Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code B: Outside Air Temperature Sensor
2004 Acura 3.5RLSECTION Code B: Outside Air Temperature Sensor
CAUTION:
To avoid damage to sensor, use an ohmmeter with a measuring current of one milliamp or less.
- Remove outside air temperature sensor. See OUTSIDE AIR TEMPERATURE SENSOR under REMOVAL & INSTALLATION. Measure resistance across sensor terminals. See OUTSIDE AIR TEMPERATURE SENSOR RESISTANCE table under COMPONENT TESTS. If resistance is within specifications, go to next step. If resistance is not as specified, replace sensor.
- Remove climate control unit and disconnect 8-pin and 20-pin harness connectors. See CLIMATE CONTROL UNIT under REMOVAL & INSTALLATION. Measure resistance between ground and terminal No. 5 (Brown/White wire) of climate control unit 20-pin harness connector. See Figure. If resistance is greater than 10 ohms, go to next step. If resistance is less than 10 ohms, repair short in wire between climate control unit, outside air temperature sensor, and gauge assembly. If wiring is okay, check for short in gauge assembly.
- Check for continuity between terminal No. 5 (Brown/White wire) of climate control unit 20-pin harness connector and terminal No. 2 of outside air temperature sensor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open in Brown/White wire.
- Check for continuity in Pink/Blue wire between terminal No. 2 of climate control unit 8-pin harness connector and terminal No. 1 of outside air temperature sensor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open in Pink/Blue wire.
- Check for loose wires or poor connections at climate control unit 8-pin and 20-pin harness connectors and outside air temperature sensor harness connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom does not exist after substituting known-good climate control unit, replace original climate control unit. See CLIMATE CONTROL UNIT under REMOVAL & INSTALLATION.
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.
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.