Description

Light switch LO signal mismatch

Detection condition

• The condition in which the CAN and module signals are compared and no match is detected between the signals for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe function

• If DTC B13AF:62 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated.

• If DTC B13AF:62 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.

Possible cause

• Start stop unit malfunction

• Light switch malfunction

• Short to ground in wiring harness between start stop unit terminal 1X and front body control module (FBCM) terminal 2W

• Short to power supply in wiring harness between start stop unit terminal 1X and front body control module (FBCM) terminal 2W

• Open circuit in wiring harness between start stop unit terminal 1X and front body control module (FBCM) terminal 2W

• Front body control module (FBCM) malfunction

Step

Inspection

Action

1

• Display the start stop unit PID H/L_SW_LOW using the M-MDS.

  (See PID/DATA MONITOR INSPECTION [START STOP UNIT].)

• Verify the PID while operating the light switch.

• Is the PID displayed normally?

Yes

Go to Step 3.

No

Go to the next step.

2

• Inspect the light switch.

  (See LIGHT SWITCH INSPECTION.)

• Is the light switch normal?

Yes

Replace the start stop unit, then go to Step 7.

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Replace the light switch, then go to Step 7.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

3

• Display the front body control module (FBCM) PID H/L_SW_LOW1 using the M-MDS.

  (See PID/DATA MONITOR INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].)

• Verify the PID while operating the light switch.

• Is the PID displayed normally?

Yes

Go to the next step.

No

Perform the CAN malfunction diagnosis flow and inspect the CAN for a malfunction.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

• If there is no malfunction in the CAN, replace the front body control module (FBCM), then go to Step 7.

  (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

4

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Disconnect the front body control module (FBCM) connector.

• Disconnect the start stop unit connector.

• Inspect for continuity between front body control module (FBCM) terminal 2W (wiring harness-side) and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1X and front body control module (FBCM) terminal 2W.

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.

Go to Step 7.

No

Go to the next step.

5

• Verify that the front body control module (FBCM) and start stop unit connectors are disconnected.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Switch the ignition ON (engine off or on).

• Measure the voltage at the front body control module (FBCM) terminal 2W (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1X and front body control module (FBCM) terminal 2W.

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 7.

6

• Verify that the front body control module (FBCM) and start stop unit connectors are disconnected.

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Inspect for continuity between start stop unit terminal 1X (wiring harness-side) and front body control module (FBCM) terminal 2W (wiring harness-side).

• 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 start stop unit terminal 1X and front body control module (FBCM) terminal 2W.

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 the next step.

7

• Always reconnect all disconnected connectors.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Clear the front body control module (FBCM) DTCs using the M-MDS.

  (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].)

• Switch the ignition ON (engine off or on) and wait for 5 s or more.

• Retrieve the front body control module (FBCM) DTCs using the M-MDS.

  (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the front body control module (FBCM).

  (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

8

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)

No

DTC troubleshooting completed.