SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 54 (AUTOMATIC A/C SYSTEMS)DTC TROUBLESHOOTINGDTC INDICATOR LIGHT C: AN OPEN IN THE OUTSIDE AIR TEMPERATURE SENSOR CIRCUIT
2004 Acura 3.5RL

DTC indicator light C: An Open in the Outside Air Temperature Sensor Circuit

2004 Acura 3.5RLSECTION DTC indicator light C: An Open in the Outside Air Temperature Sensor Circuit
WARNING: This page is about a different car, the 2003 Acura 3.2CL and 2002 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT ).
  2. Measure the resistance between the No. 1 and No. 2 terminals of the outside air temperature sensor.

    * Dip the sensor in ice water, and measure resistance. Then pour hot water on the sensor, and check for change in resistance.

    Fig 1: Measuring Resistance Of The Outside Air Temperature Sensor & Temperature/Resistance Chart
    G01165203Courtesy of AMERICAN HONDA MOTOR CO., INC.
    1. YES  : Go to step 3.
    2. NO  : Replace the outside air temperature sensor.
  3. Disconnect climate control unit connector B (20P).
  4. Check for continuity between the No. 4 terminal of climate control unit connector B (20P) and the No. 1 terminal of the outside air temperature sensor 2P connector.
    Fig 2: Checking Continuity Between The No. 4 Terminal Of Climate Control Unit Connector B (20P) And The No. 1 Terminal Of The Outside Air Temperature Sensor 2P Connector
    G01165204Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity  ?

    1. YES  : Go to step 5.
    2. NO  : Repair open in the wire between the climate control unit and the outside air temperature sensor.
  5. Check for continuity between the No. 15 terminal of climate control unit connector B (20P) and the No. 2 terminal of the outside air temperature sensor 2P connector.
    Fig 3: Checking Continuity Between The No. 15 Terminal Of Climate Control Unit Connector B (20P) And The No. 2 Terminal Of The Outside Air Temperature Sensor 2P Connector
    G01165205Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity  ?

    1. YES  : Check for loose wires or poor connections at climate control unit connector B (20P) and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom / indication goes away, replace the original climate control unit.
    2. NO  : Repair open in the wire between the climate control unit and the outside air temperature sensor.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.