Lining Wear Supply Wheel 3 : Short to battery
Check the cables and connectors from the lining wear sensor to the corresponding EPM (including check for chafing damage) for short circuits. Disconnect lining wear sensor from EPM. Measure the lining wear sensor supply externally with lining wear sensor supply deactivated and the voltage must be below 0.5V. If not replace EPM. Activate the lining wear supply and the value shall be within 4.5-5.5V. If not replace EPM. Disconnect also EPM from central ECU. Check resistance between voltage supply pin of wire to EPM and wire to lining wear sensor supply. If resistance is smaller than 200 kOhm then error is in the wiring.
What you'll see
No driver-visible symptom recorded.
System reaction
Lining wear control off. Lining Wear Warning Lamp.
Diagnostic depth
Monitored voltage is above 6V
Damage in the wiring and/or connectors between LWS and EPM, wiring shorted to EPM supply voltage, damaged EPM