Home

Mazdamanuals.com

DTC B1B57:49 [PARKING ASSIST UNIT (ULTRASONIC)]

id0902q9122400

Outline

System malfunction location

Malfunction in power supply to ultrasonic sensor

Detection condition

Note

•  DTC B1B57:49 is detected even if rear ultrasonic sensor-related malfunction occurred.

•  The parking assist unit (ultrasonic) detects that there is a malfunction in power supply to the ultrasonic sensor for 10 s.

Fail-safe

(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (E)].)

Possible cause

•  Front bumper malfunction

•  Parking assist unit (ultrasonic) connector or terminal malfunction

•  Front ultrasonic sensor connector or terminal malfunction

•  Short to ground in front ultrasonic sensor power supply circuit

•  Open circuit in front ultrasonic sensor power supply circuit

•  Front ultrasonic sensor malfunction

•  Parking assist unit (ultrasonic) malfunction

System malfunction location	Malfunction in power supply to ultrasonic sensor
Detection condition	Note • DTC B1B57:49 is detected even if rear ultrasonic sensor-related malfunction occurred. • The parking assist unit (ultrasonic) detects that there is a malfunction in power supply to the ultrasonic sensor for 10 s.
Fail-safe	(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (E)].)
Possible cause	• Front bumper malfunction • Parking assist unit (ultrasonic) connector or terminal malfunction • Front ultrasonic sensor connector or terminal malfunction • Short to ground in front ultrasonic sensor power supply circuit • Open circuit in front ultrasonic sensor power supply circuit • Front ultrasonic sensor malfunction • Parking assist unit (ultrasonic) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT PARKING ASSIST UNIT (ULTRASONIC) FOR MALFUNCTION

•  Perform the DTC inspection for the parking assist unit (ultrasonic).
(See DTC INSPECTION.)

•  Is a DTC related to an internal malfunction displayed? (U3000:04)

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (E)].)

No

Go to the next step.

2

VERIFY FRONT BUMPER EXTERNAL APPEARANCE AND INSTALLATION CONDITION

•  Verify the external appearance and installation condition of the applicable part.
(See FRONT BUMPER REMOVAL/INSTALLATION [(E)].)

•  Are the external appearance and the installation condition normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location, or install the applicable part correctly and perform the repair completion verification.

(See FRONT BUMPER REMOVAL/INSTALLATION [(E)].)

3

INSPECT PARKING ASSIST UNIT (ULTRASONIC) (TERMINAL 2A-2R) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

VERIFY PARKING ASSIST UNIT (ULTRASONIC) VOLTAGE

•  Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

•  Measure the voltage at parking assist unit (ultrasonic) terminal 2Q (part side).

•  Is the voltage normal?
(See PARKING ASSIST UNIT (ULTRASONIC) INSPECTION.)

Yes

Go to the next step.

No

Replace the parking assist unit (ultrasonic) and perform the repair completion verification.

(See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)

5

INSPECT FRONT ULTRASONIC SENSOR CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

6

VERIFY POWER SUPPLY VOLTAGE FROM PARKING ASSIST UNIT (ULTRASONIC)

•  Connect the parking assist unit (ultrasonic) connector.

•  Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

•  Measure the voltage at each front ultrasonic sensor terminal C (vehicle wiring harness side).

•  Is all the voltage normal?
(See PARKING ASSIST UNIT (ULTRASONIC) INSPECTION.)

Yes

Go to Step 9.

No

Go to the next step.

7

INSPECT FRONT ULTRASONIC SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

8

INSPECT FRONT ULTRASONIC SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

9

INSPECT FRONT ULTRASONIC SENSOR FOR MALFUNCTION

•  Connect the parking assist unit (ultrasonic) connector.

•  Perform the following procedure for each front ultrasonic sensor.

