SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R) DOES NOT OPERATE/OPERATES INCORRECTLY [SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R)]

id1503b1003600

Note
•  If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R)] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R)].)

Possible Causes

•  Malfunction in accessory part installed to vehicle
?  Trailer switch (option) malfunction
•  Rear bumper malfunction
•  Parking assist unit connector or terminal malfunction
•  Control inhibited due to inhibit/limit conditions
?  Short circuit to ground in parking assist unit terminal T-related circuit
?  Short circuit to ground in parking assist unit terminal R-related circuit
•  Parking assist unit malfunction
•  System temporarily restricted due to outside conditions
?  Driving on steep slope
?  Steering angle according to the customer's steering wheel operation is too wide.
•  TCM malfunction
•  System operation conditions are not met.
•  Rear ultrasonic sensor malfunction

System Wiring Diagram

ac9wzw00005222

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
Note
•  Due to the date of production, different message is shown on the display.
•  Verify that the warning is displayed in the multi-information display when the selector lever is in the R position.
?  SCBS Reverse malfunction
?  Smart City Brake Support Reverse Disabled
•  Is the warning displayed?
Yes
Perform an inspection referring to "WARNING IS DISPLAYED IN MULTI-INFORMATION DISPLAY WHEN SELECTOR LEVER IS IN R POSITION".
(See WARNING IS DISPLAYED IN MULTI-INFORMATION DISPLAY WHEN SELECTOR LEVER IS IN R POSITION [SMART CITY BRAKE SUPPORT [REVERSE] (SCBS R)].)
No
Go to the next step.
2
VERIFY ALL SYSTEM DTCs
•  Switch the ignition off.
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Perform a CMDTC self-test using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PARKING ASSIST UNIT].)
No
Go to the next step.
3
VERIFY IF ACCESSORY PART IS INSTALLED
•  Verify if the following accessory accessories are installed to the vehicle.
?  Trailer switch (option)
•  Is an accessory installed to the vehicle?
Yes
Go to the next step.
No
Go to Step 5.
4
VERIFY IF MALFUNCTIONING LOCATION IS ACCESSORY DEPENDING ON REPEATABILITY
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the connector of the following accessory part.
?  Trailer switch (option)
•  Connect the negative battery terminal.
•  Does the malfunction recur?
Yes
Go to the next step.
No
System is normal. (Explain to the customer that the malfunction occurred due to an accessory installed to the vehicle.)
5
VERIFY REAR BUMPER EXTERNAL APPEARANCE AND INSTALLATION CONDITION
•  Verify that the rear bumper external appearance and installation condition.
•  Are the rear bumper external appearance and installation condition normal?
Yes
Go to the next step.
No
Repair or replace the rear bumper.
(See REAR BUMPER REMOVAL/INSTALLATION.)
6
VERIFY IF SYSTEM IS PURSUANT TO INHIBIT/LIMIT CONDITIONS
•  Perform the malfunction diagnosis for the inhibit/limit conditions and verify if the system is pursuant to the inhibit/limit conditions.
•  Is there anything pursuant to the inhibit/limit conditions?
Yes
Perform malfunction diagnosis for inhibit/limit conditions.
(See PERFORM MALFUNCTION DIAGNOSIS FOR INHIBIT/LIMIT [PARKING ASSIST UNIT].)
No
Go to the next step.
7
INSPECT PARKING ASSIST UNIT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the parking assist unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
8
INSPECT ACCESSORY RELATED CIRCUIT FOR SHORT TO GROUND
•  Verify that the parking assist unit connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
?  Parking assist unit terminal T
?  Parking assist unit terminal R
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following circuits.
•  Parking assist unit terminal T-related circuit
•  Parking assist unit terminal R-related circuit
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 ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
No
Replace the parking assist unit.
(See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
9
VERIFY MALFUNCTION CONDITION
•  Verify with the customer the malfunction condition.
•  At the time of the malfunction, did the customer drive the vehicle under any of the following conditions?
?  Steep slope
?  Steering angle is wide (turn the steering wheel too far)
Yes
System is normal. (Explain to the customer that the system does not operate on steep slopes or if the steering angle is too wide.)
No
Go to the next step.
10
DETERMINE MALFUNCTION CAUSE
•  Using the M-MDS, display the following PIDs for the parking assist unit.
?  REVERSE_LMP (Back-up light illumination condition)
•  Does the selector lever position switch correctly in conjunction with the indicator?
Yes
Go to the next step.
No
Replace the TCM.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6A-EL, GW6AX-EL].)
11
INSPECT REAR ULTRASONIC SENSOR
•  Inspect the rear ultrasonic sensor.
•  Is the rear ultrasonic sensor normal?
Yes
System is normal. (Explain the operating conditions and non-operating conditions of the system to the customer.)
No
Replace the malfunctioning rear ultrasonic sensor.
(See REAR ULTRASONIC SENSOR REMOVAL/INSTALLATION.)