DTC B13AF:62 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2008200

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

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

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT IF MALFUNCTION CAUSE IS START STOP UNIT OR FRONT BODY CONTROL MODULE (FBCM) • 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.
1		No	Go to the next step.
2	INSPECT LIGHT SWITCH • 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.)
2		No	Replace the light switch, then go to Step 7. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
3	INSPECT IF MALFUNCTION CAUSE IS FRONT BODY CONTROL MODULE (FBCM) OR WIRING HARNESS • 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.
3		No	Perform the CAN malfunction diagnosis flow and inspect the CAN for a malfunction. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (L.H.D.)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (R.H.D.)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [SKYACTIV-D 2.2 (L.H.D.)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [SKYACTIV-D 2.2 (R.H.D.)].) • 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	INSPECT FOR SHORT TO GROUND BETWEEN START STOP UNIT AND FRONT BODY CONTROL MODULE (FBCM) • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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 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.
4		No	Go to the next step.
5	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN START STOP UNIT AND FRONT BODY CONTROL MODULE (FBCM) • 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 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector 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	INSPECT FOR OPEN CIRCUIT BETWEEN START STOP UNIT AND FRONT BODY CONTROL MODULE (FBCM) • Verify that the front body control module (FBCM) and start stop unit connectors are disconnected. • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector 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	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • 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)].)
8		No	DTC troubleshooting completed.