Code A: In-Car Temperature Sensor
WARNING: This page is about a different car, the 1999 Acura 3.0CL and 1999 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
To avoid damage to sensor, use an ohmmeter with a measuring current of one milliamp or less.
- Remove in-car temperature sensor. See IN-CAR TEMPERATURE SENSOR under REMOVAL & INSTALLATION. Measure resistance across sensor connector terminals. See IN-CAR TEMPERATURE SENSOR RESISTANCE table under TESTING. If resistance is not as specified, replace sensor.
- If resistance is within specifications, remove stereo. Disconnect climate control unit 20-pin connector. Check for continuity between ground and terminal No. 16 (Yellow/Red wire) of climate control unit 20-pin connector. See Figure . If continuity exists, repair shorted Yellow/Red wire between climate control unit and in-car temperature sensor.
- If continuity does not exist, check for continuity between climate control unit 20-pin connector terminal No. 16 and in-car temperature sensor Yellow/Red wire terminal. If continuity does not exist, repair open Yellow/Red wire between climate control unit and in-car temperature sensor.
- If continuity exists, check for continuity between climate control unit 20-pin connector terminal No. 12 (Yellow/Green) and in-car temperature sensor Yellow/Green wire terminal. If continuity does not exist, repair open Yellow/Green wire between climate control unit and in-car temperature sensor.
- If continuity exists, check for loose wires or poor connections at climate control unit 20-pin connector and in-car temperature sensor 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.