DTC B1A79:13 [REAR BODY CONTROL MODULE (RBCM)]

id0902p4015000

System malfunction location

Rear fog light circuit malfunction

Detection condition

•  Rear body control module (RBCM) detects open circuit in rear fog light circuit.

Fail-safe

—

Possible cause

•  Rear fog light connector or terminal malfunction

•  Rear fog light bulb malfunction

•  Open circuit in wiring harness between rear fog light terminal B and body ground

•  Rear body control module (RBCM) connector or terminal malfunction

•  Open circuit in wiring harness between rear body control module (RBCM) terminal 4Q and rear fog light terminal A

•  Rear body control module (RBCM) malfunction

System malfunction location	Rear fog light circuit malfunction
Detection condition	• Rear body control module (RBCM) detects open circuit in rear fog light circuit.
Fail-safe	—
Possible cause	• Rear fog light connector or terminal malfunction • Rear fog light bulb malfunction • Open circuit in wiring harness between rear fog light terminal B and body ground • Rear body control module (RBCM) connector or terminal malfunction • Open circuit in wiring harness between rear body control module (RBCM) terminal 4Q and rear fog light terminal A • Rear body control module (RBCM) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN • Clear rear body control module (RBCM) DTCs using the M-MDS. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Perform the DTC inspection for the rear body control module (RBCM) using the M-MDS. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is DTC B1A79:13 displayed?	Yes	Go to the next step.
1		No	Go to Step 8.
2	INSPECT REAR FOG LIGHT CONNECTOR • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the rear fog light 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.
2		No	Repair or replace the connector, then go to Step 7.
3	REAR FOG LIGHT BULB INSPECTION • Inspect the rear fog light bulb. • Is the rear fog light bulb normal?	Yes	Go to the next step.
3		No	Replace the rear fog light bulb, then go to Step 7. (See REAR FOG LIGHT BULB REMOVAL/INSTALLATION.)
4	INSPECT REAR FOG LIGHT GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the rear fog light connector is disconnected. • Inspect for continuity between rear fog light terminal B (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness which has an open circuit, then go to Step 7.
5	INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION • Disconnect the rear body control module (RBCM) 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.
5		No	Repair or replace the connector, then go to Step 7.
6	INSPECT REAR FOG LIGHT CIRCUIT FOR OPEN CIRCUIT • Verify that the rear body control module (RBCM) connector and rear fog light connector are disconnected. • Inspect the wiring harness for an open circuit between rear body control module (RBCM) terminal 4Q (vehicle wiring harness side) and rear fog light terminal A (vehicle wiring harness side). • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness which has an open circuit, then go to the next step.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear rear body control module (RBCM) DTCs using the M-MDS. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Perform the DTC inspection for the rear body control module (RBCM) using the M-MDS. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is DTC B1A79:13 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear body control module (RBCM), then go to the next step. (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
8		No	DTC troubleshooting completed.