SMART BRAKE SUPPORT (SBS) [REARWARD DETECTION] DOES NOT OPERATE [SMART BRAKE SUPPORT (SBS) [REARWARD DETECTION]]

id1503e1055200

Note

•  Due to environmental effects, the system behavior may differ from the driver’s intentions even though the vehicle has no malfunction. To perform symptom troubleshooting, an understanding of the applicable system from the service highlights/technical guide is required. For details on the control conditions of the system, refer to the [SMART BRAKE SUPPORT (SBS) [REARWARD DETECTION]] operation in the service highlights/technical guide.

Outline

Description	•  The brake does not operate when the brake should be operated.
Possible cause	•  Function temporarily disabled •  Scratches or dirt on rear ultrasonic sensor •  PCM malfunction •  Electronically controlled brake unit malfunction •  Rear ultrasonic sensor malfunction •  BCM malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ALL SYSTEM DTCs •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	Go to the next step.
2	VERIFY OPERATION RECORD •  Verify the operation record for the time period when the malfunction occurred. (See VEHICLE CONTROL MODULE (VCM) OPERATION RECORD.) •  Is the operation record to disable the applicable function displayed?	Yes	The system is normal. (Explain to the customer that the system was temporarily restricted.)
		No	Go to the next step.
3	VERIFY REAR ULTRASONIC SENSOR CONDITION •  Visually verify the applicable part. •  Are there any scratches or dirt?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
		No	Go to the next step.
4	INSPECT REAR ULTRASONIC SENSOR FOR MALFUNCTION •  Inspect the applicable part. (See REAR ULTRASONIC SENSOR INSPECTION.) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See REAR ULTRASONIC SENSOR REMOVAL/INSTALLATION [(E)].)
Repair completion verification	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction is not resolved, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)