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Diagnostic Procedure

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC B13FE:14 (FRONT BODY CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN 
 Yes Go to the next step.
No Go to Step 7.
2 INSPECT HEADLIGHT LO RELAY (RH) 
 Yes Go to the next step.
No Replace the headlight LO relay (RH), then go to Step 6.
(See RELAY LOCATION .)
3 INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR 
  • 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.
No Repair or replace the connector, then go to Step 6.
4 INSPECT FOR SHORT TO GROUND IN HEADLIGHT LO RELAY (RH) CONTROL CIRCUIT 
  • Verify that the headlight LO relay (RH) is removed.
  • Verify that the front body control module (FBCM) connector is disconnected.
  • Inspect for continuity between front body control module (FBCM) terminal 2V (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 headlight LO relay (RH) terminal E and front body control module (FBCM) terminal 2V.
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 6.
No Go to the next step.
5 INSPECT FOR OPEN CIRCUIT IN HEADLIGHT LO RELAY (RH) CONTROL CIRCUIT 
  • Verify that the headlight LO relay (RH) is removed.
  • Verify that the front body control module (FBCM) connector is disconnected.
  • Inspect the wiring harness for continuity between headlight LO relay (RH) terminal E (wiring harness-side) and front body control module (FBCM) terminal 2V (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 headlight LO relay (RH) terminal E and front body control module (FBCM) terminal 2V.
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.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED 
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
7 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)] .)
No DTC troubleshooting completed.
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