Land Rover Discovery Parking Brake Warning Light

U2002-13 – Switch general electric failure – circuit open

A fault code scan returned U2002-13, Switch general electric failure, circuit open. The serial data showed an error in the electric parking brake switch input, with no change in the readings when the switch was pressed or released. The switch itself operated smoothly, and there were no relevant technical bulletins. Using our scan tool, we were able to operate the parking brake and lock and unlock the rear wheels, but a handbrake calibration was unsuccessful. The rear parking brake motors showed no damage and the wiring at the ABS module looked fine, narrowing the cause down to the switch, the wiring or the ABS module. We removed the centre console to test the switch wiring and found a good ground, with power on three of the four wires but none on the fourth. Removing the airbox to reach the ABS module, we carried out resistance checks back to the switch and found one power supply wire giving an abnormal reading. After opening up the passenger footwell to reach the multi-plug connector, we confirmed the plug to switch side was fine, but there was high resistance between the ABS module and the multi-plug.