| Table 1: | Ambient Air Temperature Sensor Resistance |
Diagnostic Aids
| • | An inaccurate temperature display indicates an abnormal resistance condition within the system. |
| • | For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
The following table will be used to measure the resistance of the sensor and compare it with the actual ambient temperature. The mirror's temperature accuracy should be within 5 degrees of the actual temperature. The actual temperature should not be taken from a radio station, a sign displaying the temperature, etc. A temperature measuring tool such as a thermometer should be used. Some temperature measuring tools may be within 5 degrees of the actual temperature. Make sure to consult the manufacturer for the accuracy of the tool. This comparison can make the mirror seem off by 5-10 degrees of the actual temperature when it is not.
°C | °F | Minimum Resistance K Ohms | Maximum Resistance K Ohms |
|---|---|---|---|
-35 | -31 | 234.81 | 250.59 |
-30 | -22 | 171.69 | 182.31 |
-25 | -13 | 126.82 | 133.99 |
-20 | -4 | 94.63 | 99.49 |
-15 | 5 | 71.30 | 74.58 |
-10 | 14 | 54.21 | 56.43 |
-5 | 23 | 41.48 | 43.17 |
0 | 32 | 32.00 | 33.31 |
5 | 41 | 24.96 | 25.83 |
10 | 50 | 19.61 | 20.19 |
15 | 59 | 15.49 | 15.94 |
20 | 68 | 12.31 | 12.67 |
25 | 77 | 9.85 | 10.12 |
30 | 86 | 7.96 | 8.15 |
35 | 95 | 6.45 | 6.61 |
40 | 104 | 5.27 | 5.39 |
45 | 113 | 4.32 | 4.42 |
50 | 122 | 3.56 | 3.64 |
55 | 131 | 2.95 | 3.02 |
60 | 140 | 2.46 | 2.52 |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Inside Rearview Mirror Schematics Connector End View Reference: Stationary Windows Connector End Views | |||
1 | Did you review the Automatic Day-Night Mirror Description and Operation? | Go to Step 2 | |
2 |
Important: Verify the J 33431-C resistance settings with a DMM. Disconnect one of the J 33431-C leads momentarily between the resistance settings in order to quickly update the temperature display.Does the mirror display the correct temperature? | Go to Step 5 | Go to Step 3 |
3 | Test the signal circuit of the ambient temperature sensor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 4 |
4 | Test the ground circuit of the ambient temperature sensor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the ambient temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the inside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the ambient temperature sensor. Refer to Ambient Air Temperature Sensor Replacement. Did you complete the replacement? | Go to Step 9 | -- |
8 | Replace the inside rearview mirror. Refer to Inside Rearview Mirror Replacement. Did you complete the replacement? | Go to Step 9 | -- |
9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
