Lexus ES: Fail-safe Chart
FAIL-SAFE CHART
PROTECTION FUNCTION
(a) The windshield wiper motor assembly operates the following protection functions if it detects an abnormal condition, in order to protect the wiper and washer system.
| Item | Protection Content | Conditions to Return to Normal Condition |
|---|---|---|
| Overheat protection | Decreases wiper operating speed in order to protect the windshield wiper motor assembly if the windshield wiper motor assembly temperature becomes excessively high.
| The windshield wiper motor assembly returns to normal. |
| Snow protection | Reverses the direction of the wipers and decreases their operating range when an excessive load, due to snow, etc., is detected near the extremities of the wiper operating range. In this case, operation is stopped at the lower reverse position for a certain period of time to prevent the motor from overheating. | Foreign matter, such as snow, is removed and the wiper operating range returns to normal. |
| Excessive load protection | Stops wiper operation when an excessive load is detected when the wipers are near the center of the wiper operating range. | The front wiper switch is turned off and then to any operating position. |
RAIN SENSOR FAIL-SAFE FUNCTION (w/ Auto Wiper System)
(a) The rain sensor performs fail-safe functions when it cannot properly receive necessary signals for wiper system control or a wiper system component is malfunctioning.
| Item | Fail-safe Function | Conditions to Return to Normal Condition |
|---|---|---|
| Rain sensor voltage is too low | Continues control according to the conditions detected before the malfunction | Rain sensor voltage returns to normal |
| The rain sensor temperature is excessively high (90°C (194°F) or higher) | Stops the wiper operation | Rain sensor returns to normal |
| The rain sensor temperature is excessively low (-15°C (5°F) or lower) | ||
| Rain sensor LIN communication error | LIN communication returns to normal | |
| Windshield wiper motor position signal error | Windshield wiper motor position signal returns to normal | |
| Abnormal rain sensor signal | Performs intermittent operation according to the position of the auto sensitivity adjustment switch | Rain sensor returns to normal |
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