Models Without Navigation System
- Turn ignition off. Disconnect ambient temperature sensor connector. See Figure . Turn ignition on. Measure voltage between ambient temperature sensor harness connector terminal No. 1 (Blue/Red wire) and ground. If about 5 volts are present, go to next step. If about 5 volts are not present, go to step 4 .
- Turn ignition off. Disconnect A/C auto amplifier harness connector. Check continuity of Green/White wire between A/C auto amplifier harness connector terminal No. 11 and ambient temperature sensor harness connector terminal No. 2. See Fig 1 . If continuity is present, go to next step. If continuity is not present, repair wiring harness or connector as necessary. See WIRING DIAGRAMS .
- Check ambient temperature sensor resistance. See AMBIENT TEMPERATURE SENSOR, INTAKE SENSOR & IN-VEHICLE TEMPERATURE SENSOR RESISTANCE table. If resistances are not to specification, replace ambient temperature sensor. If resistances are to specification, replace A/C auto amplifier. Perform self-diagnosis step 2 and ensure code No. 20 is displayed. See SELF-DIAGNOSIS STEP 2 under SELF-DIAGNOSTICS.
- Disconnect A/C auto amplifier harness connector. Check continuity of Blue/Red wire between A/C auto amplifier harness connector terminal No. 2 and ambient temperature sensor harness connector terminal No. 1. If continuity is present, replace A/C auto amplifier. Perform self-diagnosis step 2 and ensure code No. 20 is displayed. See SELF-DIAGNOSIS STEP 2 under SELF-DIAGNOSTICS. If continuity is not present, repair wiring harness or connectors as necessary. See WIRING DIAGRAMS .
AMBIENT TEMPERATURE SENSOR, INTAKE SENSOR & IN-VEHICLE TEMPERATURE SENSOR RESISTANCE
| Temperature - °F (°C) | Ohms |
|---|---|
| 5 (-15) | 12,730 |
| 14 (-10) | 9920 |
| 23 (-5) | 7800 |
| 32 (0) | 6190 |
| 41 (5) | 4950 |
| 50 (10) | 3990 |
| 59 (15) | 3240 |
| 68 (20) | 2650 |
| 77 (25) | 2190 |
| 86 (30) | 1810 |
| 95 (35) | 1510 |
| 104 (40) | 1270 |
| 113 (45) | 1070 |