Turn signals cruise control and brake light quit
#1
05-18-2019, 04:38 PM
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Turn signals cruise control and brake light quit
Out riding today and noticed cruise control stopped working. Then turn signals quit. Then engine light come on. Finally got home snd had no brake lights from front or rear. Error code p0572. Replaced rear brake sensor last year. Any suggestions. 08 ultra classic. Thanks in advance
#2
05-18-2019, 05:35 PM
Seasoned HDF Member
P0572 is a brake switch code...
EDM.....
There are two stop lamp switches. The front stop lamp switch is a mechanical switch located on the right hand controls. The rear brake switch is a pressure switch located in the brake line under the exhaust pipes. On vehicles not equipped with Antilock Brake System (ABS), when the stop lamp switches are closed they supply power to the coil side of the brake relay. This energizes the brake relay and supplies power to the stop lamp. The stop lamp switches also supply an input to the ECM. On vehicles equipped with ABS, when the stop lamp switches are closed each switch supplies a separate input to the ABS module. Power is also supplied through the ABS diode pack to the ECM (as a brake input) and to the brake relay.The brake relay energizes and supplies power to the stop lamps. During an ignition cycle, the ECM must receive a valid brake switch input. Then during the same ignition cycle the vehicle has to reach 31 MPH (50 km/h) in third gear or higher and return to a stop three times with out any brake switch signals in order to set DTC P0572.
DTC DESCRIPTION P0572 Brake switch input error
DIAGNOSTICS Diagnostic Tips
• Check that the rear brake reservoir has the proper amount of brake fluid, and there are no apparent leaks. If fluid is low, the rear brake switch may not receive sufficient pressure to actuate the switch. Replenish brake fluid in the brake reservoir(s), as necessary.
• An intermittent may be caused by poor connection, rubbed through wire insulation or a wire broken inside the insulation.
Check for the following conditions:
• Poor connection: Inspect component and harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal- to-wire connection and damaged harnesses.
• Fluid leaks: Check the rear brake switch for fluid leaks around the seal of the switch. Refer to Service Manual to repair a fluid leak.
Diagnostic Notes
Each reference number below correlates to a circled number on the flow chart(s).
1. When checking the (O/W) wire, from the accessory fuse for a short to ground, remember to check the wires on the other side of the switches for shorts to ground as well. These circuits could cause a short to the accessory fuse but ONLY when the switch is closed. The accessory fuse circuit supplies power to the cigar lighter, horn, left and right turn signal switches, front and rear brake switches and the cruise control switch.
EDM.....
There are two stop lamp switches. The front stop lamp switch is a mechanical switch located on the right hand controls. The rear brake switch is a pressure switch located in the brake line under the exhaust pipes. On vehicles not equipped with Antilock Brake System (ABS), when the stop lamp switches are closed they supply power to the coil side of the brake relay. This energizes the brake relay and supplies power to the stop lamp. The stop lamp switches also supply an input to the ECM. On vehicles equipped with ABS, when the stop lamp switches are closed each switch supplies a separate input to the ABS module. Power is also supplied through the ABS diode pack to the ECM (as a brake input) and to the brake relay.The brake relay energizes and supplies power to the stop lamps. During an ignition cycle, the ECM must receive a valid brake switch input. Then during the same ignition cycle the vehicle has to reach 31 MPH (50 km/h) in third gear or higher and return to a stop three times with out any brake switch signals in order to set DTC P0572.
DTC DESCRIPTION P0572 Brake switch input error
DIAGNOSTICS Diagnostic Tips
• Check that the rear brake reservoir has the proper amount of brake fluid, and there are no apparent leaks. If fluid is low, the rear brake switch may not receive sufficient pressure to actuate the switch. Replenish brake fluid in the brake reservoir(s), as necessary.
• An intermittent may be caused by poor connection, rubbed through wire insulation or a wire broken inside the insulation.
Check for the following conditions:
• Poor connection: Inspect component and harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal- to-wire connection and damaged harnesses.
• Fluid leaks: Check the rear brake switch for fluid leaks around the seal of the switch. Refer to Service Manual to repair a fluid leak.
Diagnostic Notes
Each reference number below correlates to a circled number on the flow chart(s).
1. When checking the (O/W) wire, from the accessory fuse for a short to ground, remember to check the wires on the other side of the switches for shorts to ground as well. These circuits could cause a short to the accessory fuse but ONLY when the switch is closed. The accessory fuse circuit supplies power to the cigar lighter, horn, left and right turn signal switches, front and rear brake switches and the cruise control switch.
Last edited by dawg; 05-18-2019 at 05:37 PM.
#3
07-04-2019, 10:15 AM
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