DTC B14F1:16 [VEHICLE CONTROL MODULE]

id1502c5045900

Outline

System malfunction location

Front side radar sensor low power supply voltage input

Detection condition

•  The vehicle control module (VCM) detects that the front side radar sensor power supply circuit voltage is abnormally low for 15 s.

Fail-safe

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

Possible cause

•  DTCs are stored in the following modules.

―  PCM

―  DC-DC converter

•  Front side radar sensor (LH) connector or terminal malfunction

•  Front side radar sensor (RH) connector or terminal malfunction

•  IG1 relay No.1 malfunction

•  Short to ground or open circuit in IG1 relay No.1 power supply circuit

•  Short to ground in front side radar sensor (LH) or front side radar sensor (RH) power supply circuit

•  Open circuit in front side radar sensor (LH) or front side radar sensor (RH) power supply circuit

•  Lead-acid battery malfunction

•  Front side radar sensor (RH) malfunction

•  Front side radar sensor (LH) malfunction

•  Vehicle control module (VCM) malfunction (built into body control module (BCM))

System malfunction location	Front side radar sensor low power supply voltage input
Detection condition	• The vehicle control module (VCM) detects that the front side radar sensor power supply circuit voltage is abnormally low for 15 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)
Possible cause	• DTCs are stored in the following modules. ― PCM ― DC-DC converter • Front side radar sensor (LH) connector or terminal malfunction • Front side radar sensor (RH) connector or terminal malfunction • IG1 relay No.1 malfunction • Short to ground or open circuit in IG1 relay No.1 power supply circuit • Short to ground in front side radar sensor (LH) or front side radar sensor (RH) power supply circuit • Open circuit in front side radar sensor (LH) or front side radar sensor (RH) power supply circuit • Lead-acid battery malfunction • Front side radar sensor (RH) malfunction • Front side radar sensor (LH) malfunction • Vehicle control module (VCM) malfunction (built into body control module (BCM))

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY DTCs

•  Perform the DTC inspection for the following modules.
(See DTC INSPECTION.)

―  PCM

―  DC-DC converter

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (e-SKYACTIV)].)

(See DTC TABLE [DC-DC CONVERTER (e-SKYACTIV)].)

No

Go to the next step.

2

INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM).
(See DTC INSPECTION.)

•  Is a DTC related to an internal malfunction displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

3

INSPECT FRONT SIDE RADAR SENSOR (LH) 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

INSPECT FRONT SIDE RADAR SENSOR (RH) 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.

5

INSPECT IG1 RELAY No.1 FOR MALFUNCTION

•  Inspect the applicable part.
(See RELAY 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 RELAY LOCATION [(E)].)

6

INSPECT IG1 RELAY No.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the applicable circuit for a short to ground and 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.

7

INSPECT FRONT SIDE RADAR SENSOR (LH) AND FRONT SIDE RADAR SENSOR (RH) 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 harness or fuse and perform the repair completion verification.

8

INSPECT FRONT SIDE RADAR SENSOR (LH) AND FRONT SIDE RADAR SENSOR (RH) POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

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

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning harness or fuse and perform the repair completion verification.

9

INSPECT LEAD-ACID BATTERY FOR MALFUNCTION

•  Inspect the applicable part.
(See LEAD-ACID BATTERY 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 LEAD-ACID BATTERY RECHARGING.)

(See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)

10

INSPECT FRONT SIDE RADAR SENSOR FOR MALFUNCTION DEPENDING ON REPEATABILITY

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

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

•  Switch the main power ON (READY off or on) and wait for 15 s or more.

•  Perform the DTC inspection for the vehicle control module (VCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Go to the next step.

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(See TROUBLESHOOTING PROCEDURE [(E)].)

If DTC is displayed

•  Go to the next step.

If DTC is not displayed

•  Go to repair completion verification 2.

11

DETERMINE MALFUNCTIONING LOCATION

•  Reconnect all the disconnected connectors.

•  Connect the negative lead-acid battery terminal.
(See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Display the following PIDs using the M-MDS.
(See PID/DATA MONITOR INSPECTION.)

