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HS4 L
The gear controls do not respond
Check the operation of the deadman sensor
1
Perform a voltage test on the sensor
If the drive controls are unresponsive or malfunctioning, first verify that the deadman sensor is working properly by performing a voltage test on it with a multimeter.

2
Replace the sensor
If the multimeter doesn't detect voltage on the sensor, it's faulty and needs to be replaced.

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