DTC C1126:11 [FRONT BODY CONTROL MODULE (FBCM)]

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2014 - Mazda6 - Body and Accessories

DTC C1126:11 [FRONT BODY CONTROL MODULE (FBCM)]


Description	Parking/front side marker light circuit malfunction
Detection condition	Front body control module (FBCM) detects a short to ground in the parking/front side marker light circuit with the ignition switched ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	Parking/front side marker/front turn light bulb (LH) malfunction (Without discharge headlight system) Front side marker/front turn light bulb (LH) malfunction (With discharge headlight system) Parking/front side marker/front turn light bulb (RH) malfunction (Without discharge headlight system) Front side marker/front turn light bulb (RH) malfunction (With discharge headlight system) Front body control module (FBCM) connector or terminal malfunction Front combination light (LH) connector or terminal malfunction Front combination light (RH) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Without discharge headlight system Front combination light (LH) terminal C—Front body control module (FBCM) terminal 1J Front combination light (RH) terminal C—Front body control module (FBCM) terminal 1J With discharge headlight system Front combination light (LH) terminal D—Front body control module (FBCM) terminal 1J Front combination light (RH) terminal D—Front body control module (FBCM) terminal 1J Parking light (LH) malfunction (With discharge headlight system)) Parking light (RH) malfunction (With discharge headlight system)) Front body control module (FBCM) malfunction

Diagnostic Procedure


Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) 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	Go to the next step.
1		No	Go to Step 11.
2	INSPECT PARKING/FRONT SIDE MARKER/FRONT TURN LIGHT BULB (LH) (WITHOUT DISCHARGE HEADLIGHT SYSTEM)/FRONT SIDE MARKER/FRONT TURN LIGHT BULB (LH) (WITH DISCHARGE HEADLIGHT SYSTEM) Inspect the following bulb. Parking/front side marker/front turn light bulb (LH) (Without discharge headlight system) Front side marker/front turn light bulb (LH) (With discharge headlight system) Is the bulb normal?	Yes	Go to the next step.
2		No	Replace the bulb, then go to Step 10. (See PARKING/FRONT SIDE MARKER/FRONT TURN LIGHT BULB REMOVAL/INSTALLATION [WITHOUT DISCHARGE HEADLIGHT SYSTEM].) (See FRONT SIDE MARKER/FRONT TURN LIGHT BULB REMOVAL/INSTALLATION [WITH DISCHARGE HEADLIGHT SYSTEM].)
3	INSPECT PARKING/FRONT SIDE MARKER/FRONT TURN LIGHT BULB (RH) (WITHOUT DISCHARGE HEADLIGHT SYSTEM)/FRONT SIDE MARKER/FRONT TURN LIGHT BULB (RH) (WITH DISCHARGE HEADLIGHT SYSTEM) Inspect the following bulb. Parking/front side marker/front turn light bulb (RH) (Without discharge headlight system) Front side marker/front turn light bulb (RH) (With discharge headlight system) Is the bulb normal?	Yes	Go to the next step.
3		No	Replace the bulb, then go to Step 10. (See PARKING/FRONT SIDE MARKER/FRONT TURN LIGHT BULB REMOVAL/INSTALLATION [WITHOUT DISCHARGE HEADLIGHT SYSTEM].) (See FRONT SIDE MARKER/FRONT TURN LIGHT BULB REMOVAL/INSTALLATION [WITH DISCHARGE HEADLIGHT SYSTEM].)
4	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR 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. 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.
4		No	Repair or replace the connector, then go to Step 10.
5	INSPECT FRONT COMBINATION LIGHT (LH) CONNECTOR Disconnect the front combination light (LH) 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 10.
6	INSPECT FRONT COMBINATION LIGHT (RH) CONNECTOR Disconnect the front combination light (RH) 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.
6		No	Repair or replace the connector, then go to Step 10.
7	INSPECT FOR SHORT TO GROUND IN PARKING/FRONT SIDE MARKER LIGHT CONTROL CIRCUIT Verify that the front body control module (FBCM), front combination light (LH) and front combination light (RH) connectors are disconnected. Inspect for continuity between front body control module (FBCM) terminal 1J (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 the following terminals: Without discharge headlight system Front combination light (LH) terminal C—Front body control module (FBCM) terminal 1J Front combination light (RH) terminal C—Front body control module (FBCM) terminal 1J With discharge headlight system Front combination light (LH) terminal D—Front body control module (FBCM) terminal 1J Front combination light (RH) terminal D—Front body control module (FBCM) terminal 1J 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 10.
7		No	Without discharge headlight system Go to Step 10. With discharge headlight system Go to the next step.
8	PERFORM DTC INSPECTION AND VERIFY PARKING LIGHT (LH) MALFUNCTION Always reconnect all disconnected connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) 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	Replace the front combination light (LH), then go to the next step. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
8		No	Go to Step 11.
9	PERFORM DTC INSPECTION AND VERIFY PARKING LIGHT (RH) MALFUNCTION Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) 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	Replace the front combination light (RH), then go to the next step. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
9		No	Go to Step 11.
10	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) 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.
10		No	Go to the next step.
11	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)].)
11		No	DTC troubleshooting completed.

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