Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is output when failure of the jam protection limit switch circuit is detected.
The jam protection limit switch is built in the power window motor.
This switch is OFF when the window stays between the fully closed position and 4 mm under the full-closed position, and Rear LH Door ECU reads this signal.
DTC CONDITION DETECTION CHART
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B1237 | No change in limit switch more than 2.0 seconds even if operating glass down when limit switch is OFF (window glass is fully closed) |
|
HINT:
When the door ECU detects the condition that the power window is lowered to turn the limit switch from OFF to ON, this DTC is cleared.