HEXA

ELECTRICAL 338 BRAKE SWITCH The brake pedal is fitted with two Brake switches, which provide the information to ECU about the brake pedal application. • Upper brake switch give signal to EMS ECU for cruise control functionality. • Lower brake switch give signal to tail lamp& ABS/ESP ECU. NOTE  In case of DTCs related to brake switch in EMS ECU, Brake switch operation can be checked using Diagnostics tool.  'Safety (Redundant) switch' should turn ON first and then 'Main brake light switch'.  There is very little difference in operation of these two brake switches, hence need to checked carefully.  (Select 'Switch Test' subsection from drop down menu of Vehicle parameters in EMS ECU). LOCATION Brake switches are fitted on brake light switch mounting bracket. REMOVAL Disconnect electrical connections of brake light switch (1) and safety (Redundant) switch (2) (If fitted). Loosen the mounting nut of brake switch and take out the brake switch by rotating anticlockwise direction. INSPECTION Disconnect the connector and check the continuity between the following pins. When the pedal is depressed there should be connectivity and when it is released to rest position there should not be connectivity. Brake Light Switch: Pins 1 and 2 for Brake light circuit. Pins 3 and 4 for Brake signal to EMS circuit Brake switch for Cruise Pins 1 and 3 for Brake pedal signal for cruise control. For switch adjustment details, refer brake section. REFITMENT 1. Fit the brake light switch on the mounting bracket and tighten its mounting nut. NOTE Refer brake section for brake switch adjustment details.