DTC C0023:62/C0040:64/C0040:86 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2860100

DTC	C0023:62, C0040:64, C0040:86		Brake light/Brake switch
DETECTION CONDITION		•  C0023:62 ―  Brake light ON signal is not input even though the brake light request signal is input. ―  Brake light ON signal is input even though the brake light request signal is not input. ―  Brake light ON signal is not input when the brake fluid pressure sensor signal reaches the specified value. ―  Communication error with brake light is detected in CAN communication via RBCM. •  C0040:64 ―  Brake switch ON signal is input for 15 min or more when driving at a vehicle speed of 15 km/h {9.3 mph} or more. •  C0040:86 ―  Communication error with brake switch is detected in CAN communication via PCM.
FAIL-SAFE FUNCTION		•  Refer to “Fail-safe Function Malfunction Contents”. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)
POSSIBLE CAUSE		•  Poor connection at connectors (female terminal) •  Open in wiring harness between the DSC HU/CM terminal AH and IG1 relay No.1 •  Short to power supply in the wiring harness between the following terminals: ―  Brake switch terminal D—PCM terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5) ―  Brake switch terminal D—PCM terminal 2G (SKYACTIV-G 2.5T) ―  Brake switch terminal D—PCM terminal 2U (SKYACTIV-D 2.2) •  Open circuit in wiring harness between the following terminals: ―  Brake switch terminal D—PCM terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5) ―  Brake switch terminal D—PCM terminal 2G (SKYACTIV-G 2.5T) ―  Brake switch terminal D—PCM terminal 2U (SKYACTIV-D 2.2) •  Brake switch malfunction •  Rear Body Control Module (RBCM) malfunction •  PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT POWER SUPPLY (SYSTEM) CIRCUIT •  Measure the voltage at the DSC HU/CM connector terminal AH (vehicle harness side) and body ground. ―  Ignition switch OFF: 1 V or less ―  Ignition switch ON (engine off): B+ •  Is the voltage normal?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between ignition switch and DSC HU/CM terminal AH (vehicle harness side). If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a open circuit. Go to Step 8.
2	VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL •  Measure the voltage between the PCM connector terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5)/2G (SKYACTIV-G 2.5T)/2U (SKYACTIV-D 2.2) (wiring harness-side) and body ground when the brake pedal is depressed and released. ―  Brake pedal depressed: B+ ―  Brake pedal released: 1 V or less •  Is the voltage normal?	Yes	Go to the Step 8.
		No	If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 4.
3	INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT •  Disconnect the brake switch connector. •  Measure voltage between the brake switch connector terminal D (wiring harness-side) and body ground. •  Is the voltage 1 V or less?	Yes	Go to Step 4.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  Brake switch terminal D—PCM terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5) •  Brake switch terminal D—PCM terminal 2G (SKYACTIV-G 2.5T) •  Brake switch terminal D—PCM terminal 2U (SKYACTIV-D 2.2) If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
4	INSPECT BRAKE SWITCH SIGNAL FOR OPEN CIRCUIT •  Disconnect the PCM connectors. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Brake switch terminal D—PCM terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5) ―  Brake switch terminal D—PCM terminal 2G (SKYACTIV-G 2.5T) ―  Brake switch terminal D—PCM terminal 2U (SKYACTIV-D 2.2) •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  Brake switch terminal D—PCM terminal 2AB (SKYACTIV-G 2.0, SKYACTIV-G 2.5) •  Brake switch terminal D—PCM terminal 2G (SKYACTIV-G 2.5T) •  Brake switch terminal D—PCM terminal 2U (SKYACTIV-D 2.2) If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 8.
5	INSPECT BRAKE SWITCH •  Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) •  Is the brake switch normal?	Yes	Go to the next step.
		No	Replace the brake switch, then go to Step 8. (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].) (See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
6	VERIFY REAR BODY CONTROL MODULE (RBCM) DTC •  Using the M-MDS, perform the rear body control module (RBCM) DTC inspection. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].) DTC troubleshooting completed, then go to Step 8.
		No	Go to the next step.
7	VERIFY PCM DTC •  Using the M-MDS, perform the PCM DTC inspection. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].) (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].) (See DTC TABLE [PCM (SKYACTIV-D 2.2)].) DTC troubleshooting completed, then go to the next step.
		No	Go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED •  Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DYNAMIC STABILITY CONTROL (DSC)].) •  Start the engine and drive the vehicle at 20 km/h {12 mph} or more. •  Gradually slow down and stop vehicle. •  Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)].) •  Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1.
		No	Go to the next step.
9	VERIFY NO DTC IS PRESENT •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)
		No	DTC troubleshooting completed.