1.  Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

2.  If there is a connected front ultrasonic sensor connector, disconnect it.

3.  Connect any one of the front ultrasonic sensor connectors.

4.  Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

5.  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

6.  Perform the DTC inspection for the parking assist unit (ultrasonic).
(See DTC INSPECTION.)

7.  Verify if the same DTC is displayed.

•  Is the same Pending DTC present for all the sensors?

Yes

Note

•  If DTC B1B58:49 has been completed, go to the next step.

Rear ultrasonic sensor can be considered the cause.

Repair the malfunctioning location according to the DTC B1B58:49 troubleshooting.

(See DTC B1B58:49 [PARKING ASSIST UNIT (ULTRASONIC)].)

No

Repair or replace the sensor connected when the DTC is displayed, and perform the repair completion verification.

(See FRONT ULTRASONIC SENSOR REMOVAL/INSTALLATION.)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the parking assist unit (ultrasonic).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

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 [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the parking assist unit (ultrasonic), then go to the next step.
(See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT PARKING ASSIST UNIT (ULTRASONIC) FOR MALFUNCTION • Perform the DTC inspection for the parking assist unit (ultrasonic). (See DTC INSPECTION.) • Is a DTC related to an internal malfunction displayed? (U3000:04)	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (E)].)
1		No	Go to the next step.
2	VERIFY FRONT BUMPER EXTERNAL APPEARANCE AND INSTALLATION CONDITION • Verify the external appearance and installation condition of the applicable part. (See FRONT BUMPER REMOVAL/INSTALLATION [(E)].) • Are the external appearance and the installation condition normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location, or install the applicable part correctly and perform the repair completion verification. (See FRONT BUMPER REMOVAL/INSTALLATION [(E)].)
3	INSPECT PARKING ASSIST UNIT (ULTRASONIC) (TERMINAL 2A-2R) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	VERIFY PARKING ASSIST UNIT (ULTRASONIC) VOLTAGE • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Measure the voltage at parking assist unit (ultrasonic) terminal 2Q (part side). • Is the voltage normal? (See PARKING ASSIST UNIT (ULTRASONIC) INSPECTION.)	Yes	Go to the next step.
4		No	Replace the parking assist unit (ultrasonic) and perform the repair completion verification. (See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)
5	INSPECT FRONT ULTRASONIC SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	VERIFY POWER SUPPLY VOLTAGE FROM PARKING ASSIST UNIT (ULTRASONIC) • Connect the parking assist unit (ultrasonic) connector. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Measure the voltage at each front ultrasonic sensor terminal C (vehicle wiring harness side). • Is all the voltage normal? (See PARKING ASSIST UNIT (ULTRASONIC) INSPECTION.)	Yes	Go to Step 9.
6		No	Go to the next step.
7	INSPECT FRONT ULTRASONIC SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT FRONT ULTRASONIC SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT FRONT ULTRASONIC SENSOR FOR MALFUNCTION • Connect the parking assist unit (ultrasonic) connector. • Perform the following procedure for each front ultrasonic sensor. 1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) 2. If there is a connected front ultrasonic sensor connector, disconnect it. 3. Connect any one of the front ultrasonic sensor connectors. 4. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) 5. Clear the DTC recorded in the memory. (See CLEARING DTC.) 6. Perform the DTC inspection for the parking assist unit (ultrasonic). (See DTC INSPECTION.) 7. Verify if the same DTC is displayed. • Is the same Pending DTC present for all the sensors?	Yes	Note • If DTC B1B58:49 has been completed, go to the next step. Rear ultrasonic sensor can be considered the cause. Repair the malfunctioning location according to the DTC B1B58:49 troubleshooting. (See DTC B1B58:49 [PARKING ASSIST UNIT (ULTRASONIC)].)
9		No	Repair or replace the sensor connected when the DTC is displayed, and perform the repair completion verification. (See FRONT ULTRASONIC SENSOR REMOVAL/INSTALLATION.)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the parking assist unit (ultrasonic). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	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 [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the parking assist unit (ultrasonic), then go to the next step. (See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.