Body Control Module (BCM) Bone 12-pin connector C3. BCM is mounted to junction block located behind left end cap of instrument panel. See Figure.
  5. Using external ohmmeter, measure resistance between ground and terminal No. 10 (Dark Blue/Gray wire) on Bone harness connector. If resistance is less than 5 ohms, replace BCM. If resistance is 5 ohms or greater, repair open Dark Blue/Gray wire.
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