Front side radar sensor (LH)

―  VPWR

Front side radar sensor (RH)

―  VPWR

•  Is the voltage B+ or less?
(See FRONT SIDE RADAR SENSOR INSPECTION.)

Yes

Replace the front side radar sensor which the voltage is B+ or less and perform the repair completion verification.

(See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)

No

Replace the front side radar sensor (RH), then go to the next step.

(See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)

12

INSPECT FRONT SIDE RADAR SENSOR (LH) FOR MALFUNCTION DEPENDING ON REPEATABILITY

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

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

•  Switch the main power ON (READY off or on) and wait for 15 s or more.

•  Perform the DTC inspection for the vehicle control module (VCM).
(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 [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, replace the front side radar sensor (LH) and perform the repair completion verification.

(See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(See TROUBLESHOOTING PROCEDURE [(E)].)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  Go to repair completion verification 2.

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.)

•  Switch the main power ON (READY off or on) and wait for 15 s or more.

•  Perform the DTC inspection for the vehicle control module (VCM).
(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 [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 recurs, replace the body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) 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	VERIFY DTCs • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― PCM ― DC-DC converter • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (e-SKYACTIV)].) (See DTC TABLE [DC-DC CONVERTER (e-SKYACTIV)].)
1		No	Go to the next step.
2	INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM). (See DTC INSPECTION.) • Is a DTC related to an internal malfunction displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [VEHICLE CONTROL MODULE (E)].) (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
2		No	Go to the next step.
3	INSPECT FRONT SIDE RADAR SENSOR (LH) 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	INSPECT FRONT SIDE RADAR SENSOR (RH) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT IG1 RELAY No.1 FOR MALFUNCTION • Inspect the applicable part. (See RELAY INSPECTION.) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See RELAY LOCATION [(E)].)
6	INSPECT IG1 RELAY No.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the applicable circuit for a short to ground and open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT FRONT SIDE RADAR SENSOR (LH) AND FRONT SIDE RADAR SENSOR (RH) 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 harness or fuse and perform the repair completion verification.
8	INSPECT FRONT SIDE RADAR SENSOR (LH) AND FRONT SIDE RADAR SENSOR (RH) POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning harness or fuse and perform the repair completion verification.
9	INSPECT LEAD-ACID BATTERY FOR MALFUNCTION • Inspect the applicable part. (See LEAD-ACID BATTERY INSPECTION.) • Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See LEAD-ACID BATTERY RECHARGING.) (See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)
10	INSPECT FRONT SIDE RADAR SENSOR FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the main power ON (READY off or on) and wait for 15 s or more. • Perform the DTC inspection for the vehicle control module (VCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Go to the next step.
10		No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (See TROUBLESHOOTING PROCEDURE [(E)].) If DTC is displayed • Go to the next step. If DTC is not displayed • Go to repair completion verification 2.
11	DETERMINE MALFUNCTIONING LOCATION • Reconnect all the disconnected connectors. • Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Display the following PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION.) Front side radar sensor (LH) ― VPWR Front side radar sensor (RH) ― VPWR • Is the voltage B+ or less? (See FRONT SIDE RADAR SENSOR INSPECTION.)	Yes	Replace the front side radar sensor which the voltage is B+ or less and perform the repair completion verification. (See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)
11		No	Replace the front side radar sensor (RH), then go to the next step. (See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)
12	INSPECT FRONT SIDE RADAR SENSOR (LH) FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the main power ON (READY off or on) and wait for 15 s or more. • Perform the DTC inspection for the vehicle control module (VCM). (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 [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, replace the front side radar sensor (LH) and perform the repair completion verification. (See FRONT SIDE RADAR SENSOR REMOVAL/INSTALLATION.)
12		No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (See TROUBLESHOOTING PROCEDURE [(E)].) If DTC is displayed • Repeat the diagnosis from Step 1. If DTC is not displayed • Go to repair completion verification 2.
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.) • Switch the main power ON (READY off or on) and wait for 15 s or more. • Perform the DTC inspection for the vehicle control module (VCM). (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 [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 recurs, replace the body control module (BCM), then go to the next step. (See BODY CONTROL MODULE (BCM) 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.