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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (On-Board Diagnostic - Front Body Control Module (FBCM)) >> DTC B1D06-11; Turn Light (LH) Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN Yes Go to the next step.
No Go to Step 15.
2 DETERMINE MALFUNCTIONING LIGHT
  • Operate the turn switch to the LH position.
  • Are there any lights among the following which do not flash?
    • Front turn light (LH)
    • Side turn light (LH) (With side turn light)
      • Rear turn light (LH)
 Yes All lights do not flash:
  • Go to the next step.

    Front turn light (LH) do not flash:

  • Go to Step 4.

    Side turn light (LH) (With side turn light) and rear turn light (LH) do not flash:

  • Go to Step 8.
No Go to Step 14.
3 INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION Yes Go to Step 14.
No Repair or replace the connector, then go to Step 14.
4 INSPECT FRONT TURN LIGHT BULB (LH)
  • Inspect the front turn light bulb (LH).
  • Is the bulb normal?
 Yes Go to the next step.
No Replace the bulb, then go to Step 14.
(See FRONT TURN LIGHT BULB REMOVAL/INSTALLATION .)
5 INSPECT FRONT TURN LIGHT (LH) CONNECTOR CONDITION Yes Go to the next step.
No Repair or replace the connector, then go to Step 14.
6 INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION
  • 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 14.
7 INSPECT FOR SHORT TO GROUND IN FRONT TURN LIGHT (LH) CONTROL CIRCUIT
  • Verify that the front turn light (LH) and front body control module (FBCM) connectors are disconnected.
  • Inspect for continuity between front body control module (FBCM) terminal 2B (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 front turn light (LH) terminal A and front body control module (FBCM) terminal 2B.
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 14.
No Go to Step 14.
8 INSPECT REAR TURN LIGHT BULB (LH)
  • Inspect the rear turn light bulb (LH).
  • Is the rear turn light bulb (LH) normal?
 Yes Go to the next step.
No Replace the rear turn light bulb (LH), then go to Step 14.
(See REAR TURN LIGHT BULB REMOVAL/INSTALLATION .)
9 INSPECT REAR TURN LIGHT (LH) CONNECTOR CONDITION Yes With side turn light
  • Go to the next step.

    Without side turn light

  • Go to Step 13.
No Repair or replace the connector, then go to Step 14.
10 INSPECT POWER OUTER MIRROR (LH) CONNECTOR CONDITION
  • Disconnect the power outer mirror (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.
No Repair or replace the connector, then go to Step 14.
11 INSPECT SIDE TURN LIGHT (LH) Yes Go to the next step.
No Replace the power outer mirror (LH), then go to Step 14.
(See POWER OUTER MIRROR REMOVAL/INSTALLATION .)
(See SIDE TURN LIGHT REMOVAL/INSTALLATION .)
12 INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION
  • 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 14.
13 INSPECT FOR SHORT TO GROUND IN TURN LIGHT (LH) CONTROL CIRCUIT
  • Verify that the power outer mirror (LH) (With side turn light), rear turn light (LH) and front body control module (FBCM) connectors are disconnected.
  • Inspect for continuity between front body control module (FBCM) terminal 2D (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:
  • Rear turn light (LH) terminal A-Front body control module (FBCM) terminal 2D
  • Power outer mirror (LH) terminal E- Front body control module (FBCM) terminal 2D (With side turn light)

    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 the next step.
No Go to the next step.
14 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
15 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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