Possible causes of fault

'Short circuit to B+' between 'PWM (Pulse Width Modulation) switch' and 'selector switch (in running gear control module)'
'Short circuit to ground' between 'PWM (Pulse Width Modulation) switch' and 'selector switch (in running gear control module)'
'Open circuit' between 'PWM (Pulse Width Modulation) switch' and 'selector switch (in running gear control module)'