Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Fail-safe Chart
FAIL-SAFE CHART
AUTO WIPER FAIL-SAFE FUNCTION
(a) If the wiper system is malfunctioning, the windshield wiper motor and link assembly (wiper ECU) performs a fail-safe function to control the system.
| Item | Fail-Safe Function | Conditions to Return to Normal Condition |
|---|---|---|
| Overheat protection | Decreases wiper operating speed in order to protect the windshield wiper motor and link assembly if the windshield wiper motor and link assembly temperature becomes excessively high.
| The windshield wiper motor and link assembly returns to normal. |
| Snow protection | Reverses the direction of the wipers when an excessive load is detected near the extremities of the wiper operating range. | 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
(a) The windshield wiper switch assembly performs the fail-safe function when the wiper system cannot properly receive the 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 LIN communication error | Continues control according to the conditions detected before the malfunction | LIN communication returns to normal. |
| Rain sensor voltage is too low | Rain sensor voltage returns to normal. | |
| Abnormal rain sensor signal | Performs intermittent operation according to the position of the auto sensitivity adjustment switch. | The rain sensor returns to normal. |
| The rain sensor temperature is too high (90°C (194°F) or higher). | Stops the wiper operation | |
| The rain sensor temperature is too low (-15°C (5°F) or lower). |
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / (desired system) / ...
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a pa ